The purification and characterization of ATP synthase complexes from the mitochondria of four fungal species.

TitleThe purification and characterization of ATP synthase complexes from the mitochondria of four fungal species.
Publication TypeJournal Article
Year of Publication2015
AuthorsLiu, S, Charlesworth, TJ, Bason, JV, Montgomery, MG, Harbour, ME, Fearnley, IM, Walker, JE
JournalBiochem J
Volume468
Issue1
Pagination167-75
Date Published2015 May 15
ISSN1470-8728
KeywordsAmino Acid Sequence, Animals, Cattle, Chromatography, Affinity, Enzyme Stability, Fungal Proteins, Fungi, Mitochondrial Proton-Translocating ATPases, Molecular Sequence Data, Pichia, Protein Structure, Tertiary, Protein Subunits, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Sequence Homology, Amino Acid, Species Specificity, Yarrowia
Abstract

The ATP synthases have been isolated by affinity chromatography from the mitochondria of the fungal species Yarrowia lipolytica, Pichia pastoris, Pichia angusta and Saccharomyces cerevisiae. The subunit compositions of the purified enzyme complexes depended on the detergent used to solubilize and purify the complex, and the presence or absence of exogenous phospholipids. All four enzymes purified in the presence of n-dodecyl-β-D-maltoside had a complete complement of core subunits involved directly in the synthesis of ATP, but they were deficient to different extents in their supernumerary membrane subunits. In contrast, the enzymes from P. angusta and S. cerevisiae purified in the presence of n-decyl-β-maltose neopentyl glycol and the phospholipids 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine, cardiolipin (diphosphatidylglycerol) and 1-palmitoyl-2-oleoyl-sn-glycero-3-[phospho-rac-(1-glycerol)] had a complete complement of core subunits and also contained all of the known supernumerary membrane subunits, e, f, g, j, k and ATP8 (or Aap1), plus an additional new membrane component named subunit l, related in sequence to subunit k. The catalytic domain of the enzyme from P. angusta was more resistant to thermal denaturation than the enzyme from S. cerevisiae, but less stable than the catalytic domain of the bovine enzyme, but the stator and the integrity of the transmembrane proton pathway were most stable in the enzyme from P. angusta. The P. angusta enzyme provides a suitable source of enzyme for studying the structure of the membrane domain and properties associated with that sector of the enzyme complex.

DOI10.1042/BJ20150197
Alternate JournalBiochem. J.
Citation Key10.1042/BJ20150197
PubMed ID25759169
PubMed Central IDPMC4422255
Grant ListMC_U105663150 / / Medical Research Council / United Kingdom
/ / Medical Research Council / United Kingdom