The Escherichia coli SeqA protein.
The Escherichia coli SeqA protein contributes to regulation of chromosome replication by preventing re-initiation at newly replicated origins. SeqA protein binds to new DNA which is hemimethylated at the adenine of GATC sequences. Most of the cellular SeqA is found complexed with the new DNA at the replication forks. In vitro the SeqA protein binds as a dimer to two GATC sites and is capable of forming a helical fiber of dimers through interactions of the N-terminal domain. SeqA can also bind, with less affinity, to fully methylated origins and affect timing of "primary" initiations. In addition to its roles in replication, the SeqA protein may also act in chromosome organization and gene regulation.
Waldminghaus
Torsten
T
Department of Cell Biology, Institute for Cancer Research, The Norwegian Radium Hospital, Rikshospitalet, University of Oslo, 0310 Oslo, Norway.
Skarstad
Kirsten
K
D001425:Bacterial Outer Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D004261:DNA Replication / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins / Q000235:genetics* / Q000378:metabolism; D040461:Gene Components; D015964:Gene Expression Regulation, Bacterial / Q000235:genetics*; D008958:Models, Molecular; D009154:Mutation / Q000235:genetics; D055503:Protein Multimerization / Q000235:genetics
D001425:Bacterial Outer Membrane Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C089746:SeqA protein, E coli