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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1984 Apr;81(8):2499–2503. doi: 10.1073/pnas.81.8.2499

Primary structural evidence that the H-2Dq region encodes at least three distinct gene products: Dq, Lq, and Rq.

E P Lillehoj, T H Hansen, D H Sachs, J E Coligan
PMCID: PMC345089  PMID: 6585810

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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