1zm1
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| , resolution 2.30Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Activity: | Licheninase, with EC number 3.2.1.73 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structures of complex F. succinogenes 1,3-1,4-beta-D-glucanase and beta-1,3-1,4-cellotriose
OverviewOverview
Fibrobacter succinogenes 1,3-1,4-beta-D-glucanase (Fsbeta-glucanase) catalyzes the specific hydrolysis of beta-1,4 glycosidic bonds adjacent to beta-1,3 linkages in beta-D-glucans or lichenan. This is the first report to elucidate the crystal structure of a truncated Fsbeta-glucanase (TFsbeta-glucanase) in complex with beta-1,3-1,4-cellotriose, a major product of the enzyme reaction. The crystal structures, at a resolution of 2.3 angstroms, reveal that the overall fold of TFsbeta-glucanase remains virtually unchanged upon sugar binding. The enzyme accommodates five glucose residues, forming a concave active cleft. The beta-1,3-1,4-cellotriose with subsites -3 to -1 bound to the active cleft of TFsbeta-glucanase with its reducing end subsite -1 close to the key catalytic residues Glu56 and Glu60. All three subsites of the beta-1,3-1,4-cellotriose adopted a relaxed C(1)4 conformation, with a beta-1,3 glycosidic linkage between subsites -2 and -1, and a beta-1,4 glycosidic linkage between subsites -3 and -2. On the basis of the enzyme-product complex structure observed in this study, a catalytic mechanism and substrate binding conformation of the active site of TFsbeta-glucanase is proposed.
About this StructureAbout this Structure
1ZM1 is a Single protein structure of sequence from Fibrobacter succinogenes. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of truncated Fibrobacter succinogenes 1,3-1,4-beta-D-glucanase in complex with beta-1,3-1,4-cellotriose., Tsai LC, Shyur LF, Cheng YS, Lee SH, J Mol Biol. 2005 Dec 2;354(3):642-51. Epub 2005 Sep 30. PMID:16246371
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