7ZRA | pdb_00007zra

Crystal structure of E.coli LexA in complex with nanobody NbSOS1(Nb14497)

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth E]		e7zraE1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
H		e7zraH1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
G [auth F]		e7zraF1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
D [auth G]		e7zraG1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
B [auth C]		e7zraC1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
F [auth D]		e7zraD1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
E [auth B]		e7zraB1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)
A		e7zraA1	A: a/b three-layered sandwiches	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.1)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth E], D [auth G], G [auth F], H	Heavy Chain	IGHV1	-	lexa repressor	SAbDab (2026-04-10)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth E], D [auth G], G [auth F], H	Nanobody NbSOS1 (Nb14497)	-	-	-
A, B [auth C], E [auth B], F [auth D]	LexA repressor	DNA binding binding nucleic acid binding peptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity hydrolase activity serine-type endopeptidase activity catalytic activity endopeptidase 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 DNA replication DNA metabolic process cellular response to stimulus response to stimulus cellular response to stress DNA damage response response to stress DNA repair SOS response proteolysis protein metabolic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B [auth C], E [auth B], F [auth D]	IPR015927	Peptidase S24/S26A/S26B/S26C	Domain
A, B [auth C], E [auth B], F [auth D]	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily
A, B [auth C], E [auth B], F [auth D]	IPR050077	LexA repressor	Family
A, B [auth C], E [auth B], F [auth D]	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily
A, B [auth C], E [auth B], F [auth D]	IPR006199	LexA repressor, DNA-binding domain	Domain
A, B [auth C], E [auth B], F [auth D]	IPR039418	LexA-like	Domain
A, B [auth C], E [auth B], F [auth D]	IPR006200	Transcription regulator LexA	Family
A, B [auth C], E [auth B], F [auth D]	IPR036286	LexA/Signal peptidase-like superfamily	Homologous Superfamily
A, B [auth C], E [auth B], F [auth D]	IPR006197	Peptidase S24, LexA-like	Family

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.