TY - JOUR
T1 - A class V chitinase from Arabidopsis thaliana
T2 - Gene responses, enzymatic properties, and crystallographic analysis
AU - Ohnuma, Takayuki
AU - Numata, Tomoyuki
AU - Osawa, Takuo
AU - Mizuhara, Mamiko
AU - Lampela, Outi
AU - Juffer, A. H.
AU - Skriver, Karen
AU - Fukamizo, Tamo
N1 - Funding Information:
Acknowledgments This work was partly supported by a grant to O.L. from the North Ostrobothnia Regional Fund of the Finnish Cultural Foundation. The authors thank the beam-line staffs at BL-17A of KEK (Ibaraki, Japan) for technical assistance during data collection, and Hideko Inanaga of AIST for technical assistance on protein crystallography.
PY - 2011/7
Y1 - 2011/7
N2 - Expression of a class V chitinase gene (At4g19810, AtChiC) in Arabidopsis thaliana was examined by quantitative real-time PCR and by analyzing microarray data available at Genevestigator. The gene expression was induced by the plant stress-related hormones abscisic acid (ABA) and jasmonic acid (JA) and by the stress resulting from the elicitor flagellin, NaCl, and osmosis. The recombinant AtChiC protein was produced in E. coli, purified, and characterized with respect to the structure and function. The recombinant AtChiC hydrolyzed N-acetylglucosamine oligomers producing dimers from the non-reducing end of the substrates. The crystal structure of AtChiC was determined by the molecular replacement method at 2. 0 Å resolution. AtChiC was found to adopt an (β/α)8 fold with a small insertion domain composed of an α-helix and a five-stranded β-sheet. From docking simulation of AtChiC with pentameric substrate, the amino acid residues responsible for substrate binding were found to be well conserved when compared with those of the class V chitinase from Nicotiana tabacum (NtChiV). All of the structural and functional properties of AtChiC are quite similar to those obtained for NtChiV, and seem to be common to class V chitinases from higher plants.
AB - Expression of a class V chitinase gene (At4g19810, AtChiC) in Arabidopsis thaliana was examined by quantitative real-time PCR and by analyzing microarray data available at Genevestigator. The gene expression was induced by the plant stress-related hormones abscisic acid (ABA) and jasmonic acid (JA) and by the stress resulting from the elicitor flagellin, NaCl, and osmosis. The recombinant AtChiC protein was produced in E. coli, purified, and characterized with respect to the structure and function. The recombinant AtChiC hydrolyzed N-acetylglucosamine oligomers producing dimers from the non-reducing end of the substrates. The crystal structure of AtChiC was determined by the molecular replacement method at 2. 0 Å resolution. AtChiC was found to adopt an (β/α)8 fold with a small insertion domain composed of an α-helix and a five-stranded β-sheet. From docking simulation of AtChiC with pentameric substrate, the amino acid residues responsible for substrate binding were found to be well conserved when compared with those of the class V chitinase from Nicotiana tabacum (NtChiV). All of the structural and functional properties of AtChiC are quite similar to those obtained for NtChiV, and seem to be common to class V chitinases from higher plants.
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U2 - 10.1007/s00425-011-1390-3
DO - 10.1007/s00425-011-1390-3
M3 - Article
C2 - 21390509
AN - SCOPUS:79959507253
SN - 0032-0935
VL - 234
SP - 123
EP - 137
JO - Planta
JF - Planta
IS - 1
ER -