Cloning and molecular characterization of the first aquatic hyaluronidase, SFHYA1, from the venom of stonefish (Synanceja horrida).
We report here for the first time the molecular characterization of a hyaluronidase from an aquatic source. SFHYA1 is the hyaluronidase found in the venom gland of stonefish, Synanceja horrida. Using a cDNA segment amplified with degenerate oligonucleotides based on the amino acid sequences of a conserved region in testicular-type hyaluronidases and a tryptic fragment of SFHYA1, clones encoding the precursor of this enzyme were isolated from a cDNA library prepared from stonefish venom glands. The deduced amino acid sequence of SFHYA1 shows that SFHYA1 is expressed as a precursor peptide with a 28-residue signal peptide for targeting it into endoplasmic reticulum. Mature SFHYA1 is a polypeptide composed of 449 residues containing three potential N-glycosylation sites, four putative hyaluronan-binding motifs [B(X)7B] and various residues implicated in substrate binding and catalysis. This cDNA was expressed in an active form in insect-cells but not in E. coli. Homology-based computational analyses suggested that SFHYA1 closely resembles the PH-20 family of hyaluronidases.
Ng
Hian Cheong
HC
Department of Biochemistry, Faculty of Medicine, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
Ranganathan
Shoba
S
Chua
Kim Lee
KL
Khoo
Hoon Eng
HE
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers; D018076:DNA, Complementary; D005399:Fishes / Q000235:genetics*; D006821:Hyaluronoglucosaminidase / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid
D017931:DNA Primers; D018076:DNA, Complementary; D006821:Hyaluronoglucosaminidase