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Tytuł pozycji:

Activation of Cytochrome C Peroxidase Function Through Coordinated Foldon Loop Dynamics upon Interaction with Anionic Lipids.

Tytuł:
Activation of Cytochrome C Peroxidase Function Through Coordinated Foldon Loop Dynamics upon Interaction with Anionic Lipids.
Autorzy:
Li M; Department of Structural Biology, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Sun W; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA; Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Tyurin VA; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA; Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA 15213, USA.
DeLucia M; Department of Structural Biology, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Ahn J; Department of Structural Biology, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Kagan VE; Department of Environmental and Occupational Health, University of Pittsburgh, Pittsburgh, PA 15213, USA; Center for Free Radical and Antioxidant Health, University of Pittsburgh, Pittsburgh, PA 15213, USA; Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15213, USA; Department of Pharmacology and Chemical Biology, University of Pittsburgh, Pittsburgh, PA 15213, USA; Institute for Regenerative Medicine, IM Sechenov, Moscow State Medical University, Moscow 119146, Russian Federation.
van der Wel PCA; Department of Structural Biology, University of Pittsburgh, Pittsburgh, PA 15213, USA; Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands. Electronic address: .
Źródło:
Journal of molecular biology [J Mol Biol] 2021 Jul 23; Vol. 433 (15), pp. 167057. Date of Electronic Publication: 2021 May 24.
Typ publikacji:
Comparative Study; Journal Article; Research Support, N.I.H., Extramural
Język:
English
Imprint Name(s):
Publication: Amsterdam : Elsevier
Original Publication: 1959- : London : Academic Press
MeSH Terms:
Cardiolipins/*metabolism
Cytochrome-c Peroxidase/*chemistry
Cytochrome-c Peroxidase/*metabolism
Phosphatidylglycerols/*metabolism
Cytochromes c/metabolism ; Gene Expression Regulation ; Magnetic Resonance Spectroscopy ; Models, Molecular ; Nuclear Magnetic Resonance, Biomolecular ; Protein Conformation
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Grant Information:
P01 HL114453 United States HL NHLBI NIH HHS; R01 GM113908 United States GM NIGMS NIH HHS; S10 OD012213 United States OD NIH HHS; U19 AI068021 United States AI NIAID NIH HHS
Contributed Indexing:
Keywords: lipid peroxidation; lipidomics; mitochondrial apoptosis; peripheral membrane proteins; solid-state NMR spectroscopy
Substance Nomenclature:
0 (Cardiolipins)
0 (Phosphatidylglycerols)
9007-43-6 (Cytochromes c)
EC 1.11.1.5 (Cytochrome-c Peroxidase)
Entry Date(s):
Date Created: 20210525 Date Completed: 20210920 Latest Revision: 20220724
Update Code:
20240105
PubMed Central ID:
PMC8380053
DOI:
10.1016/j.jmb.2021.167057
PMID:
34033821
Czasopismo naukowe
Cardiolipin (CL) is a mitochondrial anionic lipid that plays important roles in the regulation and signaling of mitochondrial apoptosis. CL peroxidation catalyzed by the assembly of CL-cytochrome c (cyt c) complexes at the inner mitochondrial membrane is a critical checkpoint. The structural changes in the protein, associated with peroxidase activation by CL and different anionic lipids, are not known at a molecular level. To better understand these peripheral protein-lipid interactions, we compare how phosphatidylglycerol (PG) and CL lipids trigger cyt c peroxidase activation, and correlate functional differences to structural and motional changes in membrane-associated cyt c. Structural and motional studies of the bound protein are enabled by magic angle spinning solid state NMR spectroscopy, while lipid peroxidase activity is assayed by mass spectrometry. PG binding results in a surface-bound state that preserves a nativelike fold, which nonetheless allows for significant peroxidase activity, though at a lower level than binding its native substrate CL. Lipid-specific differences in peroxidase activation are found to correlate to corresponding differences in lipid-induced protein mobility, affecting specific protein segments. The dynamics of omega loops C and D are upregulated by CL binding, in a way that is remarkably controlled by the protein:lipid stoichiometry. In contrast to complete chemical denaturation, membrane-induced protein destabilization reflects a destabilization of select cyt c foldons, while the energetically most stable helices are preserved. Our studies illuminate the interplay of protein and lipid dynamics in the creation of lipid peroxidase-active proteolipid complexes implicated in early stages of mitochondrial apoptosis.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 The Author(s). Published by Elsevier Ltd.. All rights reserved.)

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