1xt5
Crystal Structure of VCBP3, domain 1, from Branchiostoma floridaeCrystal Structure of VCBP3, domain 1, from Branchiostoma floridae
Structural highlights
FunctionEvolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedAlthough the origins of genes encoding the rearranging binding receptors remain obscure, it is predicted that their ancestral forms were nonrearranging immunoglobulin-type domains. Variable region-containing chitin-binding proteins (VCBPs) are diversified immune-type molecules found in amphioxus (Branchiostoma floridae), an invertebrate that diverged early in deuterostome phylogeny. To study the potential evolutionary relationships between VCBPs and vertebrate adaptive immune receptors, we solved the structures of both a single V-type domain (to 1.15 A) and a pair of V-type domains (to 1.85 A) from VCBP3. The deduced structures show integral features of the ancestral variable-region fold as well as unique features of variable-region pairing in molecules that may reflect characteristics of ancestral forms of diversified immune receptors found in modern-day vertebrates. Ancient evolutionary origin of diversified variable regions demonstrated by crystal structures of an immune-type receptor in amphioxus.,Hernandez Prada JA, Haire RN, Allaire M, Jakoncic J, Stojanoff V, Cannon JP, Litman GW, Ostrov DA Nat Immunol. 2006 Aug;7(8):875-82. Epub 2006 Jun 25. PMID:16799561[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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