PMID: 1630899Jul 11, 1992Paper

Conserved sequence motifs in the initiator proteins for rolling circle DNA replication encoded by diverse replicons from eubacteria, eucaryotes and archaebacteria

Nucleic Acids Research
T V Ilyina, Eugene V Koonin

Abstract

An amino acid motif was identified that consists of the sequence HisHydrHisHydrHydrHydr (Hydr--bulky hydrophobic residue) and is conserved in two vast classes of proteins, one of which is involved in initiation and termination of rolling circle DNA replication, or RCR (Rep proteins), and the other in mobilization (conjugal transfer) of plasmid DNA (Mob proteins). Based on analogies with metalloenzymes, it is hypothesized that the two conserved His residues in this motif may be involved in metal ion coordination required for the activity of the Rep and Mob proteins. Rep proteins contained two additional conserved motifs, one of which was located upstream, and the other downstream from the 'two His' motif. The C-terminal motif encompassed the Tyr residue(s) forming the covalent link with nicked DNA. Mob proteins were characterized by the opposite orientation of the conserved motifs, with the (putative) DNA-linking Tyr being located near their N-termini. Both Rep and Mob protein classes further split into several distinct families. Although it was not possible to find a motif or pattern that would be unique for the entire Rep or Mob class, unique patterns were derived for large subsets of the proteins of each class. These observat...Continue Reading

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