From owner-molec-model@net.bio.net Sun Nov 01 22:00:00 1998
Path: biosci!DIHT.COM.SG!huadaime48
From: huadaime48@DIHT.COM.SG (frezxery)
Newsgroups: bionet.molec-model
Subject: Reach your internet clients - before competition
Date: 2 Nov 1998 09:00:54 -0800
Organization: BIOSCI International Newsgroups for Molecular Biology
Lines: 33
Sender: daemon@net.bio.net
Distribution: world
Message-ID: <199811021315SAA53987@frebrequaz.ghyis2.com.tw>
NNTP-Posting-Host: net.bio.net

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From owner-molec-model@net.bio.net Thu Nov 05 22:00:00 1998
Path: biosci!WALLSTREET10000.COM!begu10
From: begu10@WALLSTREET10000.COM (kikiolp)
Newsgroups: bionet.molec-model
Subject: Maximum Internet Presence - how to do it
Date: 6 Nov 1998 03:03:47 -0800
Organization: BIOSCI International Newsgroups for Molecular Biology
Lines: 35
Sender: daemon@net.bio.net
Distribution: world
Message-ID: <199811061183LAA50883@colslw.gds4f.pa>
NNTP-Posting-Host: net.bio.net

 To be removed, reply with the word "delete" in subject area.
 
  
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From owner-molec-model@net.bio.net Sat Nov 07 22:00:00 1998
Path: biosci!AOL.COM!Cutegirl21
From: Cutegirl21@AOL.COM
Newsgroups: bionet.molec-model
Subject: WANT A NEW CELL PHONE?  YOU'RE APPROVED!
Date: 8 Nov 1998 00:24:56 -0800
Organization: BIOSCI International Newsgroups for Molecular Biology
Lines: 42
Sender: daemon@net.bio.net
Distribution: world
Message-ID: <29af5527.36455322@aol.com>
NNTP-Posting-Host: net.bio.net

This is a multi-part message in MIME format.

--part0_910512932_boundary
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From: Cutegirl21@aol.com
Return-path: <Cutegirl21@aol.com>
To: Cutegirl21@aol.com
Subject: cellad
Date: Sun, 8 Nov 1998 00:04:43 EST
Mime-Version: 1.0
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7bit

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--part0_910512932_boundary--

From owner-molec-model@net.bio.net Mon Nov 09 22:00:00 1998
Path: biosci!juno.com!sndmalzzz
From: sndmalzzz@juno.com
Newsgroups: bionet.molec-model
Subject: 735 Engines $35
Date: 9 Nov 1998 23:51:52 -0800
Organization: BIOSCI International Newsgroups for Molecular Biology
Lines: 51
Sender: daemon@net.bio.net
Distribution: world
Message-ID: <199811100751.XAA14121@net.bio.net>
Reply-To: sndmalzzz@juno.com
NNTP-Posting-Host: net.bio.net

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From owner-molec-model@net.bio.net Tue Nov 10 22:00:00 1998
Path: biosci!news.stanford.edu!newsfeed.berkeley.edu!btnet-peer!btnet!nntp.news.xara.net!xara.net!server6.netnews.ja.net!daresbury!not-for-mail
From: BEEASYE@aol.com
Newsgroups: bionet.molec-model
Subject: HEAVY DUTY SEWING MACHINE SALE !!
Date: 11 Nov 1998 22:11:01 -0000
Organization: Daresbury Laboratory, Warrington, U.K.
Lines: 101
Message-ID: <72d21l$sj3$1@mserv2.dl.ac.uk>
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This is a multi-part message in MIME format.

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From: BEEASYE@aol.com
Return-path: <BEEASYE@aol.com>
To: BEEASYE@aol.com
Subject: f
Date: Wed, 11 Nov 1998 15:38:41 EST
Mime-Version: 1.0
Content-type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7bit

This is a 1 Time Mailing

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</PRE></HTML>

--part0_910817165_boundary--

From owner-molec-model@net.bio.net Tue Nov 10 22:00:00 1998
Path: biosci!news.stanford.edu!newsfeed.berkeley.edu!btnet-peer!btnet!nntp.news.xara.net!xara.net!server6.netnews.ja.net!daresbury!not-for-mail
From: NIEMAN60@aol.com
Newsgroups: bionet.molec-model
Subject: Photo Mousepads...........Great Gifts !
Date: 11 Nov 1998 08:13:06 -0000
Organization: Daresbury Laboratory, Warrington, U.K.
Lines: 160
Message-ID: <72bgui$hvh$1@mserv2.dl.ac.uk>
NNTP-Posting-Host: mserv2.dl.ac.uk
content-length: 3698
Return-Path: <NIEMAN60@aol.com>
Apparently-To: <molmodel@aol.com>



GREAT CHRISTMAS GIFT IDEA!


PHOTO TRANSFER SPECIALTIES! 


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Photo mousepads are our most popular gift year after year! 
In the past we have provided our HIGH QUALITY mousepads to 
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Replace boring, dirty, frayed mousepads! 
Instead of plain, generic, boring corporate logos you can 
have PERSONALIZED photo mousepads brighten your desktop!



PHOTO Mousepads are DAILY REMINDERS of your favorite:

                
CHILDREN, PETS, EVENTS.......

WEDDING PHOTOS, FAMILY, GRADUATION.....

LOVED ONES,HOLIDAY PHOTOS,GRANDCHILDREN.....

Anything you choose!   Use your imagination!
  

These HIGH QUALITY,LONG LASTING mousepads are non-skid 
1/4" rubber bottoms with comfortable, washable cloth tops.


PHOTO TRANSFER SPECIALTIES uses the latest technology 
available to transfer your favorite  3x5,4x6,5x7,and 8x10  photos
onto mousepads. Your photos will be safely RETURNED with your order!


This year we are offering a great new LOW PRICE and we are
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and money orders!

ORDERS filled FAST and at a great new LOW PRICE!



                         EASY   ORDER   FORM


       Please complete and   PRINT  this form. Mail your
       photograph(s), payment, and completed order form to 
       the address below along with:

       ______Check   or  _____ Money Order   

       Payable to: PHOTO TRANSFER SPECIALTIES


       Or pay by VISA or MASTERCARD by filling 
       out this CONVENIENT order form!


                ____   VISA       ____ MASTERCARD
  
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        Name on card: _________________________________
        
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                                 ________________________________
 
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        Date: __________________________________________
        Email address (optional):__________________________
      

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Phone #    ____________________________________

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Mail Payment, Photographs, and completed order form to:

PHOTO TRANSFER SPECIALTIES
P.O. BOX #782
ROSS, CA
94957




*  Please allow 2 weeks for delivery.

*  All orders postmarked by December 10th 
   are guaranteed Christmas delivery!

*  Please feel free to copy and distribute this order form as you 
   like. Combine your order with friends and coworkers and save 
   $1.00 on each additional mousepad.












This is a one time only mailing!  You have already 
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Thank
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From owner-molec-model@net.bio.net Wed Nov 11 22:00:00 1998
Path: biosci!news.stanford.edu!newsfeed.berkeley.edu!newsfeed.tli.de!newsfeed.wirehub.nl!oleane!jussieu.fr!univ-lille1.fr!not-for-mail
From: "Philippe CHAVATTE" <pchavatt@phare.univ-lille2.fr>
Newsgroups: bionet.molec-model
Subject: Bay-12-9566
Date: Thu, 12 Nov 1998 17:57:24 +0100
Organization: Universite des Sciences et Technologies de LILLE, France
Lines: 18
Message-ID: <72f422$vs3$1@netserv.univ-lille1.fr>
NNTP-Posting-Host: icp16.univ-lille2.fr
X-Newsreader: Microsoft Outlook Express 4.72.2106.4
X-MimeOLE: Produced By Microsoft MimeOLE V4.72.2106.4

Where can I find chemical structure of Bay-12-9566 ?
Thanks in advance

P. CHAVATTE

-----------------

Philippe CHAVATTE
Institut de Chimie Pharmaceutique de Lille
BP 83
59006 LILLE CEDEX
FRANCE

E-Mail : pchavatt@phare.univ-lille2.fr





From owner-molec-model@net.bio.net Thu Nov 19 22:00:00 1998
Path: biosci!news.stanford.edu!newsfeed.berkeley.edu!pln-w!spln!extra.newsguy.com!newsp.newsguy.com!mryan
From: mryan@worthpub.com (Mo)
Newsgroups: bionet.molec-model
Subject: Structure for ATP:hexokinase?
Date: Thu, 19 Nov 1998 23:49:01 -0500
Organization: http://extra.newsguy.com
Lines: 8
Message-ID: <mryan-1911982349020001@cc536452-a.ewndsr1.nj.home.com>
NNTP-Posting-Host: p-677.newsdawg.com
X-Newsreader: MT-NewsWatcher 2.4.4

I'm trying to inspect the surface contacts of ATP binding to hexokinase
for a detailed illustration. The released pdb structures have glucose
bound, but no ATP. How can I get detailed visual information about this?
Would comparing to an ATP-binding family homolog be accurate enough? Is
that the best technique? I'm hoping there is another option, because I'm
not sure how to manage the superposition--but maybe this is the project
where I learn how.
   Any help appreciated. Does a pdb of hexokinase:ATP exist? Morgan

From owner-molec-model@net.bio.net Sun Nov 22 22:00:00 1998
Newsgroups: bionet.molec-model
Path: biosci!news.stanford.edu!su-news-feed2.bbnplanet.com!su-news-hub1.bbnplanet.com!cpk-news-hub1.bbnplanet.com!news.gtei.net!newsfeed.cwix.com!194.72.7.126!btnet-peer!btnet!nntp.news.xara.net!xara.net!server6.netnews.ja.net!leeds.ac.uk!news
From: bmbjmm@bmb.leeds.ac.uk (Jeremy Murray)
Subject: Re: PDB files & CHIME
X-Accept-Language: en
Message-ID: <3659E5C6.CF925034@bmb.leeds.ac.uk>
NNTP-Posting-Host: bmbsgi15.leeds.ac.uk
X-Mailer: Mozilla 4.5 [en] (X11; I; IRIX 6.2 IP22)
Content-Type: text/plain; charset=us-ascii
Organization: University of Leeds
MIME-Version: 1.0
Date: Mon, 23 Nov 1998 22:56:55 +0000 (GMT)
References: <nna-ya02408000R2311981157150001@news>
To: "A.J.Cann" <nna@le.ac.uk>
Lines: 48
Content-Transfer-Encoding: 7bit

i guess your first port of call is the cam cryst database

http://www.ccdc.cam.ac.uk/

and then maybe HICUP

http://alpha2.bmc.uu.se/hicup/

happy hunting

"A.J.Cann" wrote:

> I have been trying to find PDB files of several molecules for use with the
> CHIME plugin in a new online tutorial:
>
> http://www-micro.msb.le.ac.uk/Tutorials/dfwt/dfwt1.html
>
> I would like to find information for:
>
> sulphonamide
> p-aminobenzoic acid
> folic acid
>
> Can anyone tell me where to find thes files or how to construct them?
>
> TIA,
>
> --
> Dr Alan J. Cann  PhD,   Department of Microbiology & Immunology,
> University of Leicester,  P.O. Box 138,  Medical Sciences Building,
> University Road, Leicester LE1 9HN,  UK.

--
.   .-. .-.   .-. .-.   .-. .-.   .-. .-.   .-. .-.   .-. .-.   .-. .-
|\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X||
||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|
-' `-'   `-' `-'   `-' `-'   `-' `-'   `-' `-'   `-' `-'   `-' `-'   `
Jeremy Murray                            MAIL: bmbjmm@bmb.leeds.ac.uk
Biochemistry & Molecular Biology         TEL:  +44 113 233 2591
Leeds University, LEEDS LS2 9JT          FAX:  +44 113 233 3167
        http://www.smb.leeds.ac.uk/wwwsb/jez.html
.   .-. .-.   .-. .-.   .-. .-.   .-. .-.   .-. .-.   .-. .-.   .-. .-
|\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X|||\ /|||X||
||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|||X|||/ \|
-' `-'   `-' `-'   `-' `-'   `-' `-'   `-' `-'   `-' `-'   `-' `-'   `




From owner-molec-model@net.bio.net Sun Nov 22 22:00:00 1998
Path: biosci!agate!newsfeed.berkeley.edu!nntp.abs.net!cyclone.i1.net!uunet!in5.uu.net!news1-gui.server.ntli.net!news-feed.ntli.net!news5-gui.server.ntli.net!news-feed.ntli.net!server4.netnews.ja.net!server2.netnews.ja.net!leicester!nna
From: nna@le.ac.uk (A.J.Cann)
Newsgroups: bionet.molec-model
Subject: PDB files & CHIME
Date: Mon, 23 Nov 1998 11:57:15 +0000
Organization: University of Leicester, UK
Lines: 19
Message-ID: <nna-ya02408000R2311981157150001@news>
NNTP-Posting-Host: mac47.msb.le.ac.uk
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
X-Newsreader: Yet Another NewsWatcher 2.4.0

I have been trying to find PDB files of several molecules for use with the
CHIME plugin in a new online tutorial:

http://www-micro.msb.le.ac.uk/Tutorials/dfwt/dfwt1.html

I would like to find information for:

sulphonamide
p-aminobenzoic acid
folic acid

Can anyone tell me where to find thes files or how to construct them?

TIA,

-- 
Dr Alan J. Cann  PhD,   Department of Microbiology & Immunology,
University of Leicester,  P.O. Box 138,  Medical Sciences Building,
University Road, Leicester LE1 9HN,  UK.

From owner-molec-model@net.bio.net Mon Nov 23 22:00:00 1998
Path: biosci!AOL.COM!GIDGE1026
From: GIDGE1026@AOL.COM
Newsgroups: bionet.molec-model
Subject: Photo Mouse Pads  .........  Great Christmas Gifts !
Date: 24 Nov 1998 00:25:42 -0800
Organization: BIOSCI International Newsgroups for Molecular Biology
Lines: 149
Sender: daemon@net.bio.net
Distribution: world
Message-ID: <901733a5.365a5b33@aol.com>
NNTP-Posting-Host: net.bio.net



GREAT CHRISTMAS GIFT IDEA!

PHOTO TRANSFER SPECIALTIES! 

MOUSEPADS WITH YOUR FAVORITE PHOTOS!


Now you can have your favorite photos printed onto mousepads!
Photo mousepads are our most popular gift year after year! 
In the past we have provided our HIGH QUALITY mousepads to 
thousands of customers. Most are so pleased they reorder
each year! 

Photo mousepads make a PERFECT GIFT for ANYONE! 

Replace boring, dirty, frayed mousepads! 
Instead of plain, generic, boring corporate logos you can 
have PERSONALIZED photo mousepads brighten your desktop!



PHOTO Mousepads are DAILY REMINDERS of your favorite:

                
CHILDREN, PETS, EVENTS.......

WEDDING PHOTOS, FAMILY, GRADUATION.....

LOVED ONES,HOLIDAY PHOTOS,GRANDCHILDREN.....

Anything you choose!   Use your imagination!
  

These HIGH QUALITY,LONG LASTING mousepads are non-skid 
1/4" rubber bottoms with comfortable, washable cloth tops.


PHOTO TRANSFER SPECIALTIES uses the latest technology 
available to transfer your favorite  3x5,4x6,5x7,and 8x10  photos
onto mousepads. Your photos will be safely RETURNED with your order!


This year we are offering a great new LOW PRICE and we are
accepting CONVENIENT credit card payment as well as checks 
and money orders!

ORDERS filled FAST and at a great new LOW PRICE!



                         EASY   ORDER   FORM


       Please complete and   PRINT  this form. Mail your
       photograph(s), payment, and completed order form to 
       the address below along with:

       ______Check   or  _____ Money Order   

       Payable to: PHOTO TRANSFER SPECIALTIES


       Or pay by VISA or MASTERCARD by filling 
       out this CONVENIENT order form!


                ____   VISA       ____ MASTERCARD
  
        Card number: __________________________________  (16 Digits)
        Expiration Date:    ______________________________
        Name on card: _________________________________
        
        Billing Address:  ________________________________
                                 ________________________________
 
        Indicate amount:   _______________________________
        
        Signature   :   ___________________________________
        Date: __________________________________________
        Email address (optional):__________________________
      

CREDIT CARDS :  All information must be accurate and complete for
                            proper verification. Incomplete orders cannot be
                            processed and will be returned. Charges on your 
                            statement will appear as Pacific Coast Mail Order.

       
        $ 10.99 EACH    Photo Mousepads
        $  9.99 EACH     Additional Pads
        $  2.50 EACH     Shipping and Handling  EACH MOUSEPAD 
        $  1.05 EACH     California residents (sales tax)
	                       
    ************ International EXTRA $5.00 EACH MOUSEPAD for  shipping
*********


        Address Mousepads to be shipped to:


Name:      ____________________________________

Address:   ____________________________________

Phone #    ____________________________________

City,State,Zip_________________________________



Mail Payment, Photographs, and completed order form to:

PHOTO TRANSFER SPECIALTIES
P.O. BOX #782
ROSS, CA
94957




*  Please allow 2 weeks for delivery.

*  All orders postmarked by December 10th 
   are guaranteed Christmas delivery!

*  Please feel free to copy and distribute this order form as you 
   like. Combine your order with friends and coworkers and save 
   $1.00 on each additional mousepad.




This is a one time only mailing!  You have already 
been placed on our remove list and will not receive
another offer from us! 

Thank
   You!








  

From owner-molec-model@net.bio.net Mon Nov 23 22:00:00 1998
Date: Tue, 24 Nov 1998 01:37:51 +0100
From: dumbo@xray.bmc.uu.se (Dombo Journal (Est. 1893))
Newsgroups: bionet.molec-model
Subject: Re: PDB files & CHIME
Message-ID: <dumbo-2411980137510001@nostromo.bmc.uu.se>
References: <nna-ya02408000R2311981157150001@news>
Organization: Molecular Biology, Uppsala University
X-Newsreader: Value-Added NewsWatcher 2.1d3+
NNTP-Posting-Host: nostromo.bmc.uu.se
X-Trace: 24 Nov 1998 01:38:23 +0100, nostromo.bmc.uu.se
Lines: 24
Path: biosci!agate!newsfeed.berkeley.edu!howland.erols.net!newsfeed1.telenordia.se!newsfeed.sunet.se!news01.sunet.se!news99.sunet.se!newsfeed.uu.se!nostromo.bmc.uu.se!user

In article <nna-ya02408000R2311981157150001@news>, nna@le.ac.uk (A.J.Cann)
wrote:

;->I have been trying to find PDB files of several molecules for use with the
;->CHIME plugin in a new online tutorial:
;->
;->http://www-micro.msb.le.ac.uk/Tutorials/dfwt/dfwt1.html
;->
;->I would like to find information for:
;->
;->sulphonamide
;->p-aminobenzoic acid
;->folic acid
;->
;->Can anyone tell me where to find thes files or how to construct them?

try the HIC-Up site at: http://alpha2.bmc.uu.se/hicup/

--cd
-----------------------------------------------------------
Gerard J. Kleywegt
Department of Molecular Biology, Biomedical Centre,
Uppsala University, Uppsala, SWEDEN
mailto:gerard@xray.bmc.uu.se *** http://alpha2.bmc.uu.se/usf/

From owner-molec-model@net.bio.net Mon Nov 23 22:00:00 1998
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From: nna@le.ac.uk (A.J.Cann)
Newsgroups: bionet.molec-model
Subject: Re: PDB files & CHIME
Date: Tue, 24 Nov 1998 12:34:35 +0000
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In article <nna-ya02408000R2311981157150001@news>, nna@le.ac.uk (A.J.Cann)
wrote:

>I have been trying to find PDB files of several molecules for use with the
>CHIME plugin in a new online tutorial:
>http://www-micro.msb.le.ac.uk/Tutorials/dfwt/dfwt1.html
>I would like to find information for:
>sulphonamide
>p-aminobenzoic acid
>folic acid
>Can anyone tell me where to find thes files or how to construct them?

Many thanks to all those who replied. Summary of responses:

Jeffrey Atkinson <jatkin@spartan.ac.brocku.ca>
Try the Klotho database at http://www.ibc.wustl.edu/klotho/.  All
kinds of stuff here including the thing at least the folate that you are
looking for.  They don't have sulphonamide or PABA, but these can be easily
drawn with one of the structure packages such as ChemDraw or IsisDraw,
Spartan or Hyperchem.  The 2D IsisDraw is free on the net but does not have
3D capability.

John Osborn <j.c.osborn@Bradford.ac.uk>
If the crystal structures of these compounds have been published
they will almost certainly be in the Cambridge Crystallographic
Database. Since you are at a British university you are entitled to
register to use this database free of charge through the Daresbury
Chemical Database Service. For details see
http://www.dl.ac.uk/CDS/cds.html
The structure files you can download from the database will not be
in PDB format, but if you need this format you can probably convert
them using the free molecular data format conversion program called
BABEL, available from
ftp://ccl.osc.edu/pub/chemistry/software/MAC/babel/
There may also be data format conversion software available on the
Daresbury Chemical Database Service - I am not sure about this.

Kenward Vaughan<kaynjay@igalaxy.net>
Have you visited the following?
http://www.sci.ouc.bc.ca/chem//molecule/molecule.html
http://www.ibc.wustl.edu/moirai/klotho/
http://ourworld.compuserve.com/homepages/JDebord/models.htm
    (last one has some other links, too)
    and a place of links I just ran across, but don't know about currency:
http://sch-www.uia.ac.be/u/thys/chem.html

Jeremy Murray <bmbjmm@bmb.leeds.ac.uk>
I guess your first port of call is the cam cryst database
http://www.ccdc.cam.ac.uk/
and then maybe HICUP
http://alpha2.bmc.uu.se/hicup/

Lynda Ellis <lynda@email.labmed.umn.edu>
I enjoyed looking at your tutorial.  One place to look for pdb files would be
the ChemFinder Webserver, http://chemfinder.camsoft.com/
I did not find a pbd file for sulphonamide when I looked there, but
there was a link to the ChemSymphony site, where the chemical was
the molecule of the month for February 1998.
http://www.chemsymphony.com/gallery/html/sulfanil.html
If you have the SMILES string for a compound or draw it using their editor,
CORINA will produce a pdb file for you on the web (for at least the first
1000 compounds):
http://www2.ccc.uni-erlangen.de/software/corina/index.html

-- 
Dr Alan J. Cann  PhD,   Department of Microbiology & Immunology,
University of Leicester,  P.O. Box 138,  Medical Sciences Building,
University Road, Leicester LE1 9HN,  UK.

From owner-molec-model@net.bio.net Thu Nov 26 22:00:00 1998
Path: biosci!internet!biosci!not-for-mail
From: biohelp (BIOSCI Administrator)
Newsgroups: bionet.molec-model
Subject: BIOSCI/bionet miniFAQ & Fundraiser
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	Contents:
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	0) BIOSCI NEEDS YOUR SUPPORT!!

	1) Using the WWW to access the BIOSCI/bionet newsgroups.

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	4) The BIOSCI user address and research interest directory.


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1) Using the WWW to access the BIOSCI/bionet newsgroups.
--------------------------------------------------------
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-------------------------------------------------------
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From owner-molec-model@net.bio.net Sat Nov 28 22:00:00 1998
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From: tfwwco@YAHOO.COM
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From owner-molec-model@net.bio.net Sun Nov 29 22:00:00 1998
Path: biosci!SYR.EDU!desingh
From: desingh@SYR.EDU (Deepak Singh)
Newsgroups: bionet.molec-model
Subject: Subscription
Date: 30 Nov 1998 07:43:28 -0800
Organization: Dept. of Chemistry, Syracuse Univ.
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I just sent a similar message to the computational biology newsgroup.
Ho wdo I subscribe?

Deepak.


--
**********************************************************************
Deepak Singh    Email: desingh@syr.edu
Graduate Fellow    URL: http://web.syr.edu/~desingh
Department of Chemistry and Biochemistry, Tel: (315) 443 1739 -- work
Syracuse University          (315) 472 9659 -- home
1-014 Scitech Syracuse NY 13244  Fax: (315) 443 4070

"Violence is the last resort of the incompetent". -- Salvor Hardin
**********************************************************************



From owner-molec-model@net.bio.net Mon Nov 30 22:00:00 1998
From: "clive delmonte" <clived@ndirect.co.uk>
Newsgroups: bionet.biophysics,bionet.molec-model,bionet.xtallography
Subject: DNA Structure: Puzzle Number 2
Date: Tue, 1 Dec 1998 10:19:15 -0000
Lines: 32
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Path: biosci!agate!newsfeed.berkeley.edu!btnet-peer!btnet!news-lond.gip.net!news.gsl.net!gip.net!demeter.clara.net!news.clara.net!peer.news.nildram.co.uk!news-peer.netdirect.net.uk!news.netdirect.net.uk!195.7.227.184
Xref: biosci bionet.biophysics:4608 bionet.molec-model:2334 bionet.xtallography:4500

It was Franklin's famous diffraction photograph of B-DNA (2), shown to him
by Wilkins, that Watson sketched on the train back to Cambridge to rejoin
Crick.

One of Wilkins' collaborators, A R Stokes (3), working on the Fourier
transform for a helix, showed that, defining as "delta" the angle between an
arm of the "helical cross" and the Y-axis (meridian),

        tan delta = helical pitch / helical circumference

Applying this result to Franklin's photograph of B-DNA, delta is measured as
40 degrees, and, with a pitch of 3.34 nm, the helical diameter is found to
be some 1.3 nm.

For a supposed double helical diameter of 2 to 2.2 nm, delta should be 28 -
26 degrees respectively, far removed from the actual value of 40.

Interestingly, the helical diameter of 1.3 nm, found from Stokes equation
applied to Franklin's photograph, coincides with the STM value of 1.3 nm
measured by Lee et al. (Puzzle 1, ref. 1) and recorded in their Figure 3(D).


2        Molecular Configuration in Sodium Thymonucleate; R.E. Franklin &
R.G. Gosling; Nature Vol 171 (1953) 740 - 741

3        The Theory of X-ray Fibre Diagrams; A.R. Stokes; Prog. Biophys. &
Biophys. Chem. Vol 5 (1955) 140 - 167
--------------------------------------------------------------
Clive Delmonte




From owner-molec-model@net.bio.net Mon Nov 30 22:00:00 1998
From: "clive delmonte" <clived@ndirect.co.uk>
Newsgroups: bionet.biophysics,bionet.molec-model,bionet.xtallography
Subject: DNA Structure: Puzzle Number 3
Date: Tue, 1 Dec 1998 10:33:37 -0000
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Xref: biosci bionet.biophysics:4609 bionet.molec-model:2335 bionet.xtallography:4501

In 1953, James & Mazia (4) reported that 1 mg of dry calf thymus DNA could
be spread in a monolayer to cover 0.28 sq. m. From this measurement, it is
possible to calculate the diameter of the DNA as it lies across the film
surface.

Calf thymus DNA, with 40% C+G base pairs, has an average mass of 330 daltons
per base unit, and a base repeat distance of 0.334 nm, giving a helical
diameter. measured across the surface film, of 1.2 nm.

James & Mazia measured the film height as 2.16 nm using an ellipsometer.  So
there are two independent determinations of the height and width of the
duplex DNA as 1.2 nm x 2.1 nm, that is, DNA would have an elliptical cross
section.

The DNA molecular width in the film of 1.2 nm is close to that of 1.3 nm
found by Lee et al. (Puzzle 1, ref 1) using STM on duplexes not under
lateral compression, and to the value found by applying Stokes' equation
(Puzzle 2, ref. 3) to Franklin's B-DNA photograph.

4        Surface Films of Desoxyribonucleic Acid; T.W. James & D. Mazia;
Biochim. Biophys. Acta Vol 10 (1953) 367 - 370
------------------------------------------------------------------
Clive Delmonte






From owner-molec-model@net.bio.net Mon Nov 30 22:00:00 1998
From: "clive delmonte" <clived@ndirect.co.uk>
Newsgroups: bionet.biophysics,bionet.molec-model,bionet.xtallography
Subject: DNA Structure: Puzzle Number 1
Date: Tue, 1 Dec 1998 10:01:47 -0000
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Xref: biosci bionet.biophysics:4606 bionet.molec-model:2333 bionet.xtallography:4499

In their STM study of nucleic acids (1), Lee et al. recorded in Figure 3(b)
lengthy stretches of at least four well-resolved linear DNA duplexes.


The vital feature of this image of DNA molecules is that no plectonaemic
winding can be discerned.  That is, they show no sign of being
double-helical.  The duplexes consist of long, paired, helices with a
consistent, uninterrupted parallel (or antiparallel) contour running between
the two strands of each of the four duplexes, whose highlighted features
remain exactly in phase with each other over their whole lengths, extending
to some 17 - 20 full helical turns.




1        Scanning Tunnelling Microscopy of Nucleic Acids; G. Lee, P.G.
Arscott, V.A. Bloomfield & D. Fennell Evans; SCIENCE Vol 244 (1989) 475 -
477

----------------------------------------------------------------------------
Clive Delmonte




