Diversity of staphylocoagulase and identification of novel variants of staphylocoagulase gene in Staphylococcus aureus

Microbiology and Immunology - Tập 52 Số 7 - Trang 334-348 - 2008
Marie Kinoshita1,2, Nobumichi Kobayashi1, Shigeo Nagashima1, Masaho Ishino1, Seiko Otokozawa1, Keiji Mise1, Ayako Sumi1, Hiroyuki Tsutsumi2, Nobuyuki Uehara3, Naoki Watanabe3, Miyoko Endo4
1Hygiene
2Pediatrics
3Clinical Laboratory Medicine, Sapporo Medical University School of Medicine, Sapporo
4Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan

Tóm tắt

ABSTRACT

Staphylocoagulase (SC) is a major phenotypic determinant of Staphylococcus aureus. Serotype of SC (coagulase type) is used as an epidemiological marker and 10 types (I–X) have been discriminated so far. To clarify genetic diversity of SC within a single and among different serotype(s), we determined approximately 1500 bp‐nucleotide sequences of SC gene encoding D1, D2, and central regions (N‐terminal half and central regions of SC; SCNC) for a total of 33 S. aureus strains comprising two to three strains from individual coagulase types (I–VIII, X) and 10 strains which were not determined as previously known SC serotypes (ND‐strains). Amino acid sequence identities of SCNC among strains with a single coagulase type of II, III, IV, V, VI and X were extremely high (more than 99%), whereas lower identity (56–87%) was observed among different types. In contrast, within a single coagulase type of I, VII, or VIII, sequence divergence was found (lowest identity; 82%). SCNC sequences from the ND‐strains were discriminated into two genetic groups with an identity of 71% to each other (tentatively assigned to genotypes [XI] and [XII]), and exhibited less than 86% sequence identities to those of most known coagulase types. All the types [XI] and [XII] strains were methicillin susceptible and belonged to different sequence types from those of coagulase types I–X strains reported so far by multilocus sequence typing. These findings indicated genetic heterogeneity of SC in coagulase types I, VII, and VIII strains, and the presence of two novel SC genotypes related to antigenicity of SC serotypes.

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Microbiology and Immunology

Tập 52 Số 7

334-348

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