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Cell. Infect. Microbiol."],"abstract":"<jats:p>Recently, ATP synthase inhibitor Bedaquiline was approved for the treatment of multi-drug resistant tuberculosis emphasizing the importance of oxidative phosphorylation for the survival of mycobacteria. ATP synthesis is primarily dependent on the generation of proton motive force through the electron transport chain in mycobacteria. The mycobacterial electron transport chain utilizes two terminal oxidases for the reduction of oxygen, namely the<jats:italic>bc<jats:sub>1<\/jats:sub>-aa<jats:sub>3<\/jats:sub><\/jats:italic>supercomplex and the cytochrome<jats:italic>bd<\/jats:italic>oxidase. The<jats:italic>bc<jats:sub>1<\/jats:sub>-aa<jats:sub>3<\/jats:sub><\/jats:italic>supercomplex is an energy-efficient terminal oxidase that pumps out four vectoral protons, besides consuming four scalar protons during the transfer of electrons from menaquinone to molecular oxygen. In the past few years, several inhibitors of<jats:italic>bc<jats:sub>1<\/jats:sub>-aa<jats:sub>3<\/jats:sub><\/jats:italic>supercomplex have been developed, out of which, Q203 belonging to the class of imidazopyridine, has moved to clinical trials. Recently, the crystal structure of the mycobacterial cytochrome<jats:italic>bc<jats:sub>1<\/jats:sub>-aa<jats:sub>3<\/jats:sub><\/jats:italic>supercomplex was solved, providing details of the route of transfer of electrons from menaquinone to molecular oxygen. Besides providing insights into the molecular functioning, crystal structure is aiding in the targeted drug development. On the other hand, the second respiratory terminal oxidase of the mycobacterial respiratory chain, cytochrome<jats:italic>bd<\/jats:italic>oxidase, does not pump out the vectoral protons and is energetically less efficient. However, it can detoxify the reactive oxygen species and facilitate mycobacterial survival during a multitude of stresses. Quinolone derivatives (CK-2-63) and quinone derivative (Aurachin D) inhibit cytochrome<jats:italic>bd<\/jats:italic>oxidase. Notably, ablation of both the two terminal oxidases simultaneously through genetic methods or pharmacological inhibition leads to the rapid death of the mycobacterial cells. Thus, terminal oxidases have emerged as important drug targets. In this review, we have described the current understanding of the functioning of these two oxidases, their physiological relevance to mycobacteria, and their inhibitors. Besides these, we also describe the alternative terminal complexes that are used by mycobacteria to maintain energized membrane during hypoxia and anaerobic conditions.<\/jats:p>","DOI":"10.3389\/fcimb.2020.589318","type":"journal-article","created":{"date-parts":[[2020,11,23]],"date-time":"2020-11-23T05:08:50Z","timestamp":1606108130000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":41,"title":["Terminal Respiratory Oxidases: A Targetables Vulnerability of Mycobacterial Bioenergetics?"],"prefix":"10.3389","volume":"10","author":[{"given":"Sapna","family":"Bajeli","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Navin","family":"Baid","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manjot","family":"Kaur","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ganesh P.","family":"Pawar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vinod D.","family":"Chaudhari","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ashwani","family":"Kumar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2020,11,23]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"e52951","DOI":"10.1371\/journal.pone.0052951","article-title":"Identification of novel imidazo[1,2-a]pyridine inhibitors targeting M. tuberculosis QcrB","volume":"7","author":"Abrahams","year":"2012","journal-title":"PLoS One"},{"key":"B2","doi-asserted-by":"publisher","first-page":"27631","DOI":"10.1038\/srep27631","article-title":"Cytochrome bd Displays Significant Quinol Peroxidase Activity","volume":"6","author":"Al-Attar","year":"2016","journal-title":"Sci. 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