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Molecular adaptation of a leaf-eating bird: stomach lysozyme of the hoatzin.
Department of Molecular and Cell Biology, University of California, Berkeley 94720.
This report describes a lysozyme expressed at high levels in the stomach of the hoatzin, the only known foregut-fermenting bird. Evolutionary comparison places it among the calcium-binding lysozymes rather than among the conventional types. Conventional lysozymes were recruited as digestive enzymes twice in the evolution of mammalian foregut fermenters, and these independently recruited lysozymes share convergent structural changes attributed to selective pressures in the stomach. Biochemical convergence and parallel amino acid replacements are observed in the hoatzin stomach lysozyme even though it has a different genetic origin from the mammalian examples and has undergone more than 300 million years of independent evolution.
PMID: 7815930 [PubMed - indexed for MEDLINE]
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Cited by 4 PubMed Central articles
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Bacterial community in the crop of the hoatzin, a neotropical folivorous flying bird.
Godoy-Vitorino F, Ley RE, Gao Z, Pei Z, Ortiz-Zuazaga H, Pericchi LR, Garcia-Amado MA, Michelangeli F, Blaser MJ, Gordon JI, et al.
Appl Environ Microbiol. 2008 Oct; 74(19):5905-12. Epub 2008 Aug 8.
[Appl Environ Microbiol. 2008]
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ReviewMechanistic approaches to the study of evolution: the functional synthesis.
Dean AM, Thornton JW.
Nat Rev Genet. 2007 Sep; 8(9):675-88.
[Nat Rev Genet. 2007]
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Origin of plant glycerol transporters by horizontal gene transfer and functional recruitment.
Zardoya R, Ding X, Kitagawa Y, Chrispeels MJ.
Proc Natl Acad Sci U S A. 2002 Nov 12; 99(23):14893-6. Epub 2002 Oct 23.
[Proc Natl Acad Sci U S A. 2002]
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