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1r8l

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{{STRUCTURE_1r8l| PDB=1r8l | SCENE= }}
{{STRUCTURE_1r8l| PDB=1r8l | SCENE= }}
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'''The structure of endo-beta-1,4-galactanase from Bacillus licheniformis'''
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===The structure of endo-beta-1,4-galactanase from Bacillus licheniformis===
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==Overview==
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The beta-1,4-galactanase from Bacillus licheniformis (BLGAL) is a plant cell-wall-degrading enzyme involved in the hydrolysis of beta-1,4-galactan in the hairy regions of pectin. The crystal structure of BLGAL was determined by molecular replacement both alone and in complex with the products galactobiose and galactotriose, catching a first crystallographic glimpse of fragments of beta-1,4-galactan. As expected for an enzyme belonging to GH-53, the BLGAL structure reveals a (betaalpha)(8)-barrel architecture. However, BLGAL betaalpha-loops 2, 7 and 8 are long in contrast to the corresponding loops in structures of fungal galactanases determined previously. The structure of BLGAL additionally shows a calcium ion linking the long betaalpha-loops 7 and 8, which replaces a disulphide bridge in the fungal galactanases. Compared to the substrate-binding subsites predicted for Aspergillus aculeatus galactanase (AAGAL), two additional subsites for substrate binding are found in BLGAL, -3 and -4. A comparison of the pattern of galactan and galactooligosaccharides degradation by AAGAL and BLGAL shows that, although both are most active on substrates with a high degree of polymerization, AAGAL can degrade galactotriose and galactotetraose efficiently, whereas BLGAL prefers longer oligosaccharides and cannot hydrolyze galactotriose to any appreciable extent. This difference in substrate preference can be explained structurally by the presence of the extra subsites -3 and -4 in BLGAL.
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{{ABSTRACT_PUBMED_15312766}}
==About this Structure==
==About this Structure==
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[[Category: Family 53]]
[[Category: Family 53]]
[[Category: Glycosyl hydrolase]]
[[Category: Glycosyl hydrolase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 04:59:32 2008''

Revision as of 01:59, 29 July 2008

Image:1r8l.png

Template:STRUCTURE 1r8l

The structure of endo-beta-1,4-galactanase from Bacillus licheniformis

Template:ABSTRACT PUBMED 15312766

About this Structure

Full crystallographic information is available from OCA.

Reference

The structure of endo-beta-1,4-galactanase from Bacillus licheniformis in complex with two oligosaccharide products., Ryttersgaard C, Le Nours J, Lo Leggio L, Jorgensen CT, Christensen LL, Bjornvad M, Larsen S, J Mol Biol. 2004 Jul 30;341(1):107-17. PMID:15312766

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