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EC 7.1.2.2 Details
EC number
7.1.2.2
Accepted name
H+-transporting two-sector ATPase
Reaction
ATP + H2O + 4 H+[side 1] = ADP + phosphate + 4 H+[side 2]
Other name(s)
ATP synthase, F1-ATPase, FoF1-ATPase, H+-transporting ATPase, mitochondrial ATPase, coupling factors (Fo F1 and CF1), chloroplast ATPase, bacterial Ca2+/Mg2+ ATPase
Systematic name
ATP phosphohydrolase (two-sector, H+-transporting)
Comment
A multisubunit non-phosphorylated ATPase that is involved in the transport of ions. Large enzymes of mitochondria, chloroplasts and bacteria with a membrane sector (Fo, Vo, Ao) and a cytoplasmic-compartment sector (F1, V1, A1). The F-type enzymes of the inner mitochondrial and thylakoid membranes act as ATP synthases. All of the enzymes included here operate in a rotational mode, where the extramembrane sector (containing 3 α- and 3 β-subunits) is connected via the δ-subunit to the membrane sector by several smaller subunits. Within this complex, the γ- and ε-subunits, as well as the 9–12 c subunits rotate by consecutive 120° angles and perform parts of ATP synthesis. This movement is driven by the H+ electrochemical potential gradient. The V-type (in vacuoles and clathrin-coated vesicles) and A-type (archaeal) enzymes have a similar structure but, under physiological conditions, they pump H+ rather than synthesize ATP.
History
created 1984 as EC 3.6.1.34, transferred 2000 to EC 3.6.3.14, transferred 2018 to EC 7.1.2.2
EC Tree
1.2.1.1 created 1961, modified 1982, modified 2002, deleted 2005
1.2.1.6 created 1961, deleted 1965
1.2.1.14 created 1961, deleted 1984
1.2.1.34 created 1972, deleted 1983 [transferred to EC 1.1.1.180, deleted 1984]
1.2.1.35 created 1972, deleted 1984
1.2.1.37 created 1972, deleted 1984
1.2.1.55 created 1990, deleted 2003
1.2.1.56 created 1990, deleted 2003