1XRX

Crystal structure of a DNA-binding protein

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
D	d1xrxd_	All alpha proteins	Ribbon-helix-helix	Ribbon-helix-helix	SeqA N-terminal domain-like	SeqA	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
A	d1xrxa1	All alpha proteins	Ribbon-helix-helix	Ribbon-helix-helix	SeqA N-terminal domain-like	SeqA	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
B	d1xrxb_	All alpha proteins	Ribbon-helix-helix	Ribbon-helix-helix	SeqA N-terminal domain-like	SeqA	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
C	d1xrxc_	All alpha proteins	Ribbon-helix-helix	Ribbon-helix-helix	SeqA N-terminal domain-like	SeqA	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
D	SCOP2B Superfamily	Ribbon-helix-helix	8033873	3000295	SCOP2B (2022-06-29)
A	SCOP2 Family	SeqA N-terminal domain-like	8021493	4001307	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Ribbon-helix-helix	8033873	3000295	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Ribbon-helix-helix	8033873	3000295	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Ribbon-helix-helix	8033873	3000295	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D	SeqA_N	e1xrxD1	A: alpha arrays	X: HTH	H: HTH	T: Ribbon-helix-helix	F: SeqA_N	ECOD (1.6)
A	SeqA_N	e1xrxA1	A: alpha arrays	X: HTH	H: HTH	T: Ribbon-helix-helix	F: SeqA_N	ECOD (1.6)
B	SeqA_N	e1xrxB1	A: alpha arrays	X: HTH	H: HTH	T: Ribbon-helix-helix	F: SeqA_N	ECOD (1.6)
C	SeqA_N	e1xrxC1	A: alpha arrays	X: HTH	H: HTH	T: Ribbon-helix-helix	F: SeqA_N	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF17206	SeqA protein N-terminal domain (SeqA_N)	SeqA protein N-terminal domain	The binding of SeqA protein to hemimethylated GATC sequences is important in the negative modulation of chromosomal initiation at oriC, and in the formation of SeqA foci necessary for Escherichia coli chromosome segregation [3]. SeqA tetramers are ab ...	The binding of SeqA protein to hemimethylated GATC sequences is important in the negative modulation of chromosomal initiation at oriC, and in the formation of SeqA foci necessary for Escherichia coli chromosome segregation [3]. SeqA tetramers are able to aggregate or multimerise in a reversible, concentration-dependent manner [3]. Apart from its function in the control of DNA replication, SeqA may also be a specific transcription factor [4]. This short domain mediates dimerisation [5].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	SeqA protein	DNA binding sequence-specific DNA binding sequence-specific double-stranded DNA binding double-stranded DNA binding binding organic cyclic compound binding nucleic acid binding DNA replication origin binding identical protein binding protein binding protein homodimerization activity protein dimerization activity double-stranded methylated DNA binding hemi-methylated DNA-binding	regulation of cellular process cellular biosynthetic process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process organic substance metabolic process organic substance biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of cellular process cellular biosynthetic process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process organic substance metabolic process organic substance biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process cellular metabolic process biological regulation primary metabolic process regulation of cellular metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of cellular biosynthetic process organic cyclic compound metabolic process regulation of gene expression biosynthetic process organic cyclic compound biosynthetic process metabolic process regulation of macromolecule biosynthetic process cellular process regulation of DNA-templated transcription macromolecule metabolic process regulation of metabolic process regulation of DNA-templated DNA replication initiation negative regulation of biological process negative regulation of DNA-templated DNA replication initiation negative regulation of DNA-templated DNA replication negative regulation of nucleobase-containing compound metabolic process negative regulation of macromolecule metabolic process DNA-templated DNA replication negative regulation of DNA replication DNA replication initiation negative regulation of metabolic process DNA metabolic process DNA replication regulation of DNA-templated DNA replication negative regulation of DNA metabolic process regulation of DNA replication regulation of DNA metabolic process response to stimulus response to radiation response to abiotic stimulus cellular component organization organelle organization chromosome organization sister chromatid cohesion cellular component organization or biogenesis cell cycle cell cycle process nucleoid organization	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol protein-containing complex SeqA-DNA complex protein-DNA complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR005621	Negative modulator of initiation of replication SeqA	Family
A, B, C, D	IPR010985	Ribbon-helix-helix	Homologous Superfamily
A, B, C, D	IPR026577	Replication modulator SeqA, C-terminal DNA-binding domain	Domain
A, B, C, D	IPR036835	Replication modulator SeqA, C-terminal DNA-binding domain superfamily	Homologous Superfamily
A, B, C, D	IPR013321	Arc-type ribbon-helix-helix	Homologous Superfamily
A, B, C, D	IPR033761	Negative modulator of initiation of replication SeqA, N-terminal	Domain

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.