Abstract
The human X-linked phosphoglycerate kinase (PGK) gene, which is expressed in all somatic cells, was cloned and its structure was determined. The gene is interrupted by 10 introns and spans 23 kilobases. When projected on the three-dimensional structure of the PGK protein molecule, splice junctions are located between established peptide domains. In particular, an intron separates the two mononucleotide subdomains of the ATP-binding region, and additional introns divide each of these subdomains between their characteristic beta-strands. Similar correlations are found in the bipartite NAD-binding domains of alcohol dehydrogenase and glyceraldehyde-3-phosphate dehydrogenase. Furthermore, in each case the nucleotide-binding domain is separated from the catalytic domain by at least one intron. The homology of the exon organization in structurally similar regions of these three enzymes suggests that a nucleotide-binding domain evolved by gene duplication and was subsequently dispersed to different proteins through a process of intron-mediated recombination.
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Selected References
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