1l5a
From Proteopedia
(New page: 200px<br /><applet load="1l5a" size="450" color="white" frame="true" align="right" spinBox="true" caption="1l5a, resolution 2.55Å" /> '''Crystal Structure of...) |
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| - | [[Image:1l5a.gif|left|200px]]<br /><applet load="1l5a" size=" | + | [[Image:1l5a.gif|left|200px]]<br /><applet load="1l5a" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1l5a, resolution 2.55Å" /> | caption="1l5a, resolution 2.55Å" /> | ||
'''Crystal Structure of VibH, an NRPS Condensation Enzyme'''<br /> | '''Crystal Structure of VibH, an NRPS Condensation Enzyme'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Nonribosomal peptide synthetases (NRPSs) are large, multidomain enzymes | + | Nonribosomal peptide synthetases (NRPSs) are large, multidomain enzymes that biosynthesize medically important natural products. We report the crystal structure of the free-standing NRPS condensation (C) domain VibH, which catalyzes amide bond formation in the synthesis of vibriobactin, a Vibrio cholerae siderophore. Despite low sequence identity, NRPS condensation enzymes are structurally related to chloramphenicol acetyltransferase (CAT) and dihydrolipoamide acyltransferases. However, although the latter enzymes are homotrimers, VibH is a monomeric pseudodimer. The VibH structure is representative of both NRPS condensation and epimerization domains, as well as the condensation-variant cyclization domains, which are all expected to be monomers. Surprisingly, despite favorable positioning in the active site, a universally conserved histidine important in CAT and in other C domains is not critical for general base catalysis in VibH. |
==About this Structure== | ==About this Structure== | ||
| - | 1L5A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae]. Full crystallographic information is available from [http:// | + | 1L5A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L5A OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Vibrio cholerae]] | [[Category: Vibrio cholerae]] | ||
| - | [[Category: Keating, A | + | [[Category: Keating, A E.]] |
| - | [[Category: Keating, T | + | [[Category: Keating, T A.]] |
| - | [[Category: Marshall, C | + | [[Category: Marshall, C G.]] |
| - | [[Category: Walsh, C | + | [[Category: Walsh, C T.]] |
[[Category: amide synthase]] | [[Category: amide synthase]] | ||
[[Category: nonribosomal peptide synthetase]] | [[Category: nonribosomal peptide synthetase]] | ||
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[[Category: vibriobactin]] | [[Category: vibriobactin]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:41:28 2008'' |
Revision as of 11:41, 21 February 2008
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Crystal Structure of VibH, an NRPS Condensation Enzyme
Overview
Nonribosomal peptide synthetases (NRPSs) are large, multidomain enzymes that biosynthesize medically important natural products. We report the crystal structure of the free-standing NRPS condensation (C) domain VibH, which catalyzes amide bond formation in the synthesis of vibriobactin, a Vibrio cholerae siderophore. Despite low sequence identity, NRPS condensation enzymes are structurally related to chloramphenicol acetyltransferase (CAT) and dihydrolipoamide acyltransferases. However, although the latter enzymes are homotrimers, VibH is a monomeric pseudodimer. The VibH structure is representative of both NRPS condensation and epimerization domains, as well as the condensation-variant cyclization domains, which are all expected to be monomers. Surprisingly, despite favorable positioning in the active site, a universally conserved histidine important in CAT and in other C domains is not critical for general base catalysis in VibH.
About this Structure
1L5A is a Single protein structure of sequence from Vibrio cholerae. Full crystallographic information is available from OCA.
Reference
The structure of VibH represents nonribosomal peptide synthetase condensation, cyclization and epimerization domains., Keating TA, Marshall CG, Walsh CT, Keating AE, Nat Struct Biol. 2002 Jul;9(7):522-6. PMID:12055621
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