title: Extracellular proteins of Vibrio cholerae: nucleotide sequence of the structural gene (hlyA) for the haemolysin of the haemolytic El Tor strain 017 and characterization of the hlyA mutation in the non-haemolytic classical strain 569B.
abstract: The EI T or haemolysin, product of hlyA, is exported from Vibrio cholerae as a Mr 80,000 protein which can be subsequently cleaved to give two proteins of Mr 65,000 and 15,000. Nucleotide sequence analysis has demonstrated that hlyA encodes a protein of Mr 82,250 with a potential 18-amino-acid signal sequence. The non-haemolytic classical strain 569B has been shown to have a structural gene defect rather than a defect in secretion. By non-reciprocal recombination it was possible to transfer this defect onto a plasmid and show that a truncated hlyA product of Mr 27,000 is made in Escherichia coli K-12 minicells. Nucleotide sequence analysis demonstrates an 11-base-pair deletion which would result in a Mr 26,940 protein probably loosely associated with the membrane.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D004269:DNA, Bacterial; D004926:Escherichia coli / Q000235:genetics; D005796:Genes; D006460:Hemolysin Proteins / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009154:Mutation; D010957:Plasmids; D012045:Regulatory Sequences, Nucleic Acid; D013045:Species Specificity; D014169:Transformation, Bacterial; D014734:Vibrio cholerae / Q000235:genetics* / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D006460:Hemolysin Proteins