It looks like the density suggests an S-S bond.  Perhaps try CME?

https://www.rcsb.org/ligand/CME


John J. Tanner
Professor of Biochemistry and Chemistry
Associate Chair of Biochemistry
University of Missouri
117 Schweitzer Hall
503 S. College Ave.
Columbia, MO 65211
Phone: 573-884-1280
Fax: 573-882-5635
Email: tanne...@missouri.edu<mailto:tanne...@missouri.edu>
http://faculty.missouri.edu/~tannerjj/tannergroup/tanner.html
Lab: Schlundt Annex rooms 3,6,9, 203B, 203C
Office: Schlundt Annex 203A






On Mar 27, 2020, at 3:32 PM, Cowan, Richard H. (Dr.) 
<rc...@leicester.ac.uk<mailto:rc...@leicester.ac.uk>> wrote:

Hi All,

During the current enforced shutdown, I've been going back over some older data 
and spotted this in one of my structures:

<Outlook-qps5xcao.png>


It's what appears to be a covalent aduct onto a cysteine on the surface 
(originally modeled as 2 waters!). The condition was optimized from the 
Morpheus Screen condition D1, so MES/Imidazole pH 6.5, PEG 500MME, PEG20k and a 
mix of 1,6-Hexanediol, 1-Butanol, 1,2-Propanediol, 2-Propanol, 1,4-Butanediol 
and 1,3-Propanediol. The data has been cut at 1.7A, with good stats.

Has anyone seen anything like this before? what do you think my best bet for 
modeling this is? and aduct of 1,3-propanediol? It looks too short for 
1-butanol or 1,4-butandiol, and it's linear so 2-propanol and 1,2-propanediol 
seem unlikely.

Thanks,

Dr Richard Cowan
Research Associate

HWLSB 1/05
Department of Biochemistry
University of Leicester
Lancaster Road
Leicester, LE1 9HN, U.K.

Phone +44 (0) 116 229 7077


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