title: Chitin binding protein (CBP21) in the culture supernatant of Serratia marcescens 2170.
abstract: A chitin binding protein (CBP21) 21 kDa in size, is a major protein in the culture supernatant when Serratia marcescens 2170 is grown in the presence of chitin. The gene (cbp) for CBP21 was found to be located in a region 1.5 kb downstream of the chiB gene encoding chitinase B. The cbp gene encodes a polypeptide of 197 amino acids with a calculated size of 21.6 kDa containing a putative signal sequence of 27 amino acids. Comparison of the amino acid sequence of the deduced polypeptide with that of other proteins showed that CBP21 is similar (45.3% amino acid identity) to CHB1 of Streptomyces olivaceoviridis. Purified CBP21 prepared from the periplasmic fraction of Escherichia coli carrying the cloned cbp gene showed its highest binding activity to squid chitin (beta-chitin) followed by colloidal chitin and regenerated chitin. Binding of CBP21 to regenerated chitin was affected by pH, in particular, low pH reduced binding activity markedly. The presence of similar chitin binding proteins in the distantly related microorganisms, Streptomyces and Serratia, suggests a wide distribution of this type of chitin binding protein in chitinolytic microorganisms.
authors.affiliation: Department of Biosystem Science, Graduate School of Science and Technology, Niigata University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Taiyoji
authors.forename: N
authors.initials: N
authors.lastname: Nikaidou
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D001483:Base Sequence; D002244:Carbon; D002352:Carrier Proteins / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D002686:Chitin / Q000378:metabolism*; D017077:Culture Media, Conditioned; D004269:DNA, Bacterial; D004926:Escherichia coli / Q000378:metabolism; D005798:Genes, Bacterial; D047908:Intracellular Signaling Peptides and Proteins; D008969:Molecular Sequence Data; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012706:Serratia marcescens / Q000235:genetics* / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D017077:Culture Media, Conditioned; D004269:DNA, Bacterial; D047908:Intracellular Signaling Peptides and Proteins; C111062:chitin-binding protein 21, Serratia marcescens; D002686:Chitin; D002244:Carbon