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  Topic: ATPase origins, Stuff pertinent to this question< Next Oldest | Next Newest >  

Posts: 319
Joined: May 2002

(Permalink) Posted: Mar. 15 2003,04:56   

Free online article comparing PPases and F1F0-ATPases:


FEBS Lett 1999 Sep 3;457(3):527-33
H(+)-PPases: a tightly membrane-bound family

Baltscheffsky M, Schultz A, Baltscheffsky H.

Department of Biochemistry, Arrhenius Laboratories, Stockholm University, S-106 91, Stockholm, Sweden.

The earliest known H(+)-PPase (proton-pumping inorganic pyrophosphatase), the integrally membrane-bound H(+)-PPi synthase (proton-pumping inorganic pyrophosphate synthase) from Rhodospirillum rubrum, is still the only alternative to H(+)-ATP synthase in biological electron transport phosphorylation. Cloning of several higher plant vacuolar H(+)-PPase genes has led to the recognition that the corresponding proteins form a family of extremely similar proton-pumping enzymes. The bacterial H(+)-PPi synthase and two algal vacuolar H(+)-PPases are homologous with this family, as deduced from their cloned genes. The prokaryotic and algal homologues differ more than the H(+)-PPases from higher plants, facilitating recognition of functionally significant entities. Primary structures of H(+)-PPases are reviewed and compared with H(+)-ATPases and soluble PPases.

  5 replies since Oct. 01 2002,13:47 < Next Oldest | Next Newest >  


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