Selective expression of light-harvesting complexes alters phospholipid composition in the intracytoplasmic membrane and core complex of purple phototrophic bacteria.
Carotenoid
Light-harvesting
Membrane morphology
Reaction center
Rhodobacter sphaeroides
Journal
Biochimica et biophysica acta. Bioenergetics
ISSN: 1879-2650
Titre abrégé: Biochim Biophys Acta Bioenerg
Pays: Netherlands
ID NLM: 101731706
Informations de publication
Date de publication:
01 11 2023
01 11 2023
Historique:
received:
27
04
2023
revised:
23
07
2023
accepted:
26
07
2023
medline:
11
9
2023
pubmed:
2
8
2023
entrez:
1
8
2023
Statut:
ppublish
Résumé
Phospholipid-protein interactions play important roles in regulating the function and morphology of photosynthetic membranes in purple phototrophic bacteria. Here, we characterize the phospholipid composition of intracytoplasmic membrane (ICM) from Rhodobacter (Rba.) sphaeroides that has been genetically altered to selectively express light-harvesting (LH) complexes. In the mutant strain (DP2) that lacks a peripheral light-harvesting (LH2) complex, the phospholipid composition was significantly different from that of the wild-type strain; strain DP2 showed a marked decrease in phosphatidylglycerol (PG) and large increases in cardiolipin (CL) and phosphatidylcholine (PC) indicating preferential interactions between the complexes and specific phospholipids. Substitution of the core light-harvesting (LH1) complex of Rba. sphaeroides strain DP2 with that from the purple sulfur bacterium Thermochromatium tepidum further altered the phospholipid composition, with substantial increases in PG and PE and decreases in CL and PC, indicating that the phospholipids incorporated into the ICM depend on the nature of the LH1 complex expressed. Purified LH1-reaction center core complexes (LH1-RC) from the selectively expressing strains also contained different phospholipid compositions than did core complexes from their corresponding wild-type strains, suggesting different patterns of phospholipid association between the selectively expressed LH1-RC complexes and those purified from native strains. Effects of carotenoids on the phospholipid composition were also investigated using carotenoid-suppressed cells and carotenoid-deficient species. The findings are discussed in relation to ICM morphology and specific LH complex-phospholipid interactions.
Identifiants
pubmed: 37527691
pii: S0005-2728(23)00047-6
doi: 10.1016/j.bbabio.2023.149001
pii:
doi:
Substances chimiques
Phospholipids
0
Light-Harvesting Protein Complexes
0
Cardiolipins
0
Carotenoids
36-88-4
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
149001Informations de copyright
Copyright © 2023 Elsevier B.V. All rights reserved.
Déclaration de conflit d'intérêts
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.