کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2052563 1074233 2005 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure of dimeric ATP synthase from mitochondria: An angular association of monomers induces the strong curvature of the inner membrane
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Structure of dimeric ATP synthase from mitochondria: An angular association of monomers induces the strong curvature of the inner membrane
چکیده انگلیسی

Respiration in all cells depends upon synthesis of ATP by the ATP synthase complex, a rotary motor enzyme. The structure of the catalytic moiety of ATP synthase, the so-called F1 headpiece, is well established. F1 is connected to the membrane-bound and ion translocating F0 subcomplex by a central stalk. A peripheral stalk, or stator, prevents futile rotation of the headpiece during catalysis. Although the enzyme functions as a monomer, several lines of evidence have recently suggested that monomeric ATP synthase complexes might interact to form a dimeric supercomplex in mitochondria. However, due to its fragility, the structure of ATP synthase dimers has so far not been precisely defined for any organism. Here we report the purification of a stable dimeric ATP synthase supercomplex, using mitochondria of the alga Polytomella. Structural analysis by electron microscopy and single particle analysis revealed that dimer formation is based on specific interaction of the F0 parts, not the F1 headpieces which are not at all in close proximity. Remarkably, the angle between the two F0 part is about 70°, which induces a strong local bending of the membrane. Hence, the function of ATP synthase dimerisation is to control the unique architecture of the mitochondrial inner membrane.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 579, Issue 25, 24 October 2005, Pages 5769–5772
نویسندگان
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