3B5T image
Entry Detail
PDB ID:
3B5T
Title:
Crystal Structure of Novel Immune-Type Receptor 10 Se-Met Extracellular Fragment Mutant N30D
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2007-10-26
Release Date:
2008-06-24
Method Details:
Experimental Method:
Resolution:
1.75 Å
R-Value Free:
0.21
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Novel immune-type receptor 10
Mutations:N30D
Chain IDs:A, B, C, D, E
Chain Length:111
Number of Molecules:5
Biological Source:Ictalurus punctatus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
A bony fish immunological receptor of the NITR multigene family mediates allogeneic recognition.
Immunity 29 228 237 (2008)
PMID: 18674935 DOI: 10.1016/j.immuni.2008.05.018

Abstact

Novel immune-type receptors (NITRs) comprise an exceptionally large, diversified family of activating and inhibitory receptors that has been identified in bony fish. Here, we characterized the structure of an activating NITR that is expressed by a cytotoxic natural killer (NK)-like cell line and that specifically binds an allogeneic B cell target. A single amino acid residue within the NITR immunoglobulin variable (V)-type domain accounts for specificity of the interaction. Structures solved by X-ray crystallography revealed that the V-type domains of NITRs form homodimers resembling rearranging antigen-binding receptor heterodimers. CDR1 elements of both subunits of NITR dimers form ligand-binding surfaces that determine specificity for the nonself target. In the evolution of immune function, it appears that a specific NK type of innate recognition may be mediated by a complex germline multigene family of V structures resembling those that are somatically diversified in adaptive immunological responses.

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