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Molecular and Cellular Biology, December 1999, p. 8211-8218, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

In Vivo Activity of Murine De Novo Methyltransferases, Dnmt3a and Dnmt3b

Chih-Lin Hsieh*

Department of Urology and Department of Biochemistry and Molecular Biology, University of Southern California, Norris Cancer Center, Los Angeles, California 90033

Received 8 July 1999/Returned for modification 3 September 1999/Accepted 8 September 1999

The putative de novo methyltransferases, Dnmt3a and Dnmt3b, were reported to have weak methyltransferase activity in methylating the 3' long terminal repeat of Moloney murine leukemia virus in vitro. The activity of these enzymes was evaluated in vivo, using a stable episomal system that employs plasmids as targets for DNA methylation in human cells. De novo methylation of a subset of the CpG sites on the stable episomes is detected in human cells overexpressing the murine Dnmt3a or Dnmt3b1 protein. This de novo methylation activity is abolished when the cysteine in the P-C motif, which is the catalytic site of cytosine methyltransferases, is replaced by a serine. The pattern of methylation on the episome is nonrandom, and different regions of the episome are methylated to different extents. Furthermore, Dnmt3a also methylates the sequence methylated by Dnmt3a on the stable episome in the corresponding chromosomal target. Overexpression of human DNMT1 or murine Dnmt3b does not lead to the same pattern or degree of de novo methylation on the episome as overexpression of murine Dnmt3a. This finding suggests that these three enzymes may have different targets or requirements, despite the fact that weak de novo methyltransferase activity has been demonstrated in vitro for all three enzymes. It is also noteworthy that both Dnmt3a and Dnmt3b proteins coat the metaphase chromosomes while displaying a more uniform pattern in the nucleus. This is the first evidence that Dnmt3a and Dnmt3b have de novo methyltransferase function in vivo and the first indication that the Dnmt3a and Dnmt3b proteins may have preferred target sites.

* Mailing address: Department of Urology and Department of Biochemistry and Molecular Biology, University of Southern California, 1441 Eastlake Ave., Rm. 5420, Norris Cancer Center, Mail Stop 73, Los Angeles, CA 90033. Phone: (323) 865-0567. Fax: (323) 865-3019. E-mail: hsieh_c{at}froggy.hsc.usc.edu.

Molecular and Cellular Biology, December 1999, p. 8211-8218, Vol. 19, No. 12
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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