iciA, an Escherichia coli gene encoding a specific inhibitor of chromosomal initiation of replication in vitro.
The gene encoding the protein that binds the three 13-mers in the origin (oriC) of Escherichia coli to block initiation of replication in vitro has been cloned, sequenced, and overexpressed. The gene possesses an open reading frame for 297 amino acids (mass of 33,471 Da). The protein has a motif for DNA-binding (helix-turn-helix) and has homology to a diverse set of prokaryotic regulatory proteins, known as the LysR family. The protein, previously referred to as the 33-kDa protein, has been named IciA (for inhibitor of chromosome initiation). The iciA gene is at 62.8 min on the chromosomal map. Cells with enhanced levels of the protein grow at a normal rate but generally exhibit a pronounced lag upon transfer to a fresh medium.
Thöny
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B
Department of Biochemistry, Stanford University School of Medicine, CA 94305-5307.
Hwang
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Fradkin
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Kornberg
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A
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002876:Chromosomes, Bacterial; D003001:Cloning, Molecular; D004261:DNA Replication; D004268:DNA-Binding Proteins / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D015870:Gene Expression; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D016133:Polymerase Chain Reaction; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid
D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C068863:argP protein, E coli