Download MendeleyThe structure of VibH represents nonribosomal peptide synthetase condensation, cyclization and epimerization domains.
Keating, T.A., Marshall, C.G., Walsh, C.T., Keating, A.E.(2002) Nat Struct Biol 9: 522-526
- PubMed: 12055621
- DOI: https://doi.org/10.1038/nsb810
- Primary Citation of Related Structures:
1L5A - PubMed Abstract:
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.
Organizational Affiliation:
Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.
