2VBD image
Deposition Date 2007-09-10
Release Date 2008-09-23
Last Version Date 2024-05-08
Entry Detail
PDB ID:
2VBD
Keywords:
Title:
Isopenicillin N synthase with substrate analogue L,L,L-ACOMP (unexposed)
Biological Source:
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:ISOPENICILLIN N SYNTHETASE
Gene (Uniprot):ipnA
Chain IDs:A
Chain Length:331
Number of Molecules:1
Biological Source:Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139)
Primary Citation
The Crystal Structure of an Lll-Configured Depsipeptide Substrate Analogue Bound to Isopenicillin N Synthase.
Org.Biomol.Chem. 8 122 ? (2010)
PMID: 20024142 DOI: 10.1039/B910170E

Abstact

Isopenicillin N synthase (IPNS) is a non-heme iron(ii) oxidase, which catalyses the biosynthesis of isopenicillin N (IPN) from the tripeptide delta-l-alpha-aminoadipoyl-l-cysteinyl-d-valine (lld-ACV) in a remarkable oxidative bicyclisation reaction. The natural substrate for IPNS is the lld-configured tripeptide. lll-ACV is not turned over by the enzyme, but inhibits turnover of the lld-tripeptide. The mechanism by which this inhibition takes place is not fully understood. Recent studies have employed a range of lld-configured depsipeptide substrate analogues in crystallographic studies to probe events preceding beta-lactam closure in the IPNS reaction cycle. Herein, we report the first crystal structure of IPNS in complex with an lll-configured depsipeptide analogue, delta-l-alpha-aminoadipoyl-l-cysteine (1-(R)-carboxy-2-thiomethyl)ethyl ester (lll-ACOmC). This report describes the crystal structure of the IPNS:Fe(ii):lll-ACOmC complex to 2.0 A resolution, and discusses attempts to oxygenate this complex at high pressure in order to probe the mechanism by which lll-configured substrates inhibit IPNS catalysis.

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