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- W2116234584 abstract "Molecular evolutionary analyses of mammalian ribonucleases have shown that gene duplication events giving rise to three paralogous genes occurred in ruminant ancestors. One of these genes encodes a ribonuclease identified in bovine brain. A peculiar feature of this enzyme and orthologous sequences in other ruminants are C-terminal extensions consisting of 17-27 amino acid residues. Evidence was obtained by Western blot analysis for the presence of brain-type ribonucleases in brain tissue not only of ox, but also of sheep, roe deer and chevrotain (Tragulus javanicus), a member of the earliest diverged taxon of the ruminants. The C-terminal extension of brain-type ribonuclease from giraffe deviates much in sequence from orthologues in other ruminants, due to a change of reading frame. However, the gene encodes a functional enzyme, which could be expressed in heterologous systems. The messenger RNA of bovine brain ribonuclease is not only expressed at a high level in brain tissue but also in lactating mammary gland. The enzyme was isolated and identified from this latter tissue, but was not present in bovine milk, although pancreatic ribonucleases A and B could be isolated from both sources. This suggests different ways of secretion of the two enzyme types, possibly related to structural differences. The sequence of the brain-type RNase from chevrotain suggests that the C-terminal extensions of ruminant brain-type ribonucleases originate from deletions in the ancestral DNA (including a region with stop codons), followed by insertion of a 5-8-fold repeated hexanucleotide sequence, coding for a proline-rich polypeptide." @default.
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- W2116234584 date "2001-05-01" @default.
- W2116234584 modified "2023-09-27" @default.
- W2116234584 title "Ruminant brain ribonucleases: expression and evolution" @default.
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- W2116234584 doi "https://doi.org/10.1016/s0167-4838(01)00173-x" @default.
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