Molecular Biology and Evolution, Vol 12, 53-61, Copyright © 1995 by Society for Molecular Biology and Evolution
S Yokoyama
An important unanswered question in phototransduction is how visual
pigments (VPs) regulate their wavelength of maximal absorption (lambda
max). By constructing the evolutionary tree for 28 opsins with known lambda
max values, we can identify the times and directions of lambda max shift of
different VPs. A total of 55 amino acid changes are shown to correlate with
the directions of lambda max shift and might have been important in
determining lambda max of a VP. Among these, three amino acid changes are
already proven to be responsible in modifying the green-sensitive VP to the
red-sensitive VP. The present evolutionary analysis opens a new direction
in understanding the mechanism for the regulation of wavelength absorption
by a VP and, more generally, in studying molecular mechanism involved in
adaptive evolution.
ORIGINAL ARTICLE
Amino acid replacements and wavelength absorption of visual pigments in vertebrates
Department of Biology, Syracuse University, New York 13214.
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