Ubiquitin D (UBD)

Ubiquitin D is a protein encoded by the UBD gene.Using selective cDNA hybridization of a YAC containing the HLA-F locus  region on chromosome 6, followed by Southern and Northern blot analyses, Fan et al. (1996) isolated a cDNA, which they called 1F12, encoding a protein similar to diubiquitin. The 1.1-kb transcript was detected only in B-cell lines transformed by Epstein-Barr virus.By subtractive hybridization of dendritic cell (DC) libraries and EST database searching, Bates et al. (1997) obtained a full-length cDNA encoding diubiquitin. The predicted 165-amino acid protein has 2 ubiquitin-like domains, each of which has 2 cysteines. Southern blot analysis indicated that the cDNA represents a single-copy gene.