P-loop containing Nucleoside Triphosphate Hydrolases; Members of the P-loop NTPase domain superfamily are characterized by a conserved nucleotide phosphate-binding motif, also referred to as the Walker A motif (GxxxxGK[S/T], where x is any residue), and the Walker B motif (hhhh[D/E], where h is a hydrophobic residue). The Walker A and B motifs bind the beta-gamma phosphate moiety of the bound nucleotide (typically ATP or GTP) and the Mg2+ cation, respectively. The P-loop NTPases are involved in diverse cellular functions, and they can be divided into two major structural classes: the KG (kinase-GTPase) class which includes Ras-like GTPases and its circularly permutated YlqF-like; and the ASCE (additional strand catalytic E) class which includes ATPase Binding Cassette (ABC), DExD/H-like helicases, 4Fe-4S iron sulfur cluster binding proteins of NifH family, RecA-like F1-ATPases, and ATPases Associated with a wide variety of Activities (AAA). Also included are a diverse set of nucleotide/nucleoside kinase families.

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                  ....*....|....*.
gi 1471143418   1 DFYHEMIESGVINLKD 16
Cdd:cd01133   113 DLYHEMKESGVINLDG 128

F1 ATP synthase beta subunit, central domain; The F-ATPase is found in bacterial plasma membranes, mitochondrial inner membranes and in chloroplast thylakoid membranes. It has also been found in the archaea Methanosarcina barkeri. It uses a proton gradient to drive ATP synthesis and hydrolyzes ATP to build the proton gradient. The mitochondrial extrinsic membrane domain, F1, is composed of alpha, beta, gamma, delta and epsilon subunits with a stoichiometry of 3:3:1:1:1. The beta subunit of ATP synthase is catalytic. Alpha and beta subunits form the globular catalytic moiety, a hexameric ring of alternating alpha and beta subunits. Gamma, delta and epsilon subunits form a stalk, connecting F1 to F0, the integral membrane proton-translocating domain.

                          10
                  ....*....|....*.
gi 1471143418   1 DFYHEMIESGVINLKD 16
Cdd:cd01133   113 DLYHEMKESGVINLDG 128

F1 ATP synthase beta subunit, central domain; The F-ATPase is found in bacterial plasma membranes, mitochondrial inner membranes and in chloroplast thylakoid membranes. It has also been found in the archaea Methanosarcina barkeri. It uses a proton gradient to drive ATP synthesis and hydrolyzes ATP to build the proton gradient. The mitochondrial extrinsic membrane domain, F1, is composed of alpha, beta, gamma, delta and epsilon subunits with a stoichiometry of 3:3:1:1:1. The beta subunit of ATP synthase is catalytic. Alpha and beta subunits form the globular catalytic moiety, a hexameric ring of alternating alpha and beta subunits. Gamma, delta and epsilon subunits form a stalk, connecting F1 to F0, the integral membrane proton-translocating domain.

                          10
                  ....*....|....*.
gi 1471143418   1 DFYHEMIESGVINLKD 16
Cdd:cd01133   113 DLYHEMKESGVINLDG 128