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. 1983 Jan;153(1):27–32. doi: 10.1128/jb.153.1.27-32.1983

Role of primary structure and disulfide bond formation in beta-lactamase secretion.

S Pollitt, H Zalkin
PMCID: PMC217338  PMID: 6336734

Abstract

Plasmid pBR322-encoded beta-lactamase was shown to contain a single disulfide bond, which caused the protein to migrate faster in sodium dodecyl sulfate-polyacrylamide gels than the fully reduced form. A similar difference in mobility of the in vitro synthesized precursor before and after reduction indicates that it also contained a disulfide bond. Formation of the disulfide bond in vivo, however, occurred concomitant with processing. In vivo accumulation of the precursor by inhibition of secretion did not allow disulfide bond formation to occur. This result is consistent with post-translational translocation of the precursor. Synthesis of a fragment of beta-lactamase lacking the carboxy terminus was obtained by insertion of a foreign DNA segment into the PstI site of bla. Processing and secretion of the protein did not appear to be greatly affected, indicating that the carboxy terminus is not required for secretion.

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