Annotations: 2FJR

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2 Family	LexA endopeptidase domain-like	8045611	4000321	SCOP2 (2022-06-29)
B	SCOP2 Family	XRE-like regulatory proteins	8048928	4000362	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	LexA/Signal peptidase-like	8091063	3000103	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	lambda C1 repressor DNA-binding domain-like	8091064	3000119	SCOP2 (2022-06-29)
A	SCOP2B Superfamily	lambda C1 repressor DNA-binding domain-like	8091064	3000119	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	LexA/Signal peptidase-like	8091063	3000103	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)
B	Pyr_redox_dim	e2fjrB3	A: alpha bundles	X: DEATH domain	H: Ten stranded beta/alpha barrel	T: Ten stranded beta/alpha barrel	F: Pyr_redox_dim	ECOD (develop294)
A	Phage_CI_C	e2fjrA1	A: alpha bundles	X: Globin-like	H: Globin-like	T: Globin-like	F: Phage_CI_C	ECOD (develop294)
A	Peptidase_M18	e2fjrA2	A: alpha bundles	X: Globin-like	H: Globin-like	T: Globin-like	F: Peptidase_M18	ECOD (develop294)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.260.40	Mainly Alpha	Orthogonal Bundle	434 Repressor (Amino-terminal Domain)	lambda repressor-like DNA-binding domains	CATH (4.3.0)
B	2.10.109.10	Mainly Beta	Ribbon	Umud Fragment, subunit A	Umud Fragment, subunit A	CATH (4.3.0)
A	1.10.260.40	Mainly Alpha	Orthogonal Bundle	434 Repressor (Amino-terminal Domain)	lambda repressor-like DNA-binding domains	CATH (4.3.0)
A	2.10.109.10	Mainly Beta	Ribbon	Umud Fragment, subunit A	Umud Fragment, subunit A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF07022	Bacteriophage CI repressor helix-turn-helix domain (Phage_CI_repr)	Bacteriophage CI repressor helix-turn-helix domain	This family consists of several phage CI repressor proteins and related bacterial sequences. The CI repressor is known to function as a transcriptional switch, determining whether transcription is lytic or lysogenic [1].	Domain
A, B	PF16452	Bacteriophage CI repressor C-terminal domain (Phage_CI_C)	Bacteriophage CI repressor C-terminal domain	The C-terminal domain of the CI repressor functions in oligomer formation [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Repressor protein CI	DNA binding binding nucleic acid binding	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 component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein complex oligomerization protein-containing complex assembly cellular component organization or biogenesis	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR032499	Bacteriophage CI repressor, C-terminal	Domain
A, B	IPR010982	Lambda repressor-like, DNA-binding domain superfamily	Homologous Superfamily
A, B	IPR010744	Bacteriophage CI repressor, N-terminal	Domain

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.