1mdf

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{{STRUCTURE_1mdf| PDB=1mdf | SCENE= }}
{{STRUCTURE_1mdf| PDB=1mdf | SCENE= }}
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'''CRYSTAL STRUCTURE OF DhbE IN ABSENCE OF SUBSTRATE'''
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===CRYSTAL STRUCTURE OF DhbE IN ABSENCE OF SUBSTRATE===
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==Overview==
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The synthesis of the catecholic siderophore bacillibactin is accomplished by the nonribosomal peptide synthetase (NRPS) encoded by the dhb operon. DhbE is responsible for the initial step in bacillibactin synthesis, the activation of the aryl acid 2,3-dihydroxybenzoate (DHB). The stand-alone adenylation (A) domain DhbE, the structure of which is presented here, exhibits greatest homology to other NRPS A-domains, acyl-CoA ligases and luciferases. It's structure is solved in three different states, without the ligands ATP and DHB (native state), with the product DHB-AMP (adenylate state) and with the hydrolyzed product AMP and DHB (hydrolyzed state). The 59.9-kDa protein folds into two domains, with the active site at the interface between them. In contrast to previous proposals of a major reorientation of the large and small domains on substrate binding, we observe only local structural rearrangements. The structure of the phosphate binding loop could be determined, a motif common to many adenylate-forming enzymes, as well as with bound DHB-adenylate and the hydrolyzed product DHB*AMP. Based on the structure and amino acid sequence alignments, an adapted specificity conferring code for aryl acid activating domains is proposed, allowing assignment of substrate specificity to gene products of previously unknown function.
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(as it appears on PubMed at http://www.pubmed.gov), where 12221282 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12221282}}
==About this Structure==
==About this Structure==
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[[Category: Peptide synthetase]]
[[Category: Peptide synthetase]]
[[Category: Siderophore formation]]
[[Category: Siderophore formation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:54:39 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 23:43:51 2008''

Revision as of 20:43, 2 July 2008

Image:1mdf.png

Template:STRUCTURE 1mdf

CRYSTAL STRUCTURE OF DhbE IN ABSENCE OF SUBSTRATE

Template:ABSTRACT PUBMED 12221282

About this Structure

1MDF is a Single protein structure of sequence from Bacillus subtilis. Full crystallographic information is available from OCA.

Reference

Crystal structure of DhbE, an archetype for aryl acid activating domains of modular nonribosomal peptide synthetases., May JJ, Kessler N, Marahiel MA, Stubbs MT, Proc Natl Acad Sci U S A. 2002 Sep 17;99(19):12120-5. Epub 2002 Sep 9. PMID:12221282

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