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J. Biol. Chem., Vol. 264, Issue 2, 1115-1123, 01, 1989

Interphotoreceptor retinoid-binding protein. Gene characterization, protein repeat structure, and its evolution

DE Borst, TM Redmond, JE Elser, MA Gonda, B Wiggert, GJ Chader and JM Nickerson
Laboratory of Retinal Cell and Molecular Biology, National Eye Institute, Bethesda, Maryland 20892.

The gene for bovine interphotoreceptor retinoid-binding protein (IRBP) has been cloned, and its nucleotide sequence has been determined. The IRBP gene is about 11.6 kilobase pairs (kb) and contains four exons and three introns. It transcribed into a large mRNA of approximately 6.4 kb and translated into a large protein of 145,000 daltons. To prove the identity of the genomic clone, we determined the protein sequence of several tryptic and cyanogen bromide fragments of purified bovine IRBP protein and localized them in the protein predicted from its nucleotide sequence. There is a 4-fold repeat structure in the protein sequence with 30-40% sequence identity and many conservative substitutions between any two of the four protein repeats. The third and fourth repeats are the most similar pair. All three of the introns in the IRBP gene fall in the fourth protein repeat. Two of the exons, the first and the fourth, are large, 3173 and 2447 bases, respectively. The introns are each about 1.5-2.2 kb long. The human IRBP gene has a sequence that is similar to one of the introns from the bovine gene. The unexpected gene structure and protein repeat structure in the bovine gene lead us to propose a model for the evolution of the IRBP gene.
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