Summary: V-ATPase subunit H
V-ATPase subunit H Provide feedback
The yeast Saccharomyces cerevisiae vacuolar H+-ATPase (V-ATPase) is a multisubunit complex responsible for acidifying organelles. It functions as an ATP dependent proton pump that transports protons across a lipid bilayer. This domain corresponds to the C terminal domain of the H subunit of V-ATPase. The N-terminal domain is required for the activation of the complex whereas the C-terminal domain is required for coupling ATP hydrolysis to proton translocation .
Flannery AR, Stevens TH; , J Biol Chem. 2008; [Epub ahead of print]: Functional characterization of the N-terminal domain of subunit H (Vma13p) of the yeast vacuolar ATPase. PUBMED:18708638 EPMC:18708638
Liu M, Tarsio M, Charsky CM, Kane PM; , J Biol Chem. 2005;280:36978-36985.: Structural and functional separation of the N- and C-terminal domains of the yeast V-ATPase subunit H. PUBMED:16141210 EPMC:16141210
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This tab holds annotation information from the InterPro database.
InterPro entry IPR011987
Transmembrane ATPases are membrane-bound enzyme complexes/ion transporters that use ATP hydrolysis to drive the transport of protons across a membrane. Some transmembrane ATPases also work in reverse, harnessing the energy from a proton gradient, using the flux of ions across the membrane via the ATPase proton channel to drive the synthesis of ATP.
There are several different types of transmembrane ATPases, which can differ in function (ATP hydrolysis and/or synthesis), structure (e.g., F-, V- and A-ATPases, which contain rotary motors) and in the type of ions they transport [PUBMED:15473999, PUBMED:15078220]. The different types include:
- F-ATPases (F1F0-ATPases), which are found in mitochondria, chloroplasts and bacterial plasma membranes where they are the prime producers of ATP, using the proton gradient generated by oxidative phosphorylation (mitochondria) or photosynthesis (chloroplasts).
- V-ATPases (V1V0-ATPases), which are primarily found in eukaryotic vacuoles and catalyse ATP hydrolysis to transport solutes and lower pH in organelles.
- A-ATPases (A1A0-ATPases), which are found in Archaea and function like F-ATPases (though with respect to their structure and some inhibitor responses, A-ATPases are more closely related to the V-ATPases).
- P-ATPases (E1E2-ATPases), which are found in bacteria and in eukaryotic plasma membranes and organelles, and function to transport a variety of different ions across membranes.
- E-ATPases, which are cell-surface enzymes that hydrolyse a range of NTPs, including extracellular ATP.
V-ATPases (also known as V1V0-ATPase or vacuolar ATPase) (EC) are found in the eukaryotic endomembrane system, and in the plasma membrane of prokaryotes and certain specialised eukaryotic cells. V-ATPases hydrolyse ATP to drive a proton pump, and are involved in a variety of vital intra- and inter-cellular processes such as receptor mediated endocytosis, protein trafficking, active transport of metabolites, homeostasis and neurotransmitter release [PUBMED:15629643]. V-ATPases are composed of two linked complexes: the V1 complex (subunits A-H) contains the catalytic core that hydrolyses ATP, while the V0 complex (subunits a, c, c', c'', d) forms the membrane-spanning pore. V-ATPases may have an additional role in membrane fusion through binding to t-SNARE proteins [PUBMED:15907459].
This entry represents the C-terminal domain of subunit H (also known as Vma13p) found in the V1 complex of V-ATPases. This subunit has a regulatory function, being responsible for activating ATPase activity and coupling ATPase activity to proton flow [PUBMED:14635776]. The yeast enzyme contains five motifs similar to the HEAT or Armadillo repeats seen in the importins, and can be divided into two distinct domains: a large N-terminal domain consisting of stacked alpha helices, and a smaller C-terminal alpha-helical domain with a similar superhelical topology to an armadillo repeat [PUBMED:11416198].
More information about this protein can be found at Protein of the Month: ATP Synthases [PUBMED:].
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||vacuolar proton-transporting V-type ATPase, V1 domain (GO:0000221)|
|Molecular function||hydrolase activity, acting on acid anhydrides, catalyzing transmembrane movement of substances (GO:0016820)|
|Biological process||ATP hydrolysis coupled proton transport (GO:0015991)|
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Tetratricopeptide-like repeats are found in a numerous and diverse proteins involved in such functions as cell cycle regulation, transcriptional control, mitochondrial and peroxisomal protein transport, neurogenesis and protein folding.
The clan contains the following 117 members:Adaptin_N Alkyl_sulf_dimr Apc3 Apc5 API5 Arm Arm_2 Avirulence BTAD CAS_CSE1 ChAPs CLASP_N Clathrin Clathrin-link Clathrin_propel Cnd1 Cnd3 Coatomer_E Cohesin_HEAT Cohesin_load CRM1_C Cse1 DNA_alkylation Drf_FH3 Drf_GBD DUF1822 DUF2225 DUF3385 DUF3458 DUF3808 DUF3856 EST1_DNA_bind FAT Fis1_TPR_C Fis1_TPR_N Foie-gras_1 GUN4 HAT HEAT HEAT_2 HEAT_EZ HEAT_PBS HemY_N IBB IBN_N IFRD KAP Leuk-A4-hydro_C LRV LRV_FeS MA3 MIF4G MIF4G_like MIF4G_like_2 MMS19_C Mo25 MRP-S27 NARP1 Neurochondrin Nro1 NSF Paf67 ParcG PC_rep PHAT PI3Ka PPP5 PPR PPR_1 PPR_2 PPR_3 Proteasom_PSMB PUF Rab5-bind Rapsyn_N RPN7 Sel1 SHNi-TPR SNAP SPO22 ST7 Suf SusD SusD-like SusD-like_2 SusD-like_3 Tcf25 TOM20_plant TPR_1 TPR_10 TPR_11 TPR_12 TPR_14 TPR_15 TPR_16 TPR_17 TPR_18 TPR_19 TPR_2 TPR_20 TPR_21 TPR_3 TPR_4 TPR_5 TPR_6 TPR_7 TPR_8 TPR_9 Upf2 V-ATPase_H_C V-ATPase_H_N Vac14_Fab1_bd Vitellogenin_N Vps39_1 W2 Xpo1 YfiO
We make a range of alignments for each Pfam-A family:
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Curation and family details
|Seed source:||Pfam-B_2481 (release 6.5)|
|Number in seed:||34|
|Number in full:||388|
|Average length of the domain:||116.70 aa|
|Average identity of full alignment:||42 %|
|Average coverage of the sequence by the domain:||25.79 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||3|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the V-ATPase_H_C domain has been found. There are 1 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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