Expression of collagenase in Flavobacterium psychrophilum isolated from cold-water disease-affected ayu (Plecoglossus altivelis)

Bioscience, Biotechnology, and Biochemistry
Hitoshi NakayamaShunji Hattori

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.

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Citations

Nov 23, 2017·Frontiers in Microbiology·David Pérez-PascualEric Duchaud
Jan 13, 2019·Applied and Environmental Microbiology·T RochatE Duchaud
Jan 5, 2017·Bioscience, Biotechnology, and Biochemistry·Hitoshi NakayamaKenichi Amano

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Methods Mentioned

BETA
PCR
collagenase assay

Software Mentioned

BLAST
SDS

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