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Protein Science, Vol 3, Issue 12 2340-2350, Copyright © 1994 by Cold Spring Harbor Laboratory Press

ARTICLE

Conserved sequence features of inteins (protein introns) and their use in identifying new inteins and related proteins

S. PIETROKOVSKI
Department of Structural Biology, The Weizmann Institute of Science, Rehovot 76100, Israel

Inteins (protein introns) are internal portions of protein sequences that are posttranslationally excised while the flanking regions are spliced together, making an additional protein product. Inteins have been found in a number of homologous genes in yeast, mycobacteria, and extreme thermophile archaebacteria. The inteins are probably multifunctional, autocatalyzing their own splicing, and some were also shown to be DNA endonucleases. The splice junction regions and two regions similar to homing endonucleases were thought to be the only common sequence features of inteins. This work analyzed all published intein sequences with recently developed methods for detecting weak, conserved sequence features. The methods complemented each other in the identification and assessment of several patterns characterizing the intein sequences. New intein conserved features are discovered and the known ones are quantitatively described and localized. The general sequence description of all the known inteins is derived from the motifs and their relative positions. The intein sequence description is used to search the sequence databases for intein-like proteins. A sequence region in a mycobacterial open reading frame possessing all of the intein motifs and absent from sequences homologous to both of its flanking sequences is identified as an intein. A newly discovered putative intein in red algae chloroplasts is found not to contain the endonuclease motifs present in all other inteins. The yeast HO endonuclease is found to have an overall intein-like structure and a few viral polyprotein cleavage sites are found to be significantly similar to the inteins amino-end splice junction motif. The intein features described may serve for detection of intein sequences.
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