4L76

Ca2+-bound E212Q mutant MthK RCK domain

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
Membrane Protein Annotation: mpstruc

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d4l76a1	Alpha and beta proteins (a/b)	NAD(P)-binding Rossmann-fold domains	NAD(P)-binding Rossmann-fold domains	Potassium channel NAD-binding domain	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
A	d4l76a2	Alpha and beta proteins (a+b)	TrkA C-terminal domain-like	TrkA C-terminal domain-like	automated matches	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
A	d4l76a3	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
D	d4l76d1	Alpha and beta proteins (a/b)	NAD(P)-binding Rossmann-fold domains	NAD(P)-binding Rossmann-fold domains	Potassium channel NAD-binding domain	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
D	d4l76d2	Alpha and beta proteins (a+b)	TrkA C-terminal domain-like	TrkA C-terminal domain-like	automated matches	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
D	d4l76d3	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
E	d4l76e1	Alpha and beta proteins (a/b)	NAD(P)-binding Rossmann-fold domains	NAD(P)-binding Rossmann-fold domains	Potassium channel NAD-binding domain	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
E	d4l76e2	Alpha and beta proteins (a+b)	TrkA C-terminal domain-like	TrkA C-terminal domain-like	automated matches	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
E	d4l76e3	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
B	d4l76b1	Alpha and beta proteins (a/b)	NAD(P)-binding Rossmann-fold domains	NAD(P)-binding Rossmann-fold domains	Potassium channel NAD-binding domain	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
B	d4l76b2	Alpha and beta proteins (a+b)	TrkA C-terminal domain-like	TrkA C-terminal domain-like	automated matches	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
B	d4l76b3	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
C	d4l76c1	Alpha and beta proteins (a/b)	NAD(P)-binding Rossmann-fold domains	NAD(P)-binding Rossmann-fold domains	Potassium channel NAD-binding domain	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
C	d4l76c2	Alpha and beta proteins (a+b)	TrkA C-terminal domain-like	TrkA C-terminal domain-like	automated matches	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
F	d4l76f1	Alpha and beta proteins (a/b)	NAD(P)-binding Rossmann-fold domains	NAD(P)-binding Rossmann-fold domains	Potassium channel NAD-binding domain	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
F	d4l76f2	Alpha and beta proteins (a+b)	TrkA C-terminal domain-like	TrkA C-terminal domain-like	automated matches	automated matches	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)
F	d4l76f3	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Methanothermobacter thermautotrophicus str. Delta H ) [TaxId: 187420 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	TrkA C-terminal domain-like	8057608	3000037	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Potassium channel/Rex NAD-binding domain-like	8057606	3000042	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Potassium channel/Rex NAD-binding domain-like	8057606	3000042	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	TrkA C-terminal domain-like	8057608	3000037	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Potassium channel/Rex NAD-binding domain-like	8057606	3000042	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	TrkA C-terminal domain-like	8057608	3000037	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	TrkA C-terminal domain-like	8057608	3000037	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Potassium channel/Rex NAD-binding domain-like	8057606	3000042	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Potassium channel/Rex NAD-binding domain-like	8057606	3000042	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	TrkA C-terminal domain-like	8057608	3000037	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	TrkA C-terminal domain-like	8057608	3000037	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Potassium channel/Rex NAD-binding domain-like	8057606	3000042	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	PF02080	e4l76A1	A: a+b two layers	X: TrkA C-terminal domain-like (From Topology)	H: TrkA C-terminal domain-like (From Topology)	T: TrkA C-terminal domain-like	F: PF02080	ECOD (1.6)
A	PF02254	e4l76A2	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: NAD(P)-binding Rossmann-fold domains	F: PF02254	ECOD (1.6)
D	PF02080	e4l76D4	A: a+b two layers	X: TrkA C-terminal domain-like (From Topology)	H: TrkA C-terminal domain-like (From Topology)	T: TrkA C-terminal domain-like	F: PF02080	ECOD (1.6)
D	PF02254	e4l76D3	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: NAD(P)-binding Rossmann-fold domains	F: PF02254	ECOD (1.6)
E	PF02080	e4l76E1	A: a+b two layers	X: TrkA C-terminal domain-like (From Topology)	H: TrkA C-terminal domain-like (From Topology)	T: TrkA C-terminal domain-like	F: PF02080	ECOD (1.6)
E	PF02254	e4l76E2	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: NAD(P)-binding Rossmann-fold domains	F: PF02254	ECOD (1.6)
B	PF02080	e4l76B1	A: a+b two layers	X: TrkA C-terminal domain-like (From Topology)	H: TrkA C-terminal domain-like (From Topology)	T: TrkA C-terminal domain-like	F: PF02080	ECOD (1.6)
B	PF02254	e4l76B2	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: NAD(P)-binding Rossmann-fold domains	F: PF02254	ECOD (1.6)
C	PF02080	e4l76C4	A: a+b two layers	X: TrkA C-terminal domain-like (From Topology)	H: TrkA C-terminal domain-like (From Topology)	T: TrkA C-terminal domain-like	F: PF02080	ECOD (1.6)
C	PF02254	e4l76C3	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: NAD(P)-binding Rossmann-fold domains	F: PF02254	ECOD (1.6)
F	PF02080	e4l76F4	A: a+b two layers	X: TrkA C-terminal domain-like (From Topology)	H: TrkA C-terminal domain-like (From Topology)	T: TrkA C-terminal domain-like	F: PF02080	ECOD (1.6)
F	PF02254	e4l76F3	A: a/b three-layered sandwiches	X: Rossmann-like	H: Rossmann-related	T: NAD(P)-binding Rossmann-fold domains	F: PF02254	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.720	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NAD(P)-binding Rossmann-like Domain	CATH (4.3.0)
A	1.20.5.870	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Voltage-gated potassium channel	CATH (4.3.0)
A	3.30.70.1450	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Regulator of K+ conductance, C-terminal domain	CATH (4.3.0)
D	3.40.50.720	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NAD(P)-binding Rossmann-like Domain	CATH (4.3.0)
D	1.20.5.870	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Voltage-gated potassium channel	CATH (4.3.0)
D	3.30.70.1450	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Regulator of K+ conductance, C-terminal domain	CATH (4.3.0)
E	3.40.50.720	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NAD(P)-binding Rossmann-like Domain	CATH (4.3.0)
E	1.20.5.870	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Voltage-gated potassium channel	CATH (4.3.0)
E	3.30.70.1450	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Regulator of K+ conductance, C-terminal domain	CATH (4.3.0)
B	3.40.50.720	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NAD(P)-binding Rossmann-like Domain	CATH (4.3.0)
B	1.20.5.870	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Voltage-gated potassium channel	CATH (4.3.0)
B	3.30.70.1450	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Regulator of K+ conductance, C-terminal domain	CATH (4.3.0)
C	3.40.50.720	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NAD(P)-binding Rossmann-like Domain	CATH (4.3.0)
C	1.20.5.870	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Voltage-gated potassium channel	CATH (4.3.0)
C	3.30.70.1450	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Regulator of K+ conductance, C-terminal domain	CATH (4.3.0)
F	3.40.50.720	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NAD(P)-binding Rossmann-like Domain	CATH (4.3.0)
F	1.20.5.870	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Voltage-gated potassium channel	CATH (4.3.0)
F	3.30.70.1450	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Regulator of K+ conductance, C-terminal domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F	PF02080	TrkA-C domain (TrkA_C)	TrkA-C domain	This domain is often found next to the Pfam:PF02254 domain. The exact function of this domain is unknown. It has been suggested that it may bind an unidentified ligand [1]. The domain is predicted to adopt an all beta structure [1].	Domain
A, B, C, D, E A, B, C, D, E, F	PF02254	TrkA-N domain (TrkA_N)	TrkA-N domain	This domain is found in a wide variety of proteins. These protein include potassium channels Swiss:P31069, phosphoesterases Swiss:Q59027, and various other transporters. This domain binds to NAD.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F	Calcium-gated potassium channel MthK	monoatomic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity cation binding ion binding binding metal ion binding small molecule binding identical protein binding protein binding	localization transport monoatomic ion transport potassium ion transport monoatomic cation transport establishment of localization metal ion transport	cell periphery plasma membrane membrane cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F	IPR006037	Regulator of K+ conductance, C-terminal	Domain
A, B, C, D, E A, B, C, D, E, F	IPR013099	Potassium channel domain	Domain
A, B, C, D, E A, B, C, D, E, F	IPR036291	NAD(P)-binding domain superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR036721	Regulator of K+ conductance, C-terminal domain superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F	IPR003148	Regulator of K+ conductance, N-terminal	Domain

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D, E A, B, C, D, E, F	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Potassium, Sodium, & Proton Ion-Selective	MthK Potassium channel gating ring with bound Ca²⁺

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 R01GM133198.