Molecular Biology and Evolution, Vol 3, 262-275, Copyright © 1986 by Society for Molecular Biology and Evolution
JJ Beintema, WM Fitch and A Carsana
Amino acid sequences of 39 mammalian ribonucleases have been used to
construct trees by the maximum parsimony procedure. These trees are in
fairly good agreement with the biological classification of the species
involved. In the branching order of the six investigated eutherian
mammalian orders, the edentates diverge first, followed, probably, by the
primates. No definite conclusions can be drawn about the order of
divergence of the perissodactyls, the rodents, and the group consisting of
artiodactyls plus cetaceans. Nucleic acid sequences of part of the
messenger RNAs of rat pancreatic and bovine seminal ribonuclease were
compared. Both messengers have a second stop codon at position 129, which
is in agreement with the addition of four residues at the C- terminus in
several other ribonucleases. Turtle pancreatic ribonuclease and human
angiogenin differ from each other and from the mammalian ribonucleases at
55%-70% of the amino acid positions; they share a number of structural
features. Mammalian nonsecretory ribonucleases are homologous to the
pancreatic ribonucleases in sequence regions where the active-site
histidine residues are located.
ORIGINAL ARTICLE
Molecular evolution of pancreatic-type ribonucleases
Biochemisch Laboratorium, Rijkuniversiteit, Groningen, The Netherlands.
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