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Journal of Molecular Evolution

, Volume 21, Issue 2, pp 112–125 | Cite as

Aligning amino acid sequences: Comparison of commonly used methods

  • D. F. Feng
  • M. S. Johnson
  • R. F. Doolittle
Article

Summary

We examined two extensive families of protein sequences using four different alignment schemes that employ various degrees of “weighting” in order to determine which approach is most sensitive in establishing relationships. All alignments used a similarity approach based on a general algorithm devised by Needleman and Wunsch. The approaches included a simple program, UM (unitary matrix), whereby only identities are scored; a scheme in which the genetic code is used as a basis for weighting (GC); another that employs a matrix based on structural similarity of amino acids taken together with the genetic basis of mutation (SG); and a fourth that uses the empirical log-odds matrix (LOM) developed by Dayhoff on the basis of observed amino acid replacements. The two sequence families examined were (a) nine different globins and (b) nine different tyrosine kinase-like proteins. It was assumed a priori that all members of a family share common ancestry. In cases where two sequences were more than 30% identical, alignments by all four methods were almost always the same. In cases where the percentage identity was less than 20%, however, there were often significant differences in the alignments. On the average, the Dayhoff LOM approach was the most effective in verifying distant relationships, as judged by an empirical “jumbling test.” This was not universally the case, however, and in some instances the simple UM was actually as good or better. Trees constructed on the basis of the various alignments differed with regard to their limb lengths, but had essentially the same branching orders. We suggest some reasons for the different effectivenesses of the four approaches in the two different sequence settings, and offer some rules of thumb for assessing the significance of sequence relationships.

Key words

Amino acid sequence alignment Tyrosine kinases Globins Homologies 

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • D. F. Feng
    • 1
  • M. S. Johnson
    • 1
  • R. F. Doolittle
    • 1
  1. 1.Department of ChemistryUniversity of CaliforniaSan Diego, La JollaUSA

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