A novel role for RAD54: this host protein modulates geminiviral DNA replication

Kaliappan, Kosalai ; Choudhury, Nirupam Roy ; Suyal, Geetika ; Mukherjee, Sunil Kumar (2011) A novel role for RAD54: this host protein modulates geminiviral DNA replication The FASEB Journal . ISSN 0892-6638

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Official URL: http://www.fasebj.org/content/early/2011/12/13/fj....

Related URL: http://dx.doi.org/10.1096/fj.11-188508fj.11-188508

Abstract

Geminiviruses primarily encode only few factors, such as replication initiator protein (Rep), and need various host cellular machineries for rolling-circle replication (RCR) and/or recombination-dependent replication (RDR). We have identified a host factor, RAD54, in a screen for Rep-interacting partners and observed its role in DNA replication of the geminivirus mungbean yellow mosaic India virus (MYMIV). We identified the interacting domains ScRAD54 and MYMIV-Rep and observed that ScRAD54 enhanced MYMIV-Rep nicking, ATPase, and helicase activities. An in vitro replication assay demonstrated that the geminiviral DNA replication reaction depends on the viral Rep protein, viral origin of replication sequences, and host cell-cycle proteins. Rad54-deficient yeast nuclear extract did not support in vitro viral DNA replication, while exogenous addition of the purified ScRAD54 protein enhanced replication. The role of RAD54 in in planta replication was confirmed by the transient replication assay; i.e., agroinoculation studies. RAD54 is a well-known recombination/repair protein that uses its DNA-dependent ATPase activity in conjunction with several other host factors. However, this study demonstrates for the first time that the eukaryotic rolling-circle replicon depends on the RAD54 protein.-Kaliappan, K., Choudhury, N. R., Suyal, G., Mukherjee, S. K. A novel role for RAD54: this host protein modulates geminiviral DNA replication.

Item Type:Article
Source:Copyright of this article belongs to The Federation of American Societies for Experimental Biology.
Keywords:Electron Microscopy; RAD54; Rolling Circle; Yeast Nuclear Extract
ID Code:82344
Deposited On:10 Feb 2012 12:27
Last Modified:10 Feb 2012 12:27

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