Annotations: 1SUM

Crystal structure of a hypothetical protein at 2.0 A resolution

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-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A [auth B]	d1sumb_	All alpha proteins	Spectrin repeat-like	PhoU-like	PhoU-like	PhoU homolog TM1734	(Thermotoga maritima ) [TaxId: 2336 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A [auth B]	SCOP2 Family	biPhoU-like	8027324	4000227	SCOP2 (2022-06-29)
A [auth B]	SCOP2 Superfamily	PhoU-like	8039703	3000081	SCOP2 (2022-06-29)
A [auth B]	SCOP2 Superfamily	PhoU-like	8044577	3000081	SCOP2 (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 [auth B]	VCPO_2nd	e1sumB2	A: a/b three-layered sandwiches	X: all-alpha NTP pyrophosphatases	H: all-alpha NTP pyrophosphatases	T: MazG-related	F: VCPO_2nd	ECOD (v294.1)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth B]	1.20.58.220	Mainly Alpha	Up-down Bundle	Methane Monooxygenase Hydroxylase	Chain G, domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth B]	PF01895	PhoU domain (PhoU)	PhoU domain	This family contains phosphate regulatory proteins including PhoU. PhoU proteins are known to play a role in the regulation of phosphate uptake. The PhoU domain is composed of a three helix bundle [1]. The PhoU protein contains two copies of this dom ...	This family contains phosphate regulatory proteins including PhoU. PhoU proteins are known to play a role in the regulation of phosphate uptake. The PhoU domain is composed of a three helix bundle [1]. The PhoU protein contains two copies of this domain. The domain binds to an iron cluster via its conserved E/DXXXD motif.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B]	Phosphate transport system protein phoU homolog 2	identical protein binding protein binding binding protein homodimerization activity protein dimerization activity	phosphate ion homeostasis intracellular phosphate ion homeostasis cellular homeostasis inorganic ion homeostasis chemical homeostasis homeostatic process intracellular chemical homeostasis localization transport phosphate ion transport establishment of localization inorganic anion transport regulation of biological process regulation of cellular process phosphate ion homeostasis intracellular phosphate ion homeostasis cellular homeostasis inorganic ion homeostasis chemical homeostasis homeostatic process intracellular chemical homeostasis localization transport phosphate ion transport establishment of localization inorganic anion transport regulation of biological process regulation of cellular process negative regulation of metabolic process biological regulation negative regulation of biological process negative regulation of phosphate metabolic process negative regulation of phosphorus metabolic process negative regulation of cellular process phosphate-containing compound metabolic process metabolic process cellular process regulation of phosphorus metabolic process phosphorus metabolic process regulation of metabolic process regulation of phosphate transmembrane transport regulation of localization regulation of transport phosphate ion transmembrane transport negative regulation of phosphate transmembrane transport negative regulation of transport regulation of phosphate transport negative regulation of transmembrane transport transmembrane transport regulation of transmembrane transport	cellular anatomical structure intracellular anatomical structure cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth B]	IPR038078	PhoU-like domain superfamily	Homologous Superfamily
A [auth B]	IPR026022	PhoU domain	Domain
A [auth B]	IPR028366	PhoU	Family

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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.