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Title: Nanoscale simulation of the thylakoid membrane response to extreme temperatures

Journal Article · · Plant, Cell and Environment
DOI: https://doi.org/10.1111/pce.14609 · OSTI ID:1974643
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [2]
  1. MSU‐DOE Plant Research Laboratory Michigan State University East Lansing Michigan USA
  2. MSU‐DOE Plant Research Laboratory Michigan State University East Lansing Michigan USA, Department of Biochemistry and Molecular Biology Michigan State University East Lansing Michigan USA
  3. MSU‐DOE Plant Research Laboratory Michigan State University East Lansing Michigan USA, Department of Biochemistry and Molecular Biology Michigan State University East Lansing Michigan USA, Plant Resilience Institute Michigan State University East Lansing Michigan USA

Abstract The thylakoid membrane is in a temperature‐sensitive equilibrium that shifts repeatedly during the life cycle in response to ambient temperature or solar irradiance. Plants respond to seasonal temperature variation by changing their thylakoid lipid composition, while a more rapid mechanism for short‐term heat exposure is required. The emission of the small organic molecule isoprene has been postulated as one such possible rapid mechanism. The protective mechanism of isoprene is unknown, but some plants emit isoprene at high temperature. We investigate the dynamics and structure for lipids within a thylakoid membrane across temperatures and varied isoprene content using classical molecular dynamics simulations. The results are compared with experimental findings for temperature‐dependent changes in the lipid composition and shape of thylakoids. The surface area, volume, and flexibility of the membrane, as well as the lipid diffusion, increase with temperature, while the membrane thickness decreases. Saturated thylakoid 34:3 glycolipids derived from eukaryotic synthesis pathways exhibit altered dynamics relative to lipids from prokaryotic synthesis paths, which could explain the upregulation of specific lipid synthesis pathways at different temperatures. Increasing isoprene concentration was not observed to have a significant thermoprotective effect on the thylakoid membranes, and that isoprene readily permeated the membrane models tested.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-91ER20021
OSTI ID:
1974643
Journal Information:
Plant, Cell and Environment, Journal Name: Plant, Cell and Environment Journal Issue: 8 Vol. 46; ISSN 0140-7791
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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