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Purification, cDNA cloning, and characterization of plant chitinase with a novel domain combination from lycophyte Selaginella doederleinii.
Bioscience, Biotechnology, and Biochemistry 2018 October
Chitinase-A from a lycophyte Selaginella doederleinii (SdChiA), having molecular mass of 53 kDa, was purified to homogeneity by column chromatography. The cDNA encoding SdChiA was cloned by rapid amplification of cDNA ends and polymerase chain reaction. It consisted of 1477 nucleotides and its open reading frame encoded a polypeptide of 467 amino acid residues. The deduced amino acid sequence indicated that SdChiA consisted of two N-terminal chitin-binding domains and a C-terminal plant class V chitinase catalytic domain, belonging to the carbohydrate-binding module family 18 (CBM18) and glycoside hydrolase family 18 (GH18), respectively. SdChiA had chitin-binding ability. The time-dependent cleavage pattern of (GlcNAc)4 by SdChiA showed that SdChiA specifically recognizes the β-anomer in the + 2 subsite of the substrate (GlcNAc)4 and cleaves the glycoside bond at the center of the substrate. This is the first report of the occurrence of a family 18 chitinase containing CBM18 chitin-binding domains.
ABBREVIATIONS: AtChiC: Arabidopsis thaliana class V chitinase; CBB: Coomassie brilliant blue R250; CBM: carbohydrate binding module family; CrChi-A: Cycas revolute chitinase-A; EaChiA: Equisetum arvense chitinase-A; GH: glycoside hydrolase family, GlxChi-B: gazyumaru latex chitinase-B; GlcNAc: N-acetylglucosamine; HPLC: high performance liquid chromatography; LysM; lysin motif; MtNFH1: Medicago truncatula ecotypes R108-1 chitinase; NCBI: national center for biotechnology information; NF: nodulation factor; NtChiV: Nicotiana tabacum class V chitinase; PCR: polymerase chain reaction; PrChi-A: Pteris ryukyuensis chitinase-A; RACE: rapid amplification of cDNA ends; SDS-PAGE: sodium dodecyl sulfate-polyacrylamide gel electrophoresis; SdChiA: Selaginella doederleinii chitinase-A.
ABBREVIATIONS: AtChiC: Arabidopsis thaliana class V chitinase; CBB: Coomassie brilliant blue R250; CBM: carbohydrate binding module family; CrChi-A: Cycas revolute chitinase-A; EaChiA: Equisetum arvense chitinase-A; GH: glycoside hydrolase family, GlxChi-B: gazyumaru latex chitinase-B; GlcNAc: N-acetylglucosamine; HPLC: high performance liquid chromatography; LysM; lysin motif; MtNFH1: Medicago truncatula ecotypes R108-1 chitinase; NCBI: national center for biotechnology information; NF: nodulation factor; NtChiV: Nicotiana tabacum class V chitinase; PCR: polymerase chain reaction; PrChi-A: Pteris ryukyuensis chitinase-A; RACE: rapid amplification of cDNA ends; SDS-PAGE: sodium dodecyl sulfate-polyacrylamide gel electrophoresis; SdChiA: Selaginella doederleinii chitinase-A.
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