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J. Biol. Chem., Vol. 261, Issue 15, 6712-6718, 05, 1986

Structures of two HaeIII-type genes in the human salivary proline-rich protein multigene family

HS Kim and N Maeda

Two members of the human salivary proline-rich protein (PRP) multigene family have been isolated and completely sequenced. These PRP genes, PRH1 and PRH2, are of the HaeIII-type subfamily and code for acidic PRP proteins. Both genes are approximately 3.5 kilobase pairs (kb) in length and contain four exons. Exon 3 encodes the proline-rich part of the protein and includes five 63-base pair (bp) repeats. CAT and ATA boxes and several possible enhancer sequences occur in a 1-kb region 5' to exon 1. Two sets of repeats occur in the sequenced region in addition to the 63-bp repeats: one pair of about 140 bp flanks 500 bp of DNA in the first intervening sequence, and the other pair of 72 bp is tandemly repeated 1.4 kb 5' to the PRH1 gene. The 4-kb region of sequenced DNA from PRH1 differs by an average of 8.7% from the same region in PRH2, but the nucleotide sequences of the exon 3 of the two genes differ by only 0.2%. This result suggests the occurrence of a recent gene conversion event. The regions containing the 5-fold repeated sequences of 63 bp are identical in the two genes, PRH1 and PRH2. A comparison of the human HaeIII and BstNI subfamily repeats and a comparison of the human, mouse, and rat repeats suggest that the individual repeats have evolved in a concerted fashion within each gene and within the PRP gene family as a whole.
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