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-Structure paper
タイトル | Structure of complex III with bound antimalarial agent CK-2-68 provides insights into selective inhibition of Plasmodium cytochrome bc complexes. |
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ジャーナル・号・ページ | J Biol Chem, Vol. 299, Issue 7, Page 104860, Year 2023 |
掲載日 | 2023年5月24日 |
著者 | Lothar Esser / Fei Zhou / Allison Zeher / Weimin Wu / Rick Huang / Chang-An Yu / Kristin D Lane / Thomas E Wellems / Di Xia / |
PubMed 要旨 | Among the various components of the protozoan Plasmodium mitochondrial respiratory chain, only Complex III is a validated cellular target for antimalarial drugs. The compound CK-2-68 was developed to ...Among the various components of the protozoan Plasmodium mitochondrial respiratory chain, only Complex III is a validated cellular target for antimalarial drugs. The compound CK-2-68 was developed to specifically target the alternate NADH dehydrogenase of the malaria parasite respiratory chain, but the true target for its antimalarial activity has been controversial. Here, we report the cryo-EM structure of mammalian mitochondrial Complex III bound with CK-2-68 and examine the structure-function relationships of the inhibitor's selective action on Plasmodium. We show that CK-2-68 binds specifically to the quinol oxidation site of Complex III, arresting the motion of the iron-sulfur protein subunit, which suggests an inhibition mechanism similar to that of P-type Complex III inhibitors such as atovaquone, stigmatellin, and UHDBT. Our results shed light on the mechanisms of observed resistance conferred by mutations, elucidate the molecular basis of the wide therapeutic window of CK-2-68 for selective action of Plasmodium vs. host cytochrome bc, and provide guidance for future development of antimalarials targeting Complex III. |
リンク | J Biol Chem / PubMed:37236355 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.88 Å |
構造データ | EMDB-26203, PDB-7tz6: |
化合物 | ChemComp-HEM: ChemComp-JHB: ChemComp-HEC: ChemComp-FES: |
由来 |
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キーワード | OXIDOREDUCTASE / Mitochondrial cytochrome bc1 / antimalarial inhibitor / electron transfer |