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Acta Crystallographica Section F: Structural Biology and Crystallization Communications (1)
BMC Biochemistry (1)
Fukamizo, Tamo (2)
Ohnuma, Takayuki (2)
Brzezinski, Ryszard (1)
Fortin, Mélanie (1)
Lacombe-Harvey, Marie-Ève (1)
Letzel, Thomas (1)
Numata, Tomoyuki (1)
Osawa, Takuo (1)
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A highly conserved arginine residue of the chitosanase from Streptomyces sp. N174 is involved both in catalysis and substrate binding
Streptomyces sp. N174 chitosanase (CsnN174), a member of glycoside hydrolases family 46, is one of the most extensively studied chitosanases. Previous studies allowed identifying several key residues of this inverting enzyme, such as the two catalytic carboxylic amino acids as well as residues that are involved in substrate binding. In spite of the progress in understanding the catalytic mechanism of this chitosanase, the function of some residues highly conserved throughout GH46 family has not been fully elucidated. This study focuses on one of such residues, the arginine 42.
Mutation of Arg42 into any other amino acid resulted in a drastic loss of enzyme activity. Detailed investigations of R42E and R42K chitosanases revealed that the mutant enzymes are not only impaired in their catalytic activity but also in their mode of interaction with the substrate. Mutated enzymes were more sensitive to substrate inhibition and were altered in their pattern of activity against chitosans of various degrees of deacetylation. Our data show that Arg42 plays a dual role in CsnN174 activity.
Arginine 42 is essential to maintain the enzymatic function of chitosanase CsnN174. We suggest that this arginine is influencing the catalytic nucleophile residue and also the substrate binding mode of the enzyme by optimizing the electrostatic interaction between the negatively charged carboxylic residues of the substrate binding cleft and the amino groups of GlcN residues in chitosan.
Chitosanase; Glycoside hydrolase family GH46; Substrate inhibition; Inverting mechanism; Enzyme-substrate interaction; Arginine
Crystallization and preliminary X-ray diffraction analysis of a class V chitinase from Nicotiana tabacum
Acta Crystallographica Section F: Structural Biology and Crystallization Communications
N. tabacum class V chitinase has been crystallized. X-ray diffraction data were collected to 1.2 Å resolution using a synchrotron-radiation source.
The plant chitinases, which have been implicated in self-defence against pathogens, are divided into at least five classes (classes I, II, III, IV and V). Although the crystal structures of several plant chitinases have been solved, no crystal structure of a class V chitinase has been reported to date. Here, the crystallization of Nicotiana tabacum class V chitinase (NtChiV) using the vapour-diffusion method is reported. The NtChiV crystals diffracted to 1.2 Å resolution using synchrotron radiation at the Photon Factory. The crystals belonged to the orthorhombic space group P21212, with unit-cell parameters a = 62.4, b = 120.3, c = 51.9 Å. The asymmetric unit of the crystals is expected to contain one molecule.
Nicotiana tabacum; defence proteins; class V chitinases
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