Purification and some properties of three chitinases from the seeds of rye (Secale cereale).
Three chitinases, designated RSC-a, -b, and -c, were purified from the seeds of rye (Secale cereal) using ammonium sulfate precipitation, CM-cellulose column chromatography, gel filtration on Sephadex G-75, and S-Sepharose column chromatography. RSC-a, -b, and -c are basic proteins having molecular masses of 33 kDa, 26 kDa, and 26 kDa, and isoelectric points of 9.7, 10, and > 10, respectively. RSC-b and -c were found to be homologous proteins having similar amino acid compositions and N-terminal sequences. RSC-a contains more Thr, Ser, Glu, Pro, Gly, and Cys than RSC-b and -c and has a different N-terminal sequence from them. They hydrolyze glycolchitin and colloidal chitin, but not cell walls of Micrococcus lysodeikticus. These enzymes are stable at pH 4-8 and their optimum pHs toward glycolchitin are 5.
Yamagami
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Laboratory of Protein Chemistry & Engineering, Faculty of Agriculture, Kyushu University, Fukuoka, Japan.
Funatsu
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D000595:Amino Acid Sequence; D002688:Chitinases / Q000302:isolation & purification* / Q000378:metabolism; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D004795:Enzyme Stability; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D008969:Molecular Sequence Data; D012434:Secale / Q000201:enzymology*; D013056:Spectrophotometry, Ultraviolet
D002688:Chitinases