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Published on: June 30, 2011
Xenin: the oldest after insulin?
Alexander T Maryanovich1, Dmitry Yu Kormilets2, Andrey D Polyanovsky3
1Mechinkov Northwestern State Medical University, St. Petersburg, Russia. atm52@mail.ru.
Abstract:
Xenin is a regulatory peptide first isolated from the human gastric mucosa. Using an open-access protein database MEDLINE (33 million molecules; 11 billion amino acid residues) and our original computer program, we conducted a search for the xenin motifs in the primary structure of proteins across almost the entire taxonomic range of evolution. Motifs with 40% homology to human xenin are already present in prokaryotes. Homology reaches 84-96% in single-cell algae and plants, becoming complete since bony fishes. We suppose that this regulatory peptide is more ancient and significant than is usually thought.
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