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5195038 
Journal Article 
Disulfide structure of the pheromone binding protein from the silkworm moth, Bombyx mori 
Leal, WS; Nikonova, L; Peng, G 
1999 
Yes 
FEBS Letters
ISSN: 0014-5793
EISSN: 1873-3468 
464 
1-2 
85-90 
English 
10611489 
CCC:000084654700017 
Disulfide bond formation is the only known posttranslational modification of insect pheromone binding proteins (PBPs). In the PBPs from moths (Lepidoptera), six cysteine residues are highly conserved at positions 19, 50, 54, 97, 108 and 117, but to date nothing is known about their respective linkage or redox status. We used a multiple approach of enzymatic digestion, chemical cleavage, partial reduction with Tris-(2-carboxyethyl)phosphine, followed by digestion with endoproteinase Lys-C to determine the disulfide connectivity in the PBP from Bombyx mori (BmPBP). Identification of the reaction products by on-line liquid chromatography-electrospray ionization mass spectrometry (LC/ESI-MS) and protein sequencing supported the assignment of disulfide bridges at Cys-19-Cys-54, Cys-50-Cys-108 and Cys-97-Cys-117. The disulfide linkages were identical in the protein obtained by periplasmic expression in Escherichia coli and in the native BmPBP. 
enzymatic digestion; disulfide linkage; carboxyamidomethyl; cysteine; armyworm mamestra-brassicae; molecular-cloning; bacterial expression; chemical cleavage; antheraea-pernyi; peptide-bonds; manduca-sexta; antennae; tryptophanyl