Reference: Rubinstein JL, et al. (2005) ATP synthase from Saccharomyces cerevisiae: location of subunit h in the peripheral stalk region. J Mol Biol 345(3):513-20

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Abstract


Subunit h is a component of the peripheral stalk region of ATP synthase from Saccharomyces cerevisiae. It is weakly homologous to subunit F6 in the bovine enzyme, and F6 can replace the function of subunit h in a yeast strain from which the gene for subunit h has been deleted. The removal of subunit h (or F6) uncouples ATP synthesis from the proton motive force. A biotinylation signal has been introduced following the C terminus of subunit h. It becomes biotinylated in vivo, and allows avidin to be bound quantitatively to the purified enzyme complex in vitro. By electron microscopy of the ATP synthase-avidin complex in negative stain and by subsequent image analysis, the C terminus of subunit h has been located in a region of the peripheral stalk that is close to the Fo membrane domain of ATP synthase. Models of the peripheral stalk are proposed that are consistent with this location and with reconstitution experiments conducted with isolated peripheral stalk subunits.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Rubinstein JL, Dickson VK, Runswick MJ, Walker JE
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