2q6i: Difference between revisions

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[[Image:2q6i.jpg|left|200px]]
{{Seed}}
[[Image:2q6i.png|left|200px]]


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{{STRUCTURE_2q6i|  PDB=2q6i  |  SCENE=  }}  
{{STRUCTURE_2q6i|  PDB=2q6i  |  SCENE=  }}  


'''salL with ClDA and LMet'''
===salL with ClDA and LMet===




==Overview==
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Halogen atom incorporation into a scaffold of bioactive compounds often amplifies biological activity, as is the case for the anticancer agent salinosporamide A (1), a chlorinated natural product from the marine bacterium Salinispora tropica. Significant effort in understanding enzymatic chlorination shows that oxidative routes predominate to form reactive electrophilic or radical chlorine species. Here we report the genetic, biochemical and structural characterization of the chlorinase SalL, which halogenates S-adenosyl-L-methionine (2) with chloride to generate 5'-chloro-5'-deoxyadenosine (3) and L-methionine (4) in a rarely observed nucleophilic substitution strategy analogous to that of Streptomyces cattleya fluorinase. Further metabolic tailoring produces a halogenated polyketide synthase substrate specific for salinosporamide A biosynthesis. SalL also accepts bromide and iodide as substrates, but not fluoride. High-resolution crystal structures of SalL and active site mutants complexed with substrates and products support the S(N)2 nucleophilic substitution mechanism and further illuminate halide specificity in this newly discovered halogenase family.
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{{ABSTRACT_PUBMED_18059261}}


==About this Structure==
==About this Structure==
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[[Category: Chlorinase]]
[[Category: Chlorinase]]
[[Category: Clda and l-met complex]]
[[Category: Clda and l-met complex]]
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Revision as of 23:35, 27 July 2008

File:2q6i.png

Template:STRUCTURE 2q6i

salL with ClDA and LMet

Template:ABSTRACT PUBMED 18059261

About this Structure

2Q6I is a Single protein structure of sequence from Bacteria. Full crystallographic information is available from OCA.

Reference

Discovery and characterization of a marine bacterial SAM-dependent chlorinase., Eustaquio AS, Pojer F, Noel JP, Moore BS, Nat Chem Biol. 2008 Jan;4(1):69-74. Epub 2007 Dec 2. PMID:18059261

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