title: Cloning and expression of the carboxypeptidase gene from Aspergillus saitoi and determination of the catalytic residues by site-directed mutagenesis.
abstract: Carboxypeptidase from Aspergillus saitoi removes acidic, neutral and basic amino acids as well as proline from the C-terminal position at pH 2-5. cpdS, a cDNA encoding A. saitoi carboxypeptidase, was cloned and expressed. Analysis of the 1816-nucleotide sequence revealed a single open reading frame coding for 523 amino acids. When A. saitoi carboxypeptidase cDNA was expressed in yeast cells, carboxypeptidase activity was detected in the cell extract and was immunostained with a 72 kDa protein with polyclonal anti-(A. saitoi carboxypeptidase) serum. The recombinant enzyme treated with glycopeptidase F migrated with an apparent molecular mass of 60 kDa on SDS/PAGE, which was the same as that of the de-N-glycosylated carboxypeptidase from A. saitoi. Site-directed mutagenesis of the cpdS indicated that Ser-153, Asp-357 and His-436 residues were essential for the enzymic catalysis. It can be concluded that A. saitoi carboxypeptidase has a catalytic triad comprising Asp-His-Ser and is a member of serine carboxypeptidase family (EC 3.4.16.1).
authors.affiliation: Department of Applied Biological Chemistry, Faculty of Agriculture, Tohoku University, Sendai, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Chiba
authors.forename: T
authors.initials: T
authors.lastname: Midorikawa
authors.forename: E
authors.initials: E
authors.lastname: Ichishima
mesh_terms: D000595:Amino Acid Sequence; D001230:Aspergillus / Q000201:enzymology*; D001483:Base Sequence; D001665:Binding Sites; D015153:Blotting, Western; D002268:Carboxypeptidases / Q000235:genetics*; D017931:DNA Primers / Q000737:chemistry; D018076:DNA, Complementary / Q000235:genetics; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal; D006023:Glycoproteins / Q000737:chemistry / Q000276:immunology / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016297:Mutagenesis, Site-Directed; D012333:RNA, Messenger / Q000235:genetics; D012441:Saccharomyces cerevisiae; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013329:Structure-Activity Relationship
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; D006023:Glycoproteins; D012333:RNA, Messenger; D002268:Carboxypeptidases