Summary: ATP synthase subunit C
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ATP synthase subunit C Edit Wikipedia article
ATPase, subunit C of F0/V0 complex is the main transmembrane subunit of V-type, A-type and F-type ATP synthases.
ATPases (or ATP synthases) are membrane-bound enzyme complexes/ion transporters that combine ATP synthesis and/or hydrolysis with the transport of protons across a membrane. ATPases can harness 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. Some ATPases work in reverse, using the energy from the hydrolysis of ATP to create a proton gradient. There are different types of ATPases, which can differ in function (ATP synthesis and/or hydrolysis), structure (F-, V- and A-ATPases contain rotary motors) and in the type of ions they transport.
- F-ATPases (F1F0-ATPases) in mitochondria, chloroplasts and bacterial plasma membranes are the prime producers of ATP, using the proton gradient generated by oxidative phosphorylation (mitochondria) or photosynthesis (chloroplasts).
- V-ATPase (V1V0-ATPases) are primarily found in eukaryotic vacuoles, catalysing ATP hydrolysis to transport solutes and lower pH in organelles.
- A-ATPases (A1A0-ATPases) are found in Archaea and function like F-ATPases.
- P-ATPases (E1E2-ATPases) are found in bacteria and in eukaryotic plasma membranes and organelles, and function to transport a variety of different ions across membranes.
- E-ATPases are cell-surface enzymes that hydrolyse a range of NTPs, including extracellular ATP.
The F-ATPases (or F1F0-ATPases) and V-ATPases (or V1V0-ATPases) are each composed of two linked complexes: the F1 or V1 complex contains the catalytic core that synthesizes/hydrolyses ATP, and the F0 or V0 complex that forms the membrane-spanning pore. The F- and V-ATPases all contain rotary motors, one that drives proton translocation across the membrane and one that drives ATP synthesis/hydrolysis.
Subunit C (also called subunit 9, or proteolipid in F-ATPases, or the 16 kDa proteolipid in V-ATPases) was found in the F0 or V0 complex of F- and V-ATPases, respectively. In F-ATPases, ten C subunits form an oligomeric ring that makes up the F0 rotor. The flux of protons through the ATPase channel drives the rotation of the C subunit ring, which in turn is coupled to the rotation of the F1 complex gamma subunit rotor due to the permanent binding between the gamma and epsilon subunits of F1 and the C subunit ring of F0. The sequential protonation and deprotonation of Asp61 of subunit C is coupled to the stepwise movement of the rotor.
In V-ATPases, there are three proteolipid subunits (c, c′ and c′′) that form part of the proton-conducting pore, each containing a buried glutamic acid residue that is essential for proton transport, and together they form a hexameric ring spanning the membrane.
In a recent study c-subunit has been indicated as a critical component of the mitochondrial permeability transition pore.
- ATPase, V0 complex, proteolipid subunit C, InterPro: IPR000245
- ATPase, F0 complex, subunit C InterPro: IPR000454
Human proteins containing this domain
- Muller V, Cross RL (2004). "The evolution of A-, F-, and V-type ATP synthases and ATPases: reversals in function and changes in the H+/ATP coupling ratio". FEBS Lett. 576 (1): 1–4. doi:10.1016/j.febslet.2004.08.065. PMID 15473999.
- Zhang X, Niwa H, Rappas M (2004). "Mechanisms of ATPases--a multi-disciplinary approach". Curr Protein Pept Sci. 5 (2): 89–105. doi:10.2174/1389203043486874. PMID 15078220.
- Itoh H, Yoshida M, Yasuda R, Noji H, Kinosita K (2001). "Resolution of distinct rotational substeps by submillisecond kinetic analysis of F1-ATPase". Nature. 410 (6831): 898–904. doi:10.1038/35073513. PMID 11309608.
- Wilkens S, Zheng Y, Zhang Z (2005). "A structural model of the vacuolar ATPase from transmission electron microscopy". Micron. 36 (2): 109–126. doi:10.1016/j.micron.2004.10.002. PMID 15629643.
- Fillingame RH, Angevine CM, Dmitriev OY (2003). "Mechanics of coupling proton movements to c-ring rotation in ATP synthase". FEBS Lett. 555 (1): 29–34. doi:10.1016/S0014-5793(03)01101-3. PMID 14630314.
- Inoue T, Forgac M (2005). "Cysteine-mediated cross-linking indicates that subunit C of the V-ATPase is in close proximity to subunits E and G of the V1 domain and subunit a of the V0 domain". J. Biol. Chem. 280 (30): 27896–27903. doi:10.1074/jbc.M504890200. PMID 15951435.
- Jones R, Findlay JB, Harrison M, Durose L, Song CF, Barratt E, Trinick J (2003). "Structure and function of the vacuolar H+-ATPase: moving from low-resolution models to high-resolution structures". J. Bioenerg. Biomembr. 35 (4): 337–345. doi:10.1023/A:1025728915565. PMID 14635779.
- Bonora, M; Bononi, A; De Marchi, E; Giorgi, C; Lebiedzinska, M; Marchi, S; Patergnani, S; Rimessi, A; Suski, JM; Wojtala, A; Wieckowski, MR; Kroemer, G; Galluzzi, L; Pinton, P (Feb 15, 2013). "Role of the c subunit of the FO ATP synthase in mitochondrial permeability transition.". Cell cycle (Georgetown, Tex.). 12 (4): 674–83. doi:10.4161/cc.23599. PMC . PMID 23343770.
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ATP synthase subunit C Provide feedback
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External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR002379
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 (ATP synthases, 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 eukaryotes and they function as proton pumps that acidify intracellular compartments and, in some cases, transport protons across the plasma membrane [PUBMED:20450191]. They are also found in bacteria [PUBMED:9741106].
- 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 [PUBMED:18937357, PUBMED:1385979].
- 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.
The F-ATPases (or F1F0-ATPases) and V-ATPases (or V1V0-ATPases) are each composed of two linked complexes: the F1 or V1 complex contains the catalytic core that synthesizes/hydrolyses ATP, and the F0 or V0 complex that forms the membrane-spanning pore. The F- and V-ATPases all contain rotary motors, one that drives proton translocation across the membrane and one that drives ATP synthesis/hydrolysis [PUBMED:11309608, PUBMED:15629643].
In V-ATPases, there are three proteolipid subunits (c, c' and c'') that form part of the proton-conducting pore, each containing a buried glutamic acid residue that is essential for proton transport, and together they form a hexameric ring spanning the membrane [PUBMED:15951435, PUBMED:14635779].
Structurally, the c subunits consist of a two antiparallel transmembrane helices. Both helices of one c subunit are connected by a loop on the cytoplasmic side [PUBMED:19783985].
This entry represents the V-ATPase proteolipid subunit C like domain found in the V-ATPase proteolipid subunit C and the F-ATP synthase subunit C.
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||proton-transporting two-sector ATPase complex, proton-transporting domain (GO:0033177)|
|Molecular function||hydrogen ion transmembrane transporter activity (GO:0015078)|
|Biological process||ATP hydrolysis coupled proton transport (GO:0015991)|
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1Cannot generate PP/Heatmap alignments for seeds; no PP data available
Key: available, not generated, — not available.
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|Number in seed:||1080|
|Number in full:||11707|
|Average length of the domain:||61.30 aa|
|Average identity of full alignment:||29 %|
|Average coverage of the sequence by the domain:||65.18 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 26740544 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||20|
|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 ATP-synt_C domain has been found. There are 676 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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