SUPERFAMILY 1.75 HMM library and genome assignments server

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Inorganic pyrophosphatase superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   All beta proteins [ 48724] (174)
Fold:   OB-fold [ 50198] (16)
Superfamily:   Inorganic pyrophosphatase [ 50324]
Families:   Inorganic pyrophosphatase [ 50325]

Superfamily statistics
Genomes (2,451) Uniprot 2017_06 genome PDB chains (SCOP 1.75)
Domains 3,678 14,820 18
Proteins 3,657 14,788 18

Functional annotation
General category Metabolism
Detailed category Other enzymes

Function annotation of SCOP domain superfamilies

Gene Ontology (high-quality)

(show details)
GO termFDR (singleton)FDR (all)SDFO levelAnnotation (direct or inherited)
Molecular Function (MF)hydrolase activity0.00000000062150Least InformativeDirect
Molecular Function (MF)hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides00Moderately InformativeDirect
Molecular Function (MF)inorganic diphosphatase activity00Highly InformativeDirect

Document: GO annotation of SCOP domains

Gene Ontology (high-coverage)

(show details)
GO term FDR (all) SDFO level Annotation (direct or inherited)
Molecular Function (MF) hydrolase activity 0 Least Informative Direct
Molecular Function (MF) binding 1 Least Informative Inherited
Molecular Function (MF) hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides 0 Moderately Informative Direct
Molecular Function (MF) metal ion binding 0.0003995 Moderately Informative Direct
Molecular Function (MF) inorganic diphosphatase activity 0 Highly Informative Direct
Cellular Component (CC) cytoplasmic part 0.0002362 Least Informative Direct

Document: GO annotation of SCOP domains

Enzyme Commission (EC)

(show details)
EC termFDR (all)SDEO levelAnnotation (direct or inherited)
Enzyme Commission (EC)Acting on acid anhydrides0Least InformativeDirect
Enzyme Commission (EC)In phosphorous-containing anhydrides0Moderately InformativeDirect
Enzyme Commission (EC)Inorganic diphosphatase0Highly InformativeDirect

Document: EC annotation of SCOP domains

UniProtKB KeyWords (KW)

(show details)
KW termFDR (all)SDKW levelAnnotation (direct or inherited)
Cellular componentCytoplasm0Least InformativeDirect
Molecular functionMetal-binding0Least InformativeDirect
Molecular functionMagnesium0Least InformativeDirect
Post-translational modificationHydrolase0Least InformativeDirect

Document: KW annotation of SCOP domains

InterPro annotation
Cross references IPR008162 SSF50324 Protein matches

Inorganic pyrophosphatase (PPase) [PubMed2160278, PubMed1323891] is the enzyme responsible for the hydrolysis of pyrophosphate (PPi) which is formed principally as the product of the many biosynthetic reactions that utilise ATP. All known PPases require the presence of divalent metal cations, with magnesium conferring the highest activity. Among other residues, a lysine has been postulated to be part of or close to the active site. PPases have been sequenced from bacteria such as Escherichia coli (homohexamer), Bacillus PS3 (Thermophilic bacterium PS-3) and Thermus thermophilus, from the archaebacteria Thermoplasma acidophilum, from fungi (homodimer), from a plant, and from bovine retina. In yeast, a mitochondrial isoform of PPase has been characterised which seems to be involved in energy production and whose activity is stimulated by uncouplers of ATP synthesis.

The sequences of PPases share some regions of similarities, among which is a region that contains three conserved aspartates that are involved in the binding of cations.

InterPro database

PDBeMotif information about ligands, sequence and structure motifs
Cross references PDB entries
Ligand binding statistics
Nucleic-acid binding statistics
Occurrence of secondary structure elements
Occurrence of small 3D structural motifs

PDBeMotif resource

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Gene Ontology (high-quality) · Gene Ontology (high-coverage) · Enzyme Commission (EC) · UniProtKB KeyWords (KW) ]

Internal database links

Browse genome assignments for this superfamily. The SUPERFAMILY hidden Markov model library has been used to carry out SCOP domain assignments to all genomes at the superfamily level.

Alignments of sequences to 6 models in this superfamily are available by clicking on the 'Alignments' icon above. PDB sequences less than 40% identical are shown by default, but any other sequence(s) may be aligned. Select PDB sequences, genome sequences, or paste in or upload your own sequences.

Browse and view proteins in genomes which have different domain combinations including a Inorganic pyrophosphatase domain.

Examine the distribution of domain superfamilies, or families, across the major taxonomic kingdoms or genomes within a kingdom. This gives an immediate impression of how superfamilies, or families, are restricted to certain kingdoms of life.

Explore domain occurrence network where nodes represent genomes and edges are domain architectures (shared between genomes) containing the superfamily of interest.

There are 6 hidden Markov models representing the Inorganic pyrophosphatase superfamily. Information on how the models are built, and plots showing hydrophobicity, match emmission probabilities and insertion/deletion probabilities can be inspected.

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Gene Ontology (high-quality) · Gene Ontology (high-coverage) · Enzyme Commission (EC) · UniProtKB KeyWords (KW) · Internal database links ]