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Molecular cloning and functional analysis of Photobacterium damselae subsp. piscicida haem receptor gene
Author(s) -
Naka H,
Hirono I,
Aoki T
Publication year - 2005
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.2004.00601.x
Subject(s) - biology , gene , vibrio vulnificus , open reading frame , receptor , peptide sequence , microbiology and biotechnology , sequence analysis , mutant , biochemistry , molecular cloning , genetics , vibrionaceae , bacteria
A haem receptor gene from Photobacterium damselae subsp. piscicida (formerly known as Pasteurella piscicida ) has been cloned, sequenced and analysed for its function. The gene, designated as pph , has an open reading frame consisting of 2154 bp, a predicted 718 amino acid residues and exists as a single copy. It is homologous with the haem receptors of Vibrio anguillarum hupA , V. cholerae hutA , V. mimicus mhuA and V. vulnificus hupA at 32.7, 32.7, 45.6 and 30.9%, respectively, and is highly conserved, consisting of a Phe‐Arg‐Ala‐Pro sequence (FRAP), an iron transport related molecule (TonB) and a Asn‐Pron‐Asn‐Leu sequence (NPNL), binding motifs associated with haem receptors. As a single gene knockout mutant P. damselae subsp. piscicida was able to bind haem in the absence of pph , suggesting that other receptors may be involved in its iron transport system. This study shows that the P. damselae subsp. piscicida pph belongs to the haem receptor family, is conserved and that its iron‐binding system may involve more than one receptor.