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Genomic and functional characterization of the diverse immunoglobulin domain-containing protein (DICP) family

机译:包含多种免疫球蛋白域的蛋白质(DICP)家族的基因组和功能表征

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A heretofore-unrecognized multigene family encoding diverse immunoglobulin (Ig) domain-containing proteins (DICPs) was identified in the zebrafish genome. Twenty-nine distinct loci mapping to three chromosomal regions encode receptor-type structures possessing two classes of Ig ectodomains (D1 and D2). The sequence and number of Ig domains, transmembrane regions and signaling motifs vary between DICPs. Interindividual polymorphism and alternative RNA processing contribute to DICP diversity. Molecular models indicate that most D1 domains are of the variable (V) type; D2 domains are Ig-like. Sequence differences between D1 domains are concentrated in hypervariable regions on the front sheet strands of the Ig fold. Recombinant DICP Ig domains bind lipids, a property shared by mammalian CD300 and TREM family members. These findings suggest that novel multigene families encoding diversified immune receptors have arisen in different vertebrate lineages and affect parallel patterns of ligand recognition that potentially impact species-specific advantages.
机译:在斑马鱼基因组中鉴定出迄今未被识别的编码多种免疫球蛋白(Ig)域的蛋白质(DICPs)的多基因家族。映射到三个染色体区域的29个不同的基因座编码具有两类Ig胞外域(D1和D2)的受体类型结构。在DICPs之间,Ig结构域,跨膜区和信号基序的序列和数目不同。个体间的多态性和RNA的替代加工有助于DICP的多样性。分子模型表明,大多数D1结构域是可变的(V)类型。 D2域类似于Ig。 D1结构域之间的序列差异集中在Ig折叠的前片链上的高变区中。重组DICP Ig域结合脂质,这是哺乳动物CD300和TREM家族成员共有的特性。这些发现表明,在不同的脊椎动物谱系中出现了编码多种免疫受体的新颖的多基因家族,并影响配体识别的平行模式,这可能会影响物种特异性优势。

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