Abstract:
:Methylation of cytosines within the sequence CpG is essential for mouse development and has been linked to transcriptional suppression in vertebrate systems. Methyl-CpG binding proteins (MeCPs) 1 and 2 bind preferentially to methylated DNA and can inhibit transcription. The gene for MeCP2 has been cloned and a methyl-CpG binding domain (MBD) within it has been defined. A search of DNA sequence databases with the MBD sequence identified a human cDNA with potential to encode an MBD-like region. Sequencing of the complete cDNA revealed that the open reading frame also encodes two cysteine-rich domains that are found in animal DNA methyltransferases (DNMTs) and in the mammalian HRX protein (also known as MLL and All-1). HRX is related to Drosophila trithorax. The protein, known as Protein Containing MBD (PCM1), was expressed in bacteria and shown to bind specifically to methylated DNA. PCM1 also repressed transcription in vitro in a methylation-dependent manner. A polyclonal antibody raised against the protein was able to 'supershift' the native MeCP11 complex from HeLa cells, indicating that PCM1 is a component of mammalian MeCP1.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Cross SH,Meehan RR,Nan X,Bird Adoi
10.1038/ng0797-256subject
Has Abstractpub_date
1997-07-01 00:00:00pages
256-9issue
3eissn
1061-4036issn
1546-1718journal_volume
16pub_type
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