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Mol Cell Biol. 1990 July; 10(7): 3700-3708

Regulation of the mouse alpha A-crystallin gene: isolation of a cDNA encoding a protein that binds to a cis sequence motif shared with the major histocompatibility complex class I gene and other genes.

T Nakamura, D M Donovan, K Hamada, C M Sax, B Norman, J R Flanagan, K Ozato, H Westphal and J Piatigorsky

Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, Bethesda, Maryland 20892.

ABSTRACT

We have shown by site-directed mutagenesis that the sequence between positions -69 and -40 of the mouse alpha A-crystallin gene is crucial for tissue-specific gene expression in a transfected mouse lens epithelial cell line transformed with the early region of simian virus 40. Gel retardation experiments with synthetic oligodeoxynucleotides revealed a mouse lens nuclear protein which bound specifically to the palindromic sequence 5'-GGGAAATCCC-3' at positions -66 to -57 in the alpha A-crystallin promoter. By screening a bacteriophage lambda gt11 expression library of the transformed lens cells, we isolated a 2.5-kilobase-pair cDNA encoding a fusion protein which bound to this sequence and to the regulatory element of the major histocompatibility complex (MHC) class I gene. This cDNA hybridized to a 10-kilobase-pair polyadenylated RNA present in many different tissues, including lens. It encoded a protein, tentatively called alpha A-CRYBP1, containing at least two zinc fingers. alpha A-CRYBP1 is either homologous or very similar to the human nuclear proteins MBP-1 (Baldwin et al., Mol. Cell. Biol. 10:1406-1414, 1990), PRDII-BFI (Fan and Maniatis, Genes Dev. 4:29-42, 1990), and HIV-EP1 (Maekawa et al., J. Biol. Chem. 264:14591-14593, 1989), which bind to regulatory elements of the MHC class I, beta interferon, and human immunodeficiency virus genes, respectively. Our results suggest that the lens-specific alpha A-crystallin, MHC class I, beta interferon and other genes have a similar cis-acting DNA regulatory motif that shares alpha A-CRYBPI, MBP-1, PRDII-BF1, HIV-EP1, or other closely related proteins as trans-acting factors.

Mol Cell Biol. 1990 July; 10(7): 3700-3708




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