Kompleks piruvat dehidrogenase

Kompleks piruvat dehidrogenase (bahasa Inggris: pyruvate dehydrogenase complex, PDC) adalah sekelompok enzim dehidrogenase dengan massa sekitar 5.000 hingga 10.000 kDa,[1] yang mengkonversi asam piruvat menjadi asetil-KoA melalui reaksi organik yang disebut dekarboksilasi oksidatif piruvat. Reaksi yang terjadi adalah di dalam mitokondria adalah,[2]

CH3-CO-COOH + CoASH + NAD+CH3-CO-S-CoA + CO2 + NADH + H+

Pada mamalia, PDC terdiri dari sekitar 60 monomer dihidrolipoamida asetiltransferase, 30 monomer piruvat dekarboksilase dan 6 monomer dihidrolipoamida dehidrogenase.[3] Aktivitas PDC dikendalikan oleh PDK sebagai penghambat reaksi fosforilasi PDC, yang diperkirakan sebagai salah satu pencetus defisiensi metabolisme karbohidrat yang sering terjadi pada diabetes mellitus kronik.

Pranala luar

Rujukan

  1. ^ (Inggris) "Atomic structure of the cubic core of the pyruvate dehydrogenase multienzyme complex". Department of Chemistry, University of Groningen; A Mattevi, G Obmolova, E Schulze, KH Kalk, AH Westphal, A de Kok, dan WG Hol. Diakses tanggal 2010-11-03. 
  2. ^ (Inggris) "Structural insight into interactions between dihydrolipoamide dehydrogenase (E3) and E3-binding protein of human pyruvate dehydrogenase complex". Department of Biochemistry, Department of Internal Medicine, The University of Texas Southwestern Medical Center at Dallas; Chad A. Brautigam, R. Max Wynn, Jacinta L. Chuang, Mischa Machius, Diana R. Tomchick, dan David T. Chuang. Diakses tanggal 2010-11-03. 
  3. ^ (Inggris) "A New Level of Architectural Complexity in the Human Pyruvate Dehydrogenase". Division of Biochemistry & Molecular Biology, Institute of Biomedical & Life Sciences, Department of Chemistry, University of Glasgow; Michaela Smolle, Alison Elizabeth Prior, Audrey Elaine Brown, Alan Cooper, Olwyn Byron dan John Gordon Lindsay. Diakses tanggal 2010-11-03. 


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