From owner-biophysics@net.bio.net Thu Apr 01 23:00:00 1999
From: "Clive Delmonte" <clived@ndirect.co.uk>
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Subject: DNA Structure: Puzzle #8 (Version 2)
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The Crystallographers' Paradox

Several teams of nucleic acid crystallographers have reported on the
interconversion of the B to the Z form under very mild conditions inside
fibres of drawn DNA (22,23), as well as the B to form D conversion under
similar, very mild conditions (24).

The very mild conditions are interpreted by some (23,24) to mean that the B
and Z forms, and the B and D forms, respectively, must have the same helical
handedness.  (Another team (22) seems to offer no interpretation of its
observation of the B to Z transition inside a fibre.) The reversible
conversion inside fibres of the A to, and from, the B form has been known
for many years, and therefore the A, B, D and Z forms would all seem to have
the same helical handedness.

However, there are many studies of diffraction from true oligonucleotide
crystals which purport to show that the A and B forms are right-handed, for
example (25,26), and purport to show that the Z form is left-handed, for
example (27).

How can all the crystallographers be right ?
------------------------------------------------------------
22        Polymorphism of DNA Double Helices; A.G.W. Leslie, S. Arnott, R.
Chandrasekaran & R.L. Ratliff; J Mol Biol Vol 143 (1980) 49 - 72

23       B to Z Transition in a DNA Fibre: The Question of Handedness of
the Duplex; V. Sasisekharan & S.K. Brahmachari; Current Science Vol 50
(1981) 10 - 13

24       Time-resolved X-ray Diffraction Studies of the B to D Structural
Transition in the DNA Double Helix; A. Mahendrasingham, V.T. Forsyth, R.
Hussain, R.J. Greenall, W.J. Pigram & W. Fuller; SCIENCE Vol 233 (1986)
195 - 197

25       Conformation of d(GGGATCCC) x 2 in crystals and in solution
studied by X-ray diffraction, Raman spectroscopy and molecular modelling; H.
Fabian, W. Holzer, U. Heinemann, H. Sklenar & H. Welfle; Nucleic Acids
Research Vol 21 (1993) 569 - 576

26       Crystal Structure Analysis of a Complete Turn of B-DNA; R. Wing,
H. Drew, T. Takano, C. Broka, S. Tanaka, K. Itakura & R.E. Dickerson; Nature
Vol 287 (1980) 755 - 758

27       Molecular Structure of a Left-handed Double Helical DNA Fragment
at Atomic Resolution; A.H.-J. Wang, G.J. Quigley, F.J. Kolpak, J.L.
Crawford, J.H. van Boom, G. van der Marel & A. Rich; Nature Vol 282 (1979)
680 - 686
--------------------------------------------------------------------------
Clive Delmonte




From owner-biophysics@net.bio.net Fri Apr 02 23:00:00 1999
From: "Clive Delmonte" <clived@ndirect.co.uk>
Newsgroups: bionet.biophysics
Subject: DNA Structure: Puzzle # 9 (Version 2)
Date: Fri, 2 Apr 1999 19:28:54 +0100
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 Z-DNA

Miller et al. (28) reported that, using duplex poly deoxy (Guanosine -
5-methyl-Cytosine), the B to Z transition took place an order of magnitude
faster when the polymer in the B form was fully wound round nucleosome cores
than when the B-DNA was free in solution.

If Z-DNA really were left-handed, how would a right to left helical
transition in duplex DNA take place an order of magnitude faster when wound
around nucleosomal histones than when free in solution?

There is a clue to a possible answer in the work of Sasisekharan &
Brahmachari(Puzzle #8, ref. 23) who suggest that B- and Z-DNA have the same
helical handedness since the B to Z transition is seen by several groups to
occur under very mild conditions inside a solid fibre.  (Such reasoning
had been advanced many years earlier as support for the proposition that the
A & B forms had the same handedness because of the same observation.)

Then the B to Z transition could be faster on nucleosomes because of the
highly ordered structure, and slower in solution because of the high degree
of folding and twisting of the duplex in solution.

We recall that there is actually no direct experimental evidence that Z-DNA
is left-handed.  Topological experiments predicated on its left-handedness
have failed (e.g., 29), and none known to me have succeeded.  The X-ray
diffraction reports on Z-DNA structure were based on fitting the data to a
model chosen by the workers themselves (e.g., Ref. 30 (Note 19) and Ref. 31
(page 4017, "... we should again attempt the method...using a trial model of
left-handed Z-DNA.))

On this basis, the fast B to Z transition observed by Miller et al. might
merely consist of Watson-Crick base pairs becoming Hoogsteen pairs, by a
fast purine flip, leading to CD inversion at certain frequencies, with both
B & Z forms being right-handed.   With a Hoogsteen base pair width of
0.88nm, a true side-by-side duplex (see attachment) has a major elliptical
axis of some 1.76 nm and will just fit into certain reported, small unit
cells such as that of Arnott & Selsing (Puzzle #7, Ref. 20 (1.78nm)), for
example, which is too small to accommodate a Watson-Crick double helix.
This proposal was first published in 1991 (Puzzle #1, Ref. 2).
--------------------------------------------
28    Nucleosome-core Assembly on B & Z Forms of Duplex
Poly(d(G-5-methyl-C)); F.D. Miller, J.B. Rattner & J.H. van der Sande: Cold
Spring Harbor Symposia on Quantitative Biology Vol 47 (1983) 571-575

29 DNA conformation & chromatin organisation of a d(CA/GT) x 30 sequence
cloned in SV40 minichromosomes; A. Rodriguez-Campos et al.; The EMBO J Vol 5
(1986) 1727 - 1734

30 Left-handed Double Helical DNA: Variations in the Backbone Conformation;
A.H.-J. Wang et al.; SCIENCE Vol 211 (1981) 171 - 176

31    The tetramer d(CGCG) crystallises as a left-handed double helix;
J.L.Crawford et al.; Proc Nat Acad Sci (USA); Vol 77 (1980) 4016 - 4020
---------------------------------------------------------
Clive Delmonte




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`
end


From owner-biophysics@net.bio.net Sun Apr 04 23:00:00 1999
Path: biosci!fcrdcnews.NCIFCRF.GOV!washdc3-snf1!cpk-news-hub1.bbnplanet.com!news.gtei.net!newsfeed.cwix.com!130.185.14.36!torn!news1.bellglobal.com!news21.bellglobal.com.POSTED!not-for-mail
From: spice-girls@tmp.net
Newsgroups: bionet.biophysics
Subject: SPICE GIRLS * Scary * Baby * Posh * Sporty * Ginger * 11350
Message-ID: <05049915.3028@tmp.net>
Organization: Spice Girls Naked !!!
Distribution: World
Reply-To: spice-girls@topfreesex.com
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Date: Mon, 05 Apr 1999 19:31:51 GMT
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Free Spice Girls Pics at

http://Www.TopFreeSex.ComY4rkWzjZr+ffP8g4JbB`HO"gcXxr@f7A:NTm9;L\S-Hh1RH6m#$z*i]iDZYu"'rC]Q5os>nv5Gk)lT*PN%_#dk?l&t

From owner-biophysics@net.bio.net Sun Apr 04 23:00:00 1999
Path: biosci!agate!newsfeed.berkeley.edu!cyclone.bc.net!unixg.ubc.ca!not-for-mail
From: "J. Christian Hesketh" <chesketh@interchange.ubc.ca>
Newsgroups: bionet.biophysics
Subject: Need help with Junction Potentials
Date: Mon, 05 Apr 1999 16:04:30 -0700
Organization: University of British Columbia
Lines: 14
Message-ID: <3709417D.C21BF28B@interchange.ubc.ca>
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Hello,

I am calculating junction potentials for internal and external solutions
containing high cesium and high NMDG+ respectively.  My question is:
what is the ionic mobility of NMDG??  I cannot find this value anywhere
(checked CRC/Hille/Merck) and I was wondering if someone could tell me
this value??  I would like it relative to the mobility of K+ (value of
1.0), however any format would be helpful.

Thanks in advance,

J. Christian Hesketh - University of British Columbia
http://members.xoom.com/IonChannel/


From owner-biophysics@net.bio.net Tue Apr 06 23:00:00 1999
Path: biosci!news.stanford.edu!newsfeed.stanford.edu!logbridge.uoregon.edu!europa.clark.net!209.44.33.119!hub1.ispnews.com!news14.ispnews.com.POSTED!not-for-mail
Message-ID: <370AD038.28398815@wireco.net>
From: Mike Houchins <MikeH@wireco.net>
X-Mailer: Mozilla 4.5 [en] (Win95; U)
X-Accept-Language: en
MIME-Version: 1.0
Newsgroups: bionet.biophysics
Subject: Bacteriorhodopsin...
Content-Type: text/plain; charset=us-ascii
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Lines: 9
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X-Trace: news14.ispnews.com 923455676 206.107.119.109 (Tue, 06 Apr 1999 23:27:56 EDT)
NNTP-Posting-Date: Tue, 06 Apr 1999 23:27:56 EDT
Date: Tue, 06 Apr 1999 23:25:44 -0400

Does anyone know of a commercial source for bacteriorhodopsin or for
Halobacterium salinarium (one of the bacteria that contain the
protein).  I can grow my own but it sure would save time if I could buy
the stuff ready to go.

Post to group or E-mail MikeH@wireco.net

Thanks in advance for any info.


From owner-biophysics@net.bio.net Tue Apr 06 23:00:00 1999
From: "Clive Delmonte" <clived@ndirect.co.uk>
Newsgroups: bionet.biophysics
Subject: DNA Structure: Puzzle #10 (Version 2)
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More Fun with Z-DNA

Chen (32) reported that methylated poly(dC.dG) x 2  existed in the Z form
at both low and high salt concentrations, and that both of these forms were
interconvertible into a B form at intermediate salt concentrations.

A rather similar sequence of interconversions, of Z to A and then on to a
further Z form was reported by Wu & Behe (33) as they raised the salt
concentration monotonically from low to high values in their study.

Are we to consider that all of these interconvertible transitions were of
left going to right and then back to left-handed forms as the salt
concentration was raised ?

In Puzzle #8, The Crystallographers' Paradox, we saw how the proposition
that Z, A and B forms had the same helical handedness allowed an explanation
of the results of fibre transitions of B to Z, and also those of Miller et
al. (Puzzle #9) for the much
accelerated B to Z transition with DNA when around nucleosomal cores.

For refs. 32 and 33 we can consider as a working hypothesis that there are
several right-handed "Z" forms (both based on Hoogsteen pairing), rather as
there are several right-handed forms (A & B) based on Watson-Crick pairing,
and it is one of these several Z forms which lie on each side of the B and A
forms reported
respectively in refs. 32 and 33.
-------------------------------------------------------------
32        Conformational Lability of Poly(dG.5 methyl dC); Fu-Ming Chen;
Nucl Acids Res Vol 14 (1986) 5081 - 5097

33        Salt-induced Z-A-Z transition sequence in the mixed ribo-deoxyribo
copolymer poly (rG-dC); H.-Y. Wu & M.J. Behe; Proc Nat Acad Sci (USA) Vol 81
(1984) 7284 - 7287
--------------------------------------------------------------
Clive Delmonte




From owner-biophysics@net.bio.net Wed Apr 07 23:00:00 1999
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From: Datan GmbH <dataplore@datan.de>
Newsgroups: bionet.biophysics
Subject: Time series analysis software
Date: Thu, 08 Apr 1999 12:47:27 +0200
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If you are looking for scientific time series and data analysis software
providing e.g.

- analysis of biophysical or biomedical signals (ECG, EEG, blood
pressure etc.)
- detection and investigation of rhythms and synchronisation
- correlation and coupling analysis
- statistical tests and modeling
- linear and nonlinear dynamics
- numerous types of spectra and time-frequency spectra
- hundreds of standard features for signal handling and processing
- a convenient graphical user interface
- an easy-to-learn macro language for implementing user-defined
algorithms

you might be interested in the new release of Dataplore 2.0.

Further information and downloads under

        http://datan.de/dataplore

Best regards,

Dr. Ralf Vandenhouten
Datan Software & Analysis

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From owner-biophysics@net.bio.net Wed Apr 07 23:00:00 1999
From: "Clive Delmonte" <clived@ndirect.co.uk>
Newsgroups: bionet.biophysics
Subject: DNA Structure: Puzzle #11 (Version 1)
Date: Thu, 8 Apr 1999 15:46:27 +0100
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The Unwinding Problem of Duplex DNA in Solutions


Alexander & Stacey (34) have reported that duplex DNA will denature and
separate into individual strands at room temperature in dilute aqueous
solutions of urea (less than 0.003%).  Aqueous urea is known to break the
hydrogen bonds in base pairs.

Another team reported that the relative molecular mass of duplex RNA could
be halved solely by diluting a concentrated aqueous solution with water
alone at room temperature.

Heat would not seem to have provided the energy for the denaturation of
these complexes and there seems to be minimal entanglement of the strands.

The difficulty of unwinding a double helix was foreseen some 45 years ago
when Max Delbruck, 1969 Nobel Prizewinner for Molecular Biology, wrote to
his student, Jim Watson in 1953:

"These (the two DNA strands) would have to be untwiddled to separate the
threads...In any event, one must postulate that the DNA opens up in some
manner, both for replication and for doing its business otherwise.  In the
structure you describe (the double helix) this opening up is opposed by both
the two hydrogen bonds per nucleotide, and by the interlocking of the
helices, and it becomes a very important consideration to find a way out of
this dilemma, or to think of a modification of the structure that does not
involve interlocking."

Delbruck's prescience stands out across the years.

A true side-by-side model, sketched in the attachment, and independently
reported by Lee et al. (SCIENCE 244 (1989) 475 - 477 (Figures 3b and 3d))
allows the strands to drift apart, driven by phosphate ion repulsions and
Brownian motion, after the hydrogen bonding of the base pairs has been
disrupted.
------------------------------------------------------------
34        Recent Work On Nucleic Acids; Contribution by P. Alexander & K.A.
Stacey; Nature Vol 178 (1956) 1320 - 1321
------------------------------------------------------------
Clive Delmonte



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