Nucleic Acids Research, Vol 25, Issue 6 1087-1093, Copyright © 1997 by Oxford University Press
FB Perler, GJ Olsen and E Adam
We have compiled a list of all the inteins (protein splicing elements)
whose sequences have been published or were available from on-line sequence
databases as of September 18, 1996. Analysis of the 36 available intein
sequences refines the previously described intein motifs and reveals the
presence of another intein motif, Block H. Furthermore, analysis of the new
inteins reshapes our view of the conserved splice junction residues, since
three inteins lack the intein penultimate His seen in prior examples.
Comparison of intein sequences suggests that, in general, (i) inteins
present in the same location within extein homologs from different
organisms are very closely related to each other in paired sequence
comparison or phylogenetic analysis and we suggest that they should be
considered intein alleles; (ii) multiple inteins present in the same gene
are no more similar to each other than to inteins present in different
genes; (iii) phylogenetic analysis indicates that inteins are so divergent
that trees with statistically significant branches cannot be generated
except for intein alleles.
ARTICLES
Compilation and analysis of intein sequences
New England Biolabs Inc., Beverly, MA 01915, USA. perler@neb.com
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