Structural and functional divergence of insect CYP6B proteins: From specialist to generalist cytochrome P450.

ABSTRACT: How polyphagous herbivores cope with the diversity and unpredictability of plant defenses remains largely unknown at both the genetic and molecular levels. To examine whether generalist counterdefense enzymes are structurally more flexible and functionally more diverse, two counterdefensive allelochemical-metabolizing cytochrome P450 proteins, CYP6B1 from the specialist Papilio polyxenes, feeding on furanocoumarin-containing plants, and CYP6B8 from the generalist Helicoverpa zea, feeding on hundreds of host plant species, are compared structurally and functionally. Molecular modeling indicates that CYP6B8 has more flexible overall folding, a more elastic catalytic pocket, and one more substrate access channel than CYP6B1. Baculovirus-mediated expression of the CYP6B8 and CYP6B1 proteins de

SUBMITTER: Li X 

PROVIDER: S-EPMC365724 | biostudies-literature | 2004 Mar

REPOSITORIES: biostudies-literature