6QPQ

The structure of the cohesin head module elucidates the mechanism of ring opening

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 Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d6qpqa1	Alpha and beta proteins (a/b)	P-loop containing nucleoside triphosphate hydrolases	P-loop containing nucleoside triphosphate hydrolases	automated matches	automated matches	(Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ], (Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ],	SCOPe (2.08)
A	d6qpqa2	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ], (Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ],	SCOPe (2.08)
C	d6qpqc1	Alpha and beta proteins (a/b)	P-loop containing nucleoside triphosphate hydrolases	P-loop containing nucleoside triphosphate hydrolases	automated matches	automated matches	(Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ], (Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ],	SCOPe (2.08)
C	d6qpqc2	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ], (Thermochaetoides thermophila DSM 1495 ) [TaxId: 759272 ],	SCOPe (2.08)
B	d6qpqb_	All alpha proteins	DNA/RNA-binding 3-helical bundle	'Winged helix' DNA-binding domain	automated matches	automated matches	(Saccharomyces cerevisiae S288C ) [TaxId: 559292 ],	SCOPe (2.08)
D	d6qpqd_	All alpha proteins	DNA/RNA-binding 3-helical bundle	'Winged helix' DNA-binding domain	automated matches	automated matches	(Saccharomyces cerevisiae S288C ) [TaxId: 559292 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	Winged helix DNA-binding domain	8003274	3000034	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Winged helix DNA-binding domain	8003274	3000034	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	SMC_N	e6qpqA1	A: alpha bundles	X: Helical domain in structural maintenance of chromosomes protein 3 (From Topology)	H: Helical domain in structural maintenance of chromosomes protein 3 (From Topology)	T: Helical domain in structural maintenance of chromosomes protein 3	F: SMC_N	ECOD (1.6)
A	SMC_N	e6qpqA2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: SMC_N	ECOD (1.6)
C	SMC_N	e6qpqC1	A: alpha bundles	X: Helical domain in structural maintenance of chromosomes protein 3 (From Topology)	H: Helical domain in structural maintenance of chromosomes protein 3 (From Topology)	T: Helical domain in structural maintenance of chromosomes protein 3	F: SMC_N	ECOD (1.6)
C	SMC_N	e6qpqC2	A: a/b three-layered sandwiches	X: P-loop domains-like	H: P-loop domains-related	T: P-loop containing nucleoside triphosphate hydrolases	F: SMC_N	ECOD (1.6)
B	Rad21_Rec8	e6qpqB1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Rad21_Rec8	ECOD (1.6)
D	Rad21_Rec8	e6qpqD1	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Rad21_Rec8	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.10.580	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Structural maintenance of chromosome 1. Chain E	CATH (utative)
D	1.10.10.580	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Structural maintenance of chromosome 1. Chain E	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C	PF02463	RecF/RecN/SMC N terminal domain (SMC_N)	RecF/RecN/SMC N terminal domain	This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. T ...	This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics [1]. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.	Domain
B, D	PF04824	Conserved region of Rad21 / Rec8 like protein (Rad21_Rec8)	Conserved region of Rad21 / Rec8 like protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C	Structural maintenance of chromosomes protein,Structural maintenance of chromosomes protein	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding pyrophosphatase activity ATP hydrolysis activity ribonucleoside triphosphate phosphatase activity hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides hydrolase activity hydrolase activity, acting on acid anhydrides catalytic activity ATP-dependent activity	cellular component organization organelle organization chromosome organization sister chromatid cohesion cellular process cellular component organization or biogenesis cell cycle cell cycle process cell division	intracellular organelle protein-containing complex intracellular anatomical structure organelle intracellular non-membrane-bounded organelle chromosome cellular anatomical entity non-membrane-bounded organelle cohesin complex membrane-bounded organelle nucleus intracellular membrane-bounded organelle
B, D	Sister chromatid cohesion protein 1	protein binding binding kinase binding enzyme binding protein kinase binding protein-containing complex binding chromatin binding	cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process nucleobase-containing compound metabolic process organic substance metabolic process replication-born double-strand break repair via sister chromatid exchange heterocycle metabolic process nitrogen compound metabolic process recombinational repair double-strand break repair via homologous recombination DNA repair cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process nucleobase-containing compound metabolic process organic substance metabolic process replication-born double-strand break repair via sister chromatid exchange heterocycle metabolic process nitrogen compound metabolic process recombinational repair double-strand break repair via homologous recombination DNA repair double-strand break repair cellular metabolic process DNA recombination cellular nitrogen compound metabolic process primary metabolic process DNA metabolic process nucleic acid metabolic process organic cyclic compound metabolic process metabolic process macromolecule metabolic process cellular aromatic compound metabolic process organonitrogen compound metabolic process protein acylation protein acetylation macromolecule modification protein metabolic process protein modification process cell division cellular component organization organelle organization mitotic sister chromatid cohesion chromosome organization sister chromatid cohesion cellular component organization or biogenesis cell cycle cell cycle process apoptotic process cell death programmed cell death mitotic nuclear division mitotic chromosome condensation organelle fission sister chromatid segregation mitotic cell cycle nuclear division mitotic cell cycle process chromosome condensation mitotic sister chromatid segregation nuclear chromosome segregation chromosome segregation establishment of mitotic sister chromatid cohesion establishment of sister chromatid cohesion	membrane-bounded organelle intracellular organelle intracellular anatomical structure mitochondrion organelle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle condensed nuclear chromosome nucleus membrane-enclosed lumen nuclear chromosome chromosome intracellular organelle lumen membrane-bounded organelle intracellular organelle intracellular anatomical structure mitochondrion organelle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle condensed nuclear chromosome nucleus membrane-enclosed lumen nuclear chromosome chromosome intracellular organelle lumen organelle lumen intracellular non-membrane-bounded organelle condensed chromosome non-membrane-bounded organelle nuclear lumen chromosome, centromeric region chromosomal region protein-containing complex cohesin complex mitotic cohesin complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C	IPR028468	Smc1, ATP-binding cassette domain	Domain
A, C	IPR010935	SMCs flexible hinge	Domain
A, C	IPR036277	SMCs flexible hinge superfamily	Homologous Superfamily
A, C	IPR003395	RecF/RecN/SMC, N-terminal	Domain
A, C	IPR024704	Structural maintenance of chromosomes protein	Family
A, C	IPR027417	P-loop containing nucleoside triphosphate hydrolase	Homologous Superfamily
B, D	IPR039781	Rad21/Rec8-like protein	Family
B, D	IPR006910	Rad21/Rec8-like protein, N-terminal	Domain
B, D	IPR036390	Winged helix DNA-binding domain superfamily	Homologous Superfamily
B, D	IPR023093	ScpA-like, C-terminal	Homologous Superfamily
B, D	IPR006909	Rad21/Rec8-like protein, C-terminal, eukaryotic	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.