Molecular Biology and Evolution, Vol 13, 666-673, Copyright © 1996 by Society for Molecular Biology and Evolution
JL Thorne, N Goldman and DT Jones
An evolutionary model that combines protein secondary structure and amino
acid replacement is introduced. It allows likelihood analysis of aligned
protein sequences and does not require the underlying secondary (or
tertiary) structures of these sequences to be known. One component of the
model describes the organization of secondary structure along a protein
sequence and another specifies the evolutionary process for each category
of secondary structure. A database of proteins with known secondary
structures is used to estimate model parameters representing these two
components. Phylogeny, the third component of the model, can be estimated
from the data set of interest. As an example, we employ our model to
analyze a set of sucrose synthase sequences. For the evolution of sucrose
synthase, a parametric bootstrap approach indicates that our model is
statistically preferable to one that ignores secondary structure.
ORIGINAL ARTICLE
Combining protein evolution and secondary structure
Statistics Department, North Carolina State University, Raleigh 27695- 8203, USA. thorne@stat.ncsu.edu
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