In:
Bioscience, Biotechnology, and Biochemistry, Informa UK Limited, Vol. 80, No. 1 ( 2016-01-02), p. 135-144
Abstract:
The collagenase activity and the fpcol gene were examined in Flavobacterium psychrophilum isolates from cold-water disease (CWD)-affected ayu, Plecoglossus altivelis. Collagenase expression was closely related to the accumulated mortality of CWD-affected ayu. RT-qPCR and bacterial challenge experiments showed that F. psychrophilum ayu isolate WA-1 expressed the fpcol gene more actively and was more virulent than ayu isolate WA-2. The amago (Oncorhynchus masou) isolate WB-1, which possesses a pseudo-fpcol gene, was not harmful to ayu. Hitherto, the well-studied metalloproteases Fpp1 and Fpp2 have been considered virulence factors. However, the most virulent isolate against ayu (WA-1) showed no Fpp activity because of a deletion mutation or an insertion of a transposon in the fpp genes. The less virulent WA-2 isolate showed only Fpp1 activity. Taken together, these results suggest that collagenolytic activity, but not Fpp activity, is related to the virulence of F. psychrophilum isolates in CWD-affected ayu.
Type of Medium:
Online Resource
ISSN:
0916-8451
,
1347-6947
DOI:
10.1080/09168451.2015.1079477
Language:
English
Publisher:
Informa UK Limited
Publication Date:
2016
detail.hit.zdb_id:
2110940-0
SSG:
12
