The sequence specificity domain of cytosine-C5 methylases.

AUTOR(ES)

Klimasauskas, S

RESUMO

Prokaryotic DNA[cytosine-C5]methyltransferases (m5C-methylases) share a common architectural arrangement of ten conserved sequence motifs. A series of eleven hybrids have been constructed between the HpaII (recognition sequence: Cm5CGG) and HhaI (recognition sequence: Gm5CGC) DNA-methylases. The hybrids were over-expressed in E.coli and their in vivo methylation phenotypes investigated. Six were inactive by our assay while five of them retained partial methylation activity and full specificity. In all five cases the specificity matched that of the parent methylase which contributed the so-called variable region, located between conserved motifs VIII and IX. This was the only sequence held in common between the active hybrids and for the first time provides unequivocal evidence that the specificity determinants of the mono-specific m5C-methylases are located within the variable region. Correlation of the hybrid methylase structure with the efficiency of methylation suggests that conserved motif IX may interact with the variable region whereas motif X most probably interacts with the N-terminal half of the molecule.

Documentos Relacionados

• Sequence motifs characteristic of DNA[cytosine-N4]methyltransferases: similarity to adenine and cytosine-C5 DNA-methylases.
• Sequence-specific and mechanism-based crosslinking of Dcm DNA cytosine-C5 methyltransferase of E. coli K-12 to synthetic oligonucleotides containing 5-fluoro-2'-deoxycytidine.
• Hybrid mouse–prokaryotic DNA (cytosine-5) methyltransferases retain the specificity of the parental C-terminal domain
• REBASE--restriction enzymes and methylases.
• REBASE-restriction enzymes and methylases.