Analysis of the structural gene encoding a hemolysin in Vibrio mimicus.

Abstract:

:An environmental isolate of V. mimicus, strain E-33, has been reported to produce and secrete a hemolysin of 63 kDa. The hemolysin is enterotoxic in test animals. The nucleotide sequence of the structural gene of the hemolysin was determined. We found a 2,232 bp open reading frame, which codes a peptide of 744 amino acids, with a calculated molecular weight of 83,903 Da. The sequence for the structural gene was closely related to the V. cholerae el tor hlyA gene, coding an exocellular hemolysin. The amino terminal amino-acid sequence of the 63 kDa hemolysin, purified from V. mimicus, was determined by the Edman degradation method and found to be NH2-S-V-S-A-N-N-V-T-N-N-N-E-T. This sequence is identified from S-152 to T-164 predicted from the nucleotide sequence. So, it seems that the mature hemolysin in V. mimicus is processed upon deleting the first 151 amino acids, and the molecular mass is 65,972 Da. Analyzing the deduced amino-acid sequence, we also found a potential signal sequence of 24 amino acids at the amino terminal. Our results suggest that, like V. cholerae hemolysin, two-step processing also exists in V. Mimicus hemolysin.

journal_name

Microbiol Immunol

authors

Rahman MM,Miyoshi S,Tomochika K,Wakae H,Shinoda S

doi

10.1111/j.1348-0421.1997.tb01183.x

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

169-73

issue

2

eissn

0385-5600

issn

1348-0421

journal_volume

41

pub_type

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