期刊
DEVELOPMENTAL CELL
卷 22, 期 6, 页码 1321-1329出版社
CELL PRESS
DOI: 10.1016/j.devcel.2012.03.009
关键词
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资金
- KWF [UU-2009-4516]
- ERC-StG KINSIGN
- EMBO
- Marie-Curie Excellence Grant
- NWO-VIDI
- UU-High Potential
- SNSF [PBBSP3-133408]
- Swiss National Science Foundation (SNF) [PBBSP3-133408] Funding Source: Swiss National Science Foundation (SNF)
Chromosomal stability is safeguarded by a mitotic checkpoint, of which BUB1 and Mad3/BUBR1 are core components. These paralogs have similar, but not identical, domain organization. We show that Mad3/BUBR1 and BUB1 paralogous pairs arose by nine independent gene duplications throughout evolution, followed by parallel subfunctionalization in which preservation of the ancestral, amino-terminal KEN box or kinase domain was mutually exclusive. In one exception, vertebrate BUBR1-defined by the KEN box preserved the kinase domain but allowed nonconserved degeneration of catalytic motifs. Although BUBR1 evolved to atypical pseudokinase in some vertebrates, it retained the catalytic triad in humans. However, we show that putative catalysis by human BUBR1 is dispensable for error-free chromosome segregation. Instead, residues that interact with ATP in conventional kinases are essential for conformational stability in BUBR1. We propose that parallel evolution of BUBR1 orthologs rendered its kinase function dispensable in vertebrates, producing an unusual, triad-containing pseudokinase.
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