1e1f: Difference between revisions

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[[Image:1e1f.jpg|left|200px]]
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[[Image:1e1f.png|left|200px]]


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{{STRUCTURE_1e1f|  PDB=1e1f  |  SCENE=  }}  
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'''CRYSTAL STRUCTURE OF A MONOCOT (MAIZE ZMGLU1) BETA-GLUCOSIDASE IN COMPLEX WITH P-NITROPHENYL-BETA-D-THIOGLUCOSIDE'''
===CRYSTAL STRUCTURE OF A MONOCOT (MAIZE ZMGLU1) BETA-GLUCOSIDASE IN COMPLEX WITH P-NITROPHENYL-BETA-D-THIOGLUCOSIDE===




==Overview==
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The maize beta-glucosidase isoenzymes ZMGlu1 and ZMGlu2 hydrolyse the abundant natural substrate DIMBOAGlc (2-O-beta-D-glucopyranosyl-4-hydroxy-7-methoxy-1,4-benzoxazin-3-one), whose aglycone DIMBOA (2,4-hydroxy-7-methoxy-1,4-benzoxazin-3-one) is the major defence chemical protecting seedlings and young plant parts against herbivores and other pests. The two isoenzymes hydrolyse DIMBOAGlc with similar kinetics but differ from each other and their sorghum homologues with respect to specificity towards other substrates. To gain insights into the mechanism of substrate (i.e. aglycone) specificity between the two maize isoenzymes and their sorghum homologues, ZMGlu1 was produced in Escherichia coli, purified, crystallized and its structure solved at 2.5 Angstrom resolution by X-ray crystallography. In addition, the complex of ZMGlu1 with the non-hydrolysable inhibitor p-nitrophenyl beta-D-thioglucoside was crystallized and, based on the partial electron density, a model for the inhibitor molecule within the active site is proposed. The inhibitor is located in a slot-like active site where its aromatic aglycone is held by stacking interactions with Trp-378. Whereas some of the atoms on the non-reducing end of the glucose moiety can be modelled on the basis of the electron density, most of the inhibitor atoms are highly disordered. This is attributed to the requirement of the enzyme to accommodate two different species, namely the substrate in its ground state and in its distorted conformation, for catalysis.
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{{ABSTRACT_PUBMED_11171077}}


==About this Structure==
==About this Structure==
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[[Category: Pnp-beta-d-thioglucoside]]
[[Category: Pnp-beta-d-thioglucoside]]
[[Category: Retention of the anomeric configuration]]
[[Category: Retention of the anomeric configuration]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 23:59:02 2008''

Revision as of 20:59, 30 June 2008

File:1e1f.png

Template:STRUCTURE 1e1f

CRYSTAL STRUCTURE OF A MONOCOT (MAIZE ZMGLU1) BETA-GLUCOSIDASE IN COMPLEX WITH P-NITROPHENYL-BETA-D-THIOGLUCOSIDE

Template:ABSTRACT PUBMED 11171077

About this Structure

1E1F is a Single protein structure of sequence from Zea mays. Full crystallographic information is available from OCA.

Reference

Crystal structure of a monocotyledon (maize ZMGlu1) beta-glucosidase and a model of its complex with p-nitrophenyl beta-D-thioglucoside., Czjzek M, Cicek M, Zamboni V, Burmeister WP, Bevan DR, Henrissat B, Esen A, Biochem J. 2001 Feb 15;354(Pt 1):37-46. PMID:11171077

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