3SXU | pdb_00003sxu

Structure of the E. coli SSB-DNA polymerase III interface

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
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	d3sxua_	Alpha and beta proteins (a/b)	DNA polymerase III chi subunit	DNA polymerase III chi subunit	DNA polymerase III chi subunit	automated matches	(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	DNA polymerase III chi subunit	8035680	3000660	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	DNA polymerase III psi subunit	8035684	3000417	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	DNA_pol3_chi	e3sxuA1	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: DNA_pol3_chi	ECOD (1.6)
B	DNA_III_psi	e3sxuB1	A: a/b three-layered sandwiches	X: DNA polymerase III psi subunit (From Topology)	H: DNA polymerase III psi subunit (From Topology)	T: DNA polymerase III psi subunit	F: DNA_III_psi	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.10110	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	DNA polymerase III subunit chi	CATH (4.3.0)
B	3.40.50.10220	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	DNA polymerase III, psi subunit	CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	DNA polymerase III subunit chi	catalytic activity, acting on DNA DNA-directed DNA polymerase activity DNA polymerase activity catalytic activity, acting on a nucleic acid transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups DNA binding binding nucleic acid binding	nucleobase-containing compound metabolic process DNA replication metabolic process cellular process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process response to stimulus response to radiation response to abiotic stimulus regulation of DNA-templated DNA replication initiation regulation of cellular process positive regulation of DNA replication nucleobase-containing compound metabolic process DNA replication metabolic process cellular process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process response to stimulus response to radiation response to abiotic stimulus regulation of DNA-templated DNA replication initiation regulation of cellular process positive regulation of DNA replication positive regulation of biological process regulation of primary metabolic process positive regulation of metabolic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process positive regulation of cellular process DNA-templated DNA replication regulation of biological process DNA replication initiation biological regulation regulation of macromolecule metabolic process positive regulation of DNA metabolic process regulation of DNA-templated DNA replication positive regulation of DNA-templated DNA replication regulation of metabolic process positive regulation of DNA-templated DNA replication initiation regulation of DNA replication regulation of DNA metabolic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex transferase complex intracellular membrane-bounded organelle DNA polymerase complex transferase complex, transferring phosphorus-containing groups intracellular organelle DNA polymerase III complex cellular anatomical structure organelle membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex transferase complex intracellular membrane-bounded organelle DNA polymerase complex transferase complex, transferring phosphorus-containing groups intracellular organelle DNA polymerase III complex cellular anatomical structure organelle DNA polymerase III, clamp loader complex intracellular protein-containing complex protein-DNA complex intracellular membraneless organelle chromosome membraneless organelle replication fork replisome
B	DNA polymerase III subunit psi	catalytic activity, acting on DNA DNA-directed DNA polymerase activity DNA polymerase activity catalytic activity, acting on a nucleic acid transferase activity nucleotidyltransferase activity catalytic activity transferase activity, transferring phosphorus-containing groups hydrolase activity, acting on ester bonds nuclease activity 3'-5' exonuclease activity hydrolase activity exonuclease activity	nucleobase-containing compound metabolic process DNA replication metabolic process cellular process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process response to stimulus response to radiation response to abiotic stimulus DNA-templated DNA replication	membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex transferase complex intracellular membrane-bounded organelle DNA polymerase complex transferase complex, transferring phosphorus-containing groups intracellular organelle DNA polymerase III complex cellular anatomical structure organelle membrane-bounded organelle protein-containing complex intracellular anatomical structure catalytic complex nucleus nuclear protein-containing complex transferase complex intracellular membrane-bounded organelle DNA polymerase complex transferase complex, transferring phosphorus-containing groups intracellular organelle DNA polymerase III complex cellular anatomical structure organelle DNA polymerase III, clamp loader complex intracellular protein-containing complex protein-DNA complex intracellular membraneless organelle chromosome membraneless organelle replication fork replisome
C	SSB peptide	enzyme regulator activity enzyme activator activity molecular function activator activity molecular function regulator activity identical protein binding protein binding binding DNA binding single-stranded DNA binding nucleic acid binding	nucleobase-containing compound metabolic process DNA replication metabolic process cellular process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process cellular response to stimulus mismatch repair response to stimulus cellular response to stress DNA damage response response to stress nucleobase-containing compound metabolic process DNA replication metabolic process cellular process primary metabolic process DNA metabolic process macromolecule metabolic process nucleic acid metabolic process cellular response to stimulus mismatch repair response to stimulus cellular response to stress DNA damage response response to stress DNA repair DNA-templated DNA replication DNA recombination recombinational repair SOS response	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol protein-containing complex nucleoid single-stranded DNA-binding protein complex protein-DNA complex intracellular membraneless organelle chromosome intracellular organelle organelle membraneless organelle replication fork cellular anatomical structure intracellular anatomical structure cytoplasm cytosol protein-containing complex nucleoid single-stranded DNA-binding protein complex protein-DNA complex intracellular membraneless organelle chromosome intracellular organelle organelle membraneless organelle replication fork replisome

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR007459	DNA polymerase III chi subunit, HolC	Family
A	IPR036768	DNA polymerase III subunit chi superfamily	Homologous Superfamily
B	IPR018382	DNA polymerase III, psi subunit, subgroup	Family
B	IPR036654	DNA polymerase III, psi subunit superfamily	Homologous Superfamily
B	IPR004615	DNA polymerase III, psi subunit	Family
C	IPR011344	Single-stranded DNA-binding protein	Family
C	IPR000424	Primosome PriB/single-strand DNA-binding	Family
C	IPR012340	Nucleic acid-binding, OB-fold	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.