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RKP, a RING finger E3 ligase induced by BSCTV C4 protein, affects geminivirus infection by regulation of the plant cell cycle.

Plant J.2009 Mar;57(5):905-17. Epub 2008 Dec 04
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摘要


The C4 protein from Curtovirus is known as a major symptom determinant, but the mode of action of the C4 protein remains unclear. To understand the mechanism of involvement of C4 protein in virus-plant interactions, we introduced the C4 gene from Beet severe curly top virus (BSCTV) into Arabidopsis under a conditional expression promoter; the resulting overexpression of BSCTV C4 led to abnormal host cell division. RKP, a RING finger protein, which is a homolog of the human cell cycle regulator KPC1, was discovered to be induced by BSCTV C4 protein. Mutation of RKP reduced the susceptibility to BSCTV in Arabidopsis and impaired BSCTV replication in plant cells. Callus formation is impaired in rkp mutants, indicating a role of RKP in the plant cell cycle. RKP was demonstrated to be a functional ubiquitin E3 ligase and is able to interact with cell-cycle inhibitor ICK/KRP proteins in vitro. Accumulation of the protein ICK2/KRP2 was found increased in the rkp mutant. The above results strengthen the possibility that RKP might regulate the degradation of ICK/KRP proteins. In addition, the protein level of ICK2/KRP2 was decreased upon BSCTV infection. Overexpression of ICK1/KRP1 in Arabidopsis could reduce the susceptibility to BSCTV. In conclusion, we found that RKP is induced by BSCTV C4 and may affect BSCTV infection by regulating the host cell cycle.

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