2CJL

CRYSTAL STRUCTURE AND ENZYMATIC PROPERTIES OF A BACTERIAL FAMILY 19 CHITINASE REVEAL DIFFERENCES WITH PLANT ENZYMES

Summary for 2CJL

• Entry DOI: 10.2210/pdb2cjl/pdb
• Descriptor: SECRETED CHITINASE, ZINC ION (3 entities in total)
• Functional Keywords: hydrolase, plant enzymes
• Biological source: STREPTOMYCES COELICOLOR
• Total number of polymer chains: 2
• Total formula weight: 44219.55

Authors

Hoell, I.A.,Dalhus, B.,Heggset, E.B.,Aspmo, S.I.,Eijsink, V.G.H. (deposition date: 2006-04-04, release date: 2006-10-04, Last modification date: 2024-11-13)

Primary citation

Hoell, I.A.,Dalhus, B.,Heggset, E.B.,Aspmo, S.I.,Eijsink, V.G.H.
Crystal Structure and Enzymatic Properties of a Bacterial Family 19 Chitinase Reveal Differences with Plant Enzymes
FEBS J., 273:4889-, 2006

PubMed Abstract: We describe the cloning, overexpression, purification, characterization and crystal structure of chitinase G, a single-domain family 19 chitinase from the Gram-positive bacterium Streptomyces coelicolor A3(2). Although chitinase G was not capable of releasing 4-methylumbelliferyl from artificial chitooligosaccharide substrates, it was capable of degrading longer chitooligosaccharides at rates similar to those observed for other chitinases. The enzyme was also capable of degrading a colored colloidal chitin substrate (carboxymethyl-chitin-remazol-brilliant violet) and a small, presumably amorphous, subfraction of alpha-chitin and beta-chitin, but was not capable of degrading crystalline chitin completely. The crystal structures of chitinase G and a related Streptomyces chitinase, chitinase C [Kezuka Y, Ohishi M, Itoh Y, Watanabe J, Mitsutomi M, Watanabe T & Nonaka T (2006) J Mol Biol358, 472-484], showed that these bacterial family 19 chitinases lack several loops that extend the substrate-binding grooves in family 19 chitinases from plants. In accordance with these structural features, detailed analysis of the degradation of chitooligosaccharides by chitinase G showed that the enzyme has only four subsites (- 2 to + 2), as opposed to six (- 3 to + 3) for plant enzymes. The most prominent structural difference leading to reduced size of the substrate-binding groove is the deletion of a 13-residue loop between the two putatively catalytic glutamates. The importance of these two residues for catalysis was confirmed by a site-directed mutagenesis study.

PubMed: 17010167
DOI: 10.1111/J.1742-4658.2006.05487.X

Experimental method

X-RAY DIFFRACTION (1.5 Å)