1kx1
From Proteopedia
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'''Rat mannose protein A complexed with Man6-GlcNAc2-Asn''' | '''Rat mannose protein A complexed with Man6-GlcNAc2-Asn''' | ||
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[[Category: Park-Snyder, S.]] | [[Category: Park-Snyder, S.]] | ||
[[Category: Weis, W I.]] | [[Category: Weis, W I.]] | ||
| - | [[Category: | + | [[Category: C-type lectin]] |
| - | [[Category: | + | [[Category: Calcium-binding protein]] |
| - | [[Category: | + | [[Category: Lectin]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 23:16:28 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 20:16, 2 May 2008
Rat mannose protein A complexed with Man6-GlcNAc2-Asn
Overview
Mannose-binding proteins (MBPs) are C-type animal lectins that recognize high mannose oligosaccharides on pathogenic cell surfaces. MBPs bind to their carbohydrate ligands by forming a series of Ca(2+) coordination and hydrogen bonds with two hydroxyl groups equivalent to the 3- and 4-OH of mannose. In this work, the determinants of the orientation of sugars bound to rat serum and liver MBPs (MBP-A and MBP-C) have been systematically investigated. The crystal structures of MBP-A soaked with monosaccharides and disaccharides and also the structure of the MBP-A trimer cross-linked by a high mannose asparaginyl oligosaccharide reveal that monosaccharides or alpha1-6-linked mannose bind to MBP-A in one orientation, whereas alpha1-2- or alpha1-3-linked mannose binds in an orientation rotated 180 degrees around a local symmetry axis relating the 3- and 4-OH groups. In contrast, a similar set of ligands all bind to MBP-C in a single orientation. The mutation of MBP-A His(189) to its MBP-C equivalent, valine, causes Man alpha 1-3Man to bind in a mixture of orientations. These data combined with modeling indicate that the residue at this position influences the orientation of bound ligands in MBP. We propose that the control of binding orientation can influence the recognition of multivalent ligands. A lateral association of trimers in the cross-linked crystals may reflect interactions within higher oligomers of MBP-A that are stabilized by multivalent ligands.
About this Structure
1KX1 is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
Reference
Orientation of bound ligands in mannose-binding proteins. Implications for multivalent ligand recognition., Ng KK, Kolatkar AR, Park-Snyder S, Feinberg H, Clark DA, Drickamer K, Weis WI, J Biol Chem. 2002 May 3;277(18):16088-95. Epub 2002 Feb 15. PMID:11850428 Page seeded by OCA on Fri May 2 23:16:28 2008
