The Primary Structure of the Phosphatidylcholine-Exchange Protein from Bovine Liver.

The phosphatidylcholine exchange protein from bovine liver consists of a single polypeptide chain and has a blocked N terminus. The protein contains an estimated 244 amino acid residues in accordance with a determined molecular weight of 28 000. The protease from mouse submaxillaris gland cleaved the citraconylated and S-carboxymethylated derivative of the exchange protein at one specific site (Arg¹⁴-Glu¹⁵) close to the N terminus. Analysis of the two resulting peptides showed that N-acetyl-methionine was the N-terminal residue and gave the sequence of the first 41 residues. The modified protein was also fragmented with the protease from Staphylococcus aureus. The peptides isolated represented 88% of the protein; their sequences were determined by manual and automated Edman degradation. Alignment of a number of these peptides gave the complete sequence of the N-terminal half up to position 122. [ABSTRACT FROM AUTHOR]