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Expression, purification, and characterization of subunit E, an essential subunit of the vacuolar ATPase.
Biochem. Biophys. Res. Commun. 298, 383-391 (2002)
A recombinant form of subunit E (Vma4p) from yeast vacuolar ATPases (V-ATPases) has been overexpressed in Escherichia coli, purified to homogeneity, and explored by mass spectrometry. Analysis of the secondary structure of Vma4p by circular dichroism spectroscopy indicated 32% alpha-helix and 23% beta-sheet content. Vma4p formed a hybrid-complex with the nucleotide-binding subunits alpha and beta of the closely related F(1) ATPase of the thermophilic bacterium PS3 (TF(1)). The alpha(3)beta(3)E-hybrid-complex had 56% of the ATPase activity of the native TF(1). By comparison, an alpha(3)beta(3)-formation without Vma4p showed about 24% of total TF(1) ATPase activity. This is the first demonstration of a hydrolytically active hybrid-complex consisting of F(1) and V(1) subunits. The arrangement of subunit E in V(1) has been probed using the recombinant Vma4p, the alpha(3)beta(3)E-hybrid-complex together with V(1) and an A(3)B(3)HEG-subcomplex of the V(1) ATPase from Manduca sexta, respectively, indicating that subunit E is shielded in V(1).
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Sprache
englisch
Veröffentlichungsjahr
2002
HGF-Berichtsjahr
0
ISSN (print) / ISBN
0006-291X
e-ISSN
1090-2104
Quellenangaben
Band: 298,
Heft: 3,
Seiten: 383-391
Verlag
Elsevier
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Pancreatic Islet Research (IPI)
PubMed ID
12413952
Erfassungsdatum
2002-12-31