Structural highlights
1odn is a 1 chain structure with sequence from A. nidulans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
|
| Ligands: | , , |
| Related: | 1bk0, 1blz, 1hb1, 1hb2, 1hb3, 1hb4, 1ips, 1obn, 1odm, 1oc1, 1qiq, 1qje, 1qjf |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum |
Function
[IPNS_EMENI] Removes, in the presence of oxygen, 4 hydrogen atoms from delta-L-(alpha-aminoadipyl)-L-cysteinyl-D-valine (ACV) to form the azetidinone and thiazolidine rings of isopenicillin.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Isopenicillin N synthase (IPNS) catalyses conversion of the linear tripeptide delta-(L-alpha-aminoadipoyl)-L-cysteinyl-D-valine (ACV) to isopenicillin N (IPN), the central step in biosynthesis of the beta-lactam antibiotics. The unsaturated substrate analogue delta-(L-alpha-aminoadipoyl)-L-cysteinyl-D-vinylglycine (ACvG) has previously been incubated with IPNS and single product was isolated, a 2-alpha-hydroxymethyl isopenicillin N (HMPen), formed via a monooxygenase mode of reactivity. ACvG has now been crystallised with IPNS and the structure of the anaerobic IPNS:Fe(II):ACvG complex determined to 1.15 A resolution. Furthermore, by exposing the anaerobically grown crystals to high-pressure oxygen gas, a structure corresponding to the bicyclic product HMPen has been obtained at 1.60 A resolution. In light of these and other IPNS structures, and recent developments with related dioxygenases, the [2 + 2] cycloaddition mechanism for HMPen formation from ACvG has been revised, and a stepwise radical mechanism is proposed. This revised mechanism remains consistent with the observed stereospecificity of the transformation, but fits better with apparent constraints on the coordination geometry around the active site iron atom.
Crystallographic studies on the reaction of isopenicillin N synthase with an unsaturated substrate analogue.,Elkins JM, Rutledge PJ, Burzlaff NI, Clifton IJ, Adlington RM, Roach PL, Baldwin JE Org Biomol Chem. 2003 May 7;1(9):1455-60. PMID:12926272[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Elkins JM, Rutledge PJ, Burzlaff NI, Clifton IJ, Adlington RM, Roach PL, Baldwin JE. Crystallographic studies on the reaction of isopenicillin N synthase with an unsaturated substrate analogue. Org Biomol Chem. 2003 May 7;1(9):1455-60. PMID:12926272
