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. 1995 Mar 25;23(6):910–916. doi: 10.1093/nar/23.6.910

Determination of the origin cleavage and joining domain of geminivirus Rep proteins.

F Heyraud-Nitschke 1, S Schumacher 1, J Laufs 1, S Schaefer 1, J Schell 1, B Gronenborn 1
PMCID: PMC306784  PMID: 7731803

Abstract

Replication of the single-stranded DNA genome of plant geminiviruses follows a rolling circle mechanism. It strictly depends on a 'rolling circle replication initiator protein', the M(r) 41 kDa viral Rep protein, encoded by the C1 or AC1 genes. Using wheat dwarf virus (WDV) and tomato yellow leaf curl virus (TYLCV) as examples, we show that not only the full-size Rep proteins, but also a putative 30 kDa translation product of WDV open reading frame C1-N as well as an artificially shortened 24 kDa Rep of TYLCV, cleave and join single-stranded origin DNA in vitro. Thus the pivotal origin recognition and processing activities of geminivirus Rep proteins must be mediated by the amino-terminal domain of Rep.

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Selected References

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