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. 1992 Apr 11;20(7):1637–1642. doi: 10.1093/nar/20.7.1637

A single amino acid change restores DNA cytosine methyltransferase activity in a cloned chlorella virus pseudogene.

Y Zhang 1, M Nelson 1, J L Van Etten 1
PMCID: PMC312249  PMID: 1579454

Abstract

The chlorella virus PBCV-1 contains an open reading frame, named P17-ORF4, which differs by eight amino acids from a DNA cytosine methyltransferase, M.CviJI, encoded by a different chlorella virus IL-3A. Whereas IL-3A expresses M.CviJI, which methylates the central cytosine in (A/G)GC(T/C/G) sequences, P17-ORF4 is non-functional. Gene fusions between P17-ORF4 and M.CviJI and site-directed point mutations revealed that changing Gln188 to Lys188 abolishes M.CviJI methyltransferase activity. Conversely, changing Lys188 in P17-ORF4 to Gln188 results in M.CviJI activity. The other altered seven amino acids do not appear to affect M.CviJI activity.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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