A FAMILY OF CYCLIN D-HOMOLOGS FROM PLANTS DIFFERENTIALLY CONTROLLED BY GROWTH-REGULATORS AND CONTAINING THE CONSERVED RETINOBLASTOMA PROTEIN-INTERACTION MOTIF

被引:320
作者
SONI, R [1 ]
CARMICHAEL, JP [1 ]
SHAH, ZH [1 ]
MURRAY, JAH [1 ]
机构
[1] UNIV CAMBRIDGE, INST BIOTECHNOL, CAMBRIDGE CB2 1QT, ENGLAND
基金
英国惠康基金;
关键词
D O I
10.1105/tpc.7.1.85
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A new family of three related cyclins has been identified in Arabidopsis by complementation of a yeast strain deficient in G(1) cyclins. Individual members show tissue-specific expression and are conserved in other plant species. They form a distinctive group of plant cyclins, which we named delta-type cyclins to indicate their similarities with mammalian D-type cyclins. The sequence relationships between delta and D cyclins include the N-terminal sequence LXCXE. This motif was originally identified in certain viral oncoproteins and is strongly implicated in binding to the retinoblastoma protein pRb. By analogy to mammalian cyclin D, these plant homologs may mediate growth and phytohormonal signals into the plant cell cycle. In support of this hypothesis, we show that, on restimulation of suspension-cultured cells, cyclin delta 3 is rapidly induced by the plant growth regulator cytokinin and cyclin delta 2 is induced by carbon source.
引用
收藏
页码:85 / 103
页数:19
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