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. 1987 Jun;6(6):1677–1683. doi: 10.1002/j.1460-2075.1987.tb02417.x

Primary structure of the gene for the murine Ia antigen-associated invariant chains (Ii). An alternatively spliced exon encodes a cysteine-rich domain highly homologous to a repetitive sequence of thyroglobulin.

N Koch, W Lauer, J Habicht, B Dobberstein
PMCID: PMC553541  PMID: 3038530

Abstract

The gene for murine Ia-associated invariant (Ii) chains (Ii31 and Ii41) was characterized by sequence analysis. The gene extends over approximately 9 kb and is organized in nine exons. Exon 1 encodes the 5' untranslated region and the cytoplasmic segment, exon 2 the membrane spanning segment and adjacent amino acids and exons 3-8 the extracytoplasmic portion of Ii31. Putative promoter sequences were found upstream of the start of the coding sequence. Between exons 6 and 7 an additional, alternatively spliced exon 6b has been identified. This exon is spliced into the mRNA coding for the Ii-related Ii41 protein. Exon 6b encodes a cysteine-rich domain of 64 amino acids. It shows a remarkably high homology to the repetitive elements in thyroglobulin, a precursor for thyroid hormone. Based on this homology, it is suggested that this domain (TgR) in Tg and in Ii41 may play a role either in hormone formation or as a carrier in the transport of molecules (thyroid hormone or processed antigen respectively) between intracellular compartments.

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Selected References

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