Analysis of the cDNA for phospholipase A sub(2) from honeybee venom glands. The deduced amino acid sequence reveals homology to the corresponding vertebrate enzymes

• Published in: European journal of biochemistry Vol. 184; no. 1; pp. 249 - 254
• Main Authors: Kuchler, K, Gmachl, M, Sippl, MJ, Kreil, G
• Format: Journal Article
• Language: English
• Published: 01.01.1989
• Subjects: Apidae; Apis mellifera; genes; Hymenoptera; venom gland
• ISSN: 0014-2956

A cDNA expression library was constructed from worker bee venom glands and screened with an antibody against phospholipase A sub(2). The nucleotide sequence of a positive clone with the largest insert showed an open reading frame that codes for part of the signal peptide, the pro-region and the entire mature enzyme of the bee venom phospholipase A sub(2) precursor. This sequence differs in the central region from the one determined by Shipolini et al. in showing, among other exchanges, two additional cysteines. The revised sequence of bee venom phospholipase is similar to the pancreatic enzyme in the spacing of cysteines and the presence of several amino acids known to be part of the active site or the Ca super(2+)-binding region in identical positions. Moreover, these parts of the bee protein can be fitted into the three-dimensional structure determined for the bovine pancreatic phospholipase A sub(2). Contrary to earlier suggestions, we therefore conclude that the bee venom enzyme shows some homology to phospholipases from mammalian pancreas and snake venoms.