Vacuolar H+-ATPase (V-ATPase) is a ubiquitous multi-subunit proton pump that acidifies a wide variety of intracellular compartments, which in turn affects many biological processes, including membrane trafficking, protein degradation and coupled tran ...
Vacuolar H+-ATPase (V-ATPase) is a ubiquitous multi-subunit proton pump that acidifies a wide variety of intracellular compartments, which in turn affects many biological processes, including membrane trafficking, protein degradation and coupled transport of small molecules and pH homeostasis. Subunit 'a' of V0 (the functional domain responsible for proton transport) sector is highly conserved across eukaryotic species and exists in multiple isoforms. It is the largest subunit of V-ATPases and partitioned almost equally into an N-terminal cytosolic domain and a C-terminal integral membrane. Structure analysis of the N-terminal cytosolic domain from the Meiothermus ruber subunit 'I' homolog of subunit a shows that it is composed of a curved long central alpha-helix bundle capped on both ends by two lobes with similar alpha/beta architecture [1].
Vacuolar ATPase Subunit I N-terminal proximal lobe
This domain is found in the cytoplasmic N-terminal domain of vacuolar ATP synthase subunit I present in Meiothermus ruber. Subunit I is a homolog of subunit A which associates with the membrane-bound complex of eukaryotic vacuolar H+-ATPase (V-ATPase ...
This domain is found in the cytoplasmic N-terminal domain of vacuolar ATP synthase subunit I present in Meiothermus ruber. Subunit I is a homolog of subunit A which associates with the membrane-bound complex of eukaryotic vacuolar H+-ATPase (V-ATPase) acidification machinery. The domain forms the proximal lobe that caps one end of the alpha helix bundle, with the distal lobe capping the other end. Although the two lobes exhibit a similar motif, the molecular nature of the coupling with the identical stalks is thought to be dissimilar [1].
