New GFP request

Jamie White jwhite at embl-heidelberg.de
Wed May 8 03:47:45 EST 1996

In article <mab-0605962321320001 at f180-086.net.wisc.edu>,
mab at plantpath.wisc.edu wrote:

> ...I am looking for the
> new version of GFP that is much brighter than the original.  

There are a couple of GFP variants that you might be interested in.  The
most obvious is the S65T mutant described by Heim et.al. (1995) Nature
373:663-4.  I am using this construct and it makes E.coli quite green when
driven by a T7 promotor.

Recently Crameri et.al. (1996) Nature Biotechnology 14:315-318 described a
GFP variant which they report is 45x brighter as the wt GFP, or 6-8x
brighter than S65T.  I wrote to request this mutant; I include the
response I got from Pim Stemmer at the end of this post. 

Both of these GFP variants have the advantage that their excitiation peak
is around the 488nm emmission line of an Argon-Ion laser.  Their emmission
is reported to be around 510nm.  These spectral characteristics match
common filter sets used for FITC fairly well.

There is also a brighter blue GFP variant, Y66H/Y145F, described by Heim &
Tsien (1996) Curr Biol 6:178-182.  Its absorbance peak is ~380nm, and it
emits around  445nm.  You might want to consider this if you're trying

Check out Gibco-BRL and Clontech catalogs.  I know that these 2 companies
sell GFP related products, but I have no idea what their current offerings
are.  Otherwise I'd contact the authors of the papers describing the
mutants you are interested in.

Jamie White
Light Microscopy Group
Cell Biophysics Programme
European Molecular Biology Laboratory
Meyerhofstrasse 1, Postfach 10.2209
D-69117 Heidelberg Germany
+49 6221 / 387 367 voice
+49 6221 / 387 242 fax 
finger jwhite at phenix.embl-heidelberg.de

Here's the response I got regarding the c3 variant of Crameri et. al.:

X-Sender: jwhite at popserver.embl-heidelberg.de
Mime-Version: 1.0
Date: Wed, 08 May 1996 10:13:14 +0200
To: jwhite
From: Pim Stemmer <Pim_Stemmer at qmgate.affymax.com> 
Subject: RE>request for c3 GFP mutant

Dear colleague,

Thank you for your interest in our GFP mutant constructs that were developed 
by gene shuffling technology. 
Affymax Research Institute has formed an independent unit, called Maxygene, to 
focus on commercial application of gene shuffling technology, including 
research reagents such as GFP derivatives. 
We are distributing the prokaryotic and the eukarytic GFP constructs for US$
200 each. They are supplied as freeze dried plasmids (5 ug each; pBAD-GFP 
cycle 3 and Alpha+GFP cycle 3). Both are supplied with diskettes containing 
the full sequence of both plasmids and GFP as textfiles. No special expression 
host is required. Our results were published and the vectors described by 
Crameri et al., Nature Biotechnology 14:315-319 (1996). The bacterial vector 
we used was described by Guzman et al., J. Bacteriol. 177:4121-4130 (1995), 
and the eukaryotic vector by Whitehorn et al., Bio/Technology 13:1215-1219 (
1995). Useful restriction sites are listed below.

Please let me know if you are interested in obtaining one or both vectors.
We will need the shipping and billing address, as well as a purchase order 
Upon receipt of your order we will send you the materials by overnight mail, 
and mail the invoice separately to your institutionUs billing address. 

Sincerely - 

Willem P.C. Stemmer, Ph.D.
Andreas Crameri,
Maxygen / Affymax Research Institute
4001 Miranda Avenue
Palo Alto, CA 94304.

Ordering and technical information:
phone: 415-812-8818
fax: 415-424-0832
e-mail: pim_stemmer at qmgates.affymax.com

Restriction sites flanking GFP:
Alpha+GFP cycle3: 
Xho2-XhoI-XbaI-NheI(--GFP gene--) EcoRI-EcoRV-HinDIII-ClaI-BamHI
pBAD-GFP cycle 3:
BamHI-NdeI-NheI(--GFP gene--)EcoRI-KpnI-XmaI-SmaI-BamHI-XbaI-SalI-PstI-SphI-
A full sequence restriction map is provided with each plasmid.
Limited Product Warranty
Any product that does not meet quality criteria will be replaced promptly, 
free of charge. This warranty limits our liability to the replacement of the 
product. No other warranties of any kind, express or implied, including 
without limitation, implied warranties of merchantability or fitness for a 
particular purpose, are provided by Maxygen or by Affymax. Maxygen or Affymax 
shall have no liability for any direct, indirect, consequential or incidental 
damages arising out of the use, the results of use or the inability to use any 
Please do not return material.  Call Technical Support (415) 812-8818 for 
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All Maxygen products are sold for research and/or in vitro use only.

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