1igm
From Proteopedia
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[[Image:1igm.gif|left|200px]] | [[Image:1igm.gif|left|200px]] | ||
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'''THREE DIMENSIONAL STRUCTURE OF AN FV FROM A HUMAN IGM IMMUNOGLOBULIN''' | '''THREE DIMENSIONAL STRUCTURE OF AN FV FROM A HUMAN IGM IMMUNOGLOBULIN''' | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1IGM is a [[Single protein]] structure | + | 1IGM is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IGM OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Fan, Z C.]] | [[Category: Fan, Z C.]] | ||
[[Category: Guddat, L W.]] | [[Category: Guddat, L W.]] | ||
| - | [[Category: | + | [[Category: Immunoglobulin]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:58:34 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 16:58, 2 May 2008
THREE DIMENSIONAL STRUCTURE OF AN FV FROM A HUMAN IGM IMMUNOGLOBULIN
Overview
An IgM(kappa) immunoglobulin from a patient (Pot) with Waldenstrom's macroglobulinemia was hydrolyzed with pepsin to release a fragment consisting of the 'variable' (V) domains of the light and heavy chains plus eight residue 'tails' from the 'constant' (C) domains. The crystal structure of this fragment was determined at 2.3 A resolution by molecular replacement and crystallographic refinement methods. When examined separately, the light chain component closely resembles another human kappa chain (Rei) in both the beta-pleated sheet regions and the 'hypervariable' loops. The conserved pleated sheets in the heavy chain are similar to those in the human Kol IgG1 protein, but the third hypervariable loop in particular is different from that in any immunoglobulin structure described to date. As in the Kol protein, this loop blocks the access to any internal active site along the light-heavy chain interface. Unlike the Kol protein, however, the loop does not protrude beyond the boundaries of a conventional antigen combining site. Instead, it forms a very compact structure, which fills almost all residual space between the domains. This is an example of one dominant complementarity-determining region (CDR) essentially negating the diversity possible with five other CDRs in the two chains. Ordered water molecules are associated with light chain constituents along the interface, but not with CDR3 of the heavy chain. In screening exercises the Pot IgM failed to bind a wide variety of peptides. Together, the results suggest that ligand binding can only occur on external surfaces of the protein. These surfaces carry a limited number of side chains usually assigned to CDRs in more typical antibodies.
About this Structure
1IGM is a Single protein structure. Full crystallographic information is available from OCA.
Reference
Three-dimensional structure of an Fv from a human IgM immunoglobulin., Fan ZC, Shan L, Guddat LW, He XM, Gray WR, Raison RL, Edmundson AB, J Mol Biol. 1992 Nov 5;228(1):188-207. PMID:1447781 Page seeded by OCA on Fri May 2 19:58:34 2008
