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1: Science. 2005 Apr 29;308(5722):654-9. Epub 2005 Mar 31.
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Structure of the rotor of the V-Type Na+-ATPase from Enterococcus hirae.

Murata T, Yamato I, Kakinuma Y, Leslie AG, Walker JE.

Medical Research Council Dunn Human Nutrition Unit, Hills Road, Cambridge CB2 2XY, UK.

The membrane rotor ring from the vacuolar-type (V-type) sodium ion-pumping adenosine triphosphatase (Na+-ATPase) from Enterococcus hirae consists of 10 NtpK subunits, which are homologs of the 16-kilodalton and 8-kilodalton proteolipids found in other V-ATPases and in F1Fo- or F-ATPases, respectively. Each NtpK subunit has four transmembrane alpha helices, with a sodium ion bound between helices 2 and 4 at a site buried deeply in the membrane that includes the essential residue glutamate-139. This site is probably connected to the membrane surface by two half-channels in subunit NtpI, against which the ring rotates. Symmetry mismatch between the rotor and catalytic domains appears to be an intrinsic feature of both V- and F-ATPases.

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PMID: 15802565 [PubMed - indexed for MEDLINE]