2KEJ | pdb_00002kej

Solution structure of a dimer of LAC repressor DNA-binding domain complexed to its natural operator O2

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
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)
A	d2keja_	All alpha proteins	lambda repressor-like DNA-binding domains	lambda repressor-like DNA-binding domains	GalR/LacI-like bacterial regulator	Lac repressor (LacR), N-terminal domain	(Escherichia coli K-12 ) [TaxId: 83333 ],	SCOPe (2.08)
B	d2kejb_	All alpha proteins	lambda repressor-like DNA-binding domains	lambda repressor-like DNA-binding domains	GalR/LacI-like bacterial regulator	Lac repressor (LacR), N-terminal domain	(Escherichia coli K-12 ) [TaxId: 83333 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	lambda C1 repressor DNA-binding domain-like	8037209	3000119	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	lambda C1 repressor DNA-binding domain-like	8037209	3000119	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)
A	Ras	e2kejA1	A: a/b three-layered sandwiches	X: HTH	H: Nudix	T: Nudix	F: Ras	ECOD (v294.1)
B	Ras	e2kejB1	A: a/b three-layered sandwiches	X: HTH	H: Nudix	T: Nudix	F: Ras	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.260.40	Mainly Alpha	Orthogonal Bundle	434 Repressor (Amino-terminal Domain)	lambda repressor-like DNA-binding domains	CATH (4.3.0)
B	1.10.260.40	Mainly Alpha	Orthogonal Bundle	434 Repressor (Amino-terminal Domain)	lambda repressor-like DNA-binding domains	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF00356	Bacterial regulatory proteins, lacI family (LacI)	Bacterial regulatory proteins, lacI family		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D	DNA (5'-D(PCPGPGPTPTPGPTPTPAPCPTPCPGPCPTPCPAPCPAPTPTPTP*C)-3')	-	-	-
C	DNA (5'-D(GPAPAPAPTPGPTPGPAPGPCPGPAPGPTPAPAPCPAPAPCPCP*G)-3')	-	-	-
A, B	Lactose operon repressor	DNA binding sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding binding double-stranded DNA binding nucleic acid binding cis-regulatory region sequence-specific DNA binding transcription regulatory region nucleic acid binding transcription regulator activity DNA-binding transcription factor activity identical protein binding protein binding DNA-binding transcription repressor activity	regulation of cellular process negative regulation of biological process RNA metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of cellular process negative regulation of biological process RNA metabolic process regulation of primary metabolic process negative regulation of RNA biosynthetic process RNA biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription nucleic acid biosynthetic process regulation of RNA metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process negative regulation of macromolecule metabolic process regulation of biosynthetic process negative regulation of DNA-templated transcription regulation of biological process negative regulation of metabolic process biological regulation primary metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process metabolic process cellular process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription regulation of metabolic process negative regulation of RNA metabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR046335	Transcriptional regulator LacI/GalR-like, sensor domain	Domain
A, B	IPR000843	LacI-type HTH domain	Domain
A, B	IPR028082	Periplasmic binding protein-like I	Homologous Superfamily
A, B	IPR010982	Lambda repressor-like, DNA-binding domain superfamily	Homologous Superfamily

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.