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1lmq

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[[Image:1lmq.gif|left|200px]]
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{{Seed}}
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[[Image:1lmq.png|left|200px]]
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{{STRUCTURE_1lmq| PDB=1lmq | SCENE= }}
{{STRUCTURE_1lmq| PDB=1lmq | SCENE= }}
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'''THE CRYSTAL STRUCTURES OF THREE COMPLEXES BETWEEN CHITOOLIGOSACCHARIDES AND LYSOZYME FROM THE RAINBOW TROUT'''
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===THE CRYSTAL STRUCTURES OF THREE COMPLEXES BETWEEN CHITOOLIGOSACCHARIDES AND LYSOZYME FROM THE RAINBOW TROUT===
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==Overview==
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Like all c-type lysozymes, those from rainbow trout act as 1,4-beta-acetyl-muramidases to destroy bacteria by cleaving the polysaccharide chains of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) units in the cell walls. Lysozymes also hydrolyse chitin, the analogous N-acetylglucosamine polymer. The rainbow trout enzymes have been shown to be particularly effective in bacterial defence. We have determined the crystal structures of three complexes between rainbow trout lysozyme (RBTL) and the chito-oligosaccharides (NAG)(2), (NAG)(3) and (NAG)(4) to resolutions of 1.8, 2.0 and 1.6 A, respectively. Crystals of these complexes were obtained by co-crystallization, and intensity data were collected on a FAST area detector system. Refinement and model building gave final R values of 16.6, 15.9 and 16.5% for the di-, tri- and tetrasaccharide complexes, respectively. The results show that the chito-oligosaccharides bind to sites A, B and C as previously observed for complexes between the hen egg-white lysozyme (HEWL) and a variety of saccharides. The NAG ring in site D is not bound so deeply and is only slightly distorted towards a half-chair conformation as observed for the equivalent NAM residue in HEWL. From our results, there is reason to question the position and the degree of strain of the D saccharide and the mode of binding and importance of two saccharides in sites E and F for correct orientation of sugar D and effective hydrolysis of a productive substrate-lysozyme complex. Simple model building study from our structures implies a 'left-sided' binding mode of (NAG)(6) in the lower part of the active site of RBTL.
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The line below this paragraph, {{ABSTRACT_PUBMED_15299765}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 15299765 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15299765}}
==About this Structure==
==About this Structure==
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[[Category: Hough, E.]]
[[Category: Hough, E.]]
[[Category: Karlsen, S.]]
[[Category: Karlsen, S.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 00:04:22 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 21:26:31 2008''

Revision as of 18:26, 2 July 2008

Image:1lmq.png

Template:STRUCTURE 1lmq

THE CRYSTAL STRUCTURES OF THREE COMPLEXES BETWEEN CHITOOLIGOSACCHARIDES AND LYSOZYME FROM THE RAINBOW TROUT

Template:ABSTRACT PUBMED 15299765

About this Structure

1LMQ is a Single protein structure of sequence from Oncorhynchus mykiss. Full crystallographic information is available from OCA.

Reference

Crystal structures of three complexes between chito-oligosaccharides and lysozyme from the rainbow trout. How distorted is the NAG sugar in site D?, Karlsen S, Hough E, Acta Crystallogr D Biol Crystallogr. 1995 Nov 1;51(Pt 6):962-78. PMID:15299765

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