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2hcz

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{{STRUCTURE_2hcz| PDB=2hcz | SCENE= }}
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'''Crystal structure of EXPB1 (Zea m 1), a beta-expansin and group-1 pollen allergen from maize'''
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===Crystal structure of EXPB1 (Zea m 1), a beta-expansin and group-1 pollen allergen from maize===
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==Overview==
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Expansins are small extracellular proteins that promote turgor-driven extension of plant cell walls. EXPB1 (also called Zea m 1) is a member of the beta-expansin subfamily known in the allergen literature as group-1 grass pollen allergens. EXPB1 induces extension and stress relaxation of grass cell walls. To help elucidate expansin's mechanism of wall loosening, we determined the structure of EXPB1 by x-ray crystallography to 2.75-A resolution. EXPB1 consists of two domains closely packed and aligned so as to form a long, shallow groove with potential to bind a glycan backbone of approximately 10 sugar residues. The structure of EXPB1 domain 1 resembles that of family-45 glycoside hydrolase (GH45), with conservation of most of the residues in the catalytic site. However, EXPB1 lacks a second aspartate that serves as the catalytic base required for hydrolytic activity in GH45 enzymes. Domain 2 of EXPB1 is an Ig-like beta-sandwich, with aromatic and polar residues that form a potential surface for polysaccharide binding in line with the glycan binding cleft of domain 1. EXPB1 binds to maize cell walls, most strongly to xylans, causing swelling of the cell wall. Tests for hydrolytic activity by EXPB1 with various wall polysaccharides proved negative. Moreover, GH45 enzymes and a GH45-related protein called "swollenin" lacked wall extension activity comparable to that of expansins. We propose a model of expansin action in which EXPB1 facilitates the local movement and stress relaxation of arabinoxylan-cellulose networks within the wall by noncovalent rearrangement of its target.
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(as it appears on PubMed at http://www.pubmed.gov), where 16984999 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16984999}}
==About this Structure==
==About this Structure==
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[[Category: Yennawar, N H.]]
[[Category: Yennawar, N H.]]
[[Category: Domain 1 is a beta barrel and domain 2 is a immunoglobulin like beta-sandwich]]
[[Category: Domain 1 is a beta barrel and domain 2 is a immunoglobulin like beta-sandwich]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 06:08:14 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 13:16:47 2008''

Revision as of 10:16, 29 July 2008

Image:2hcz.png

Template:STRUCTURE 2hcz

Crystal structure of EXPB1 (Zea m 1), a beta-expansin and group-1 pollen allergen from maize

Template:ABSTRACT PUBMED 16984999

About this Structure

2HCZ is a Single protein structure of sequence from Zea mays. Full crystallographic information is available from OCA.

Reference

Crystal structure and activities of EXPB1 (Zea m 1), a beta-expansin and group-1 pollen allergen from maize., Yennawar NH, Li LC, Dudzinski DM, Tabuchi A, Cosgrove DJ, Proc Natl Acad Sci U S A. 2006 Oct 3;103(40):14664-71. Epub 2006 Sep 19. PMID:16984999

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