publication . Article . 2019

Tracing the Pathways of Waters and Protons in Photosystem II and Cytochrome c Oxidase

Divya Kaur; Xiuhong Cai; Umesh Khaniya; Yingying Zhang; Junjun Mao; Manoj Mandal; Marilyn Gunner;
Open Access English
  • Published: 31 Jan 2019 Journal: Inorganics (issn: 2304-6740, Copyright policy)
  • Publisher: MDPI AG
Abstract
Photosystem II (PSII) uses water as the terminal electron donor, producing oxygen in the Mn<sub>4</sub>CaO<sub>5</sub> oxygen evolving complex (OEC), while cytochrome c oxidase (CcO) reduces O<sub>2</sub> to water in its heme&#8315;Cu binuclear center (BNC). Each protein is oriented in the membrane to add to the proton gradient. The OEC, which releases protons, is located near the P-side (positive, at low-pH) of the membrane. In contrast, the BNC is in the middle of CcO, so the protons needed for O<sub>2</sub> reduction must be transferred from the N-side (negative, at high pH). In addition, CcO pumps protons from N- to P-side, coupled to the O<sub>2</sub> reduc...
Subjects
Medical Subject Headings: macromolecular substances
free text keywords: proton pumping, network analysis, proton affinity, proton coupled electron transfer, Inorganic chemistry, QD146-197, Redox, Proton, Cytochrome c oxidase, biology.protein, biology, Photochemistry, Photosystem II, Electrochemical gradient, Chemistry, Proton-coupled electron transfer, Oxygen-evolving complex
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Article . 2019
Inorganics
Article . 2019
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