Modeling of the full-length Escherichia coli SeqA protein, in complex with DNA.
The Escherichia coli SeqA protein, a negative regulator of chromosome DNA replication, prevents the overinitiation of replication within one cell cycle by binding to hemimethylated GATC sequences in the replication origin, oriC. In addition to the hemimethylated DNA-binding activity, the SeqA protein has a self-association activity, which is also considered to be essential for its regulatory function in replication initiation. To study the SeqA protein biological activity, we performed a SeqA protein model to examine its architecture. SeqA has a bipartite structure composed of a large and small lobe. The SeqA spatial conformation contributes to its ability to bind to a pair of hemimethylated GATC sequences and to its cooperative behavior.
Laboratoire de biochimie et de biologie moléculaire, faculté des sciences de Bizerte, 7021 Zarzouna, Tunisia. douraid.daghfous@fst.rnu.tn
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Daghfous
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Chatti
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Hammami
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Landoulsi
D001425:Bacterial Outer Membrane Proteins / Q000737:chemistry* / Q000378:metabolism*; D004261:DNA Replication; D004269:DNA, Bacterial / Q000737:chemistry*; D004268:DNA-Binding Proteins / Q000737:chemistry* / Q000378:metabolism*; D019281:Dimerization; D004795:Enzyme Stability; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D029968:Escherichia coli Proteins / Q000737:chemistry* / Q000378:metabolism*; D008958:Models, Molecular; D011487:Protein Conformation; D017510:Protein Folding
D001425:Bacterial Outer Membrane Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C089746:SeqA protein, E coli