Primary structural evidence that the H-2Dq region encodes at least three distinct gene products: Dq, Lq, and Rq.
Primary structural evidence that the H-2Dq region encodes at least three distinct gene products: Dq, Lq, and Rq.
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H-2Dq 区域编码至少三种不同基因产物的主要结构证据：Dq、Lq 和 Rq。
DOI：
10.1073/pnas.81.8.2499
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发表时间：
1984
影响因子：
11.1
通讯作者：
Coligan,JE
中科院分区：
文献类型：
--
作者：
Lillehoj,EP;Hansen,TH;Sachs,DH;Coligan,JE
Class I gene products D, L, and R encoded by the D region of the H-2q haplotype were isolated by sequential immunoprecipitation from Nonidet P-40 extracts of B10.AKM murine spleen cells. Primary structural comparisons of these molecules were made by tryptic peptide map analyses and radiochemical amino acid sequence determinations. Partial NH2-terminal radiosequence analyses of the peptides generated by CNBr cleavage of these three molecules defined the Rq molecule as a gene product that is distinct from the Dq and Lq molecules. Comparative tryptic peptide map analyses of [3H]arginine-, [3H]lysine-, or [3H]mannose-labeled molecules were performed to determine if the Dq and Lq molecules could be distinguished. The two molecules were identical in their [3H]lysine-labeled peptides (17 in common) and [3H]mannose-labeled glycopeptides but could be differentiated by their [3H]arginine-labeled peptides (18 of 21 in common). These results suggest an amino acid sequence homology of 99% or greater between the Dq and Lq molecules. These data therefore provide structural evidence for three D region gene products and suggest that their antigenic differences are not due to post-translational glycosylation differences. Thus, the D region of the H-2q haplotype may provide an example of a relatively recent class I gene duplication, indicating that these genes are in a dynamic state of evolution through expansion or contraction of the gene pool.
