Structural analysis and disulfide-bridge pairing of two odorant-binding proteins from Bombyx mori.

Pheromone-binding protein (PBP) and general odorant-binding proteins (GOBPs) were purified from the antennae of Bombyx mori and structurally characterised. The amino acid sequence of GOBP-2 has been corrected. The disulphide arrangements of PBP and GOBP-2 have been determined by a combined mass spectrometric/Edman degradation approach. The same cysteine pairings, Cys19-Cys54, Cys50-Cys108, and Cys97-Cys117, were found in both proteins, suggesting that such patterns occur commonly throughout this family of molecules. This arrangement of disulphide bonds indicates that the three-dimensional structure of insect OBPs is defined by three loops, rich in helical content, which can vary in size and charge distribution from one protein to another. Copyright 1999 Academic Press.