Fine-tuning of photosynthesis requires CURVATURE THYLAKOID1-mediated thylakoid plasticity

TY - JOUR

T1 - Fine-tuning of photosynthesis requires CURVATURE THYLAKOID1-mediated thylakoid plasticity

AU - Pribil, Mathias

AU - Sandoval Ibáñez, Omar Alejandro

AU - Xu, Wenteng

AU - Sharma, Anurag

AU - Labs, Mathias

AU - Liu, Qiuping

AU - Galgenmüller, Carolina

AU - Schneider, Trang

AU - Wessels, Malgorzata

AU - Matsubara, Shizue

AU - Jansson, Stefan

AU - Wanner, Gerhard

AU - Leister, Dario

PY - 2018/3

Y1 - 2018/3

N2 - The thylakoid membrane system of higher plant chloroplasts consists of interconnected subdomains of appressed and nonappressed membrane bilayers, known as grana and stroma lamellae, respectively. CURVATURE THYLAKOID1 (CURT1) protein complexes mediate the shape of grana stacks in a dosage-dependent manner and facilitate membrane curvature at the grana margins, the interface between grana and stroma lamellae. Although grana stacks are highly conserved among land plants, the functional relevance of grana stacking remains unclear. Here, we show that inhibiting CURT1-mediated alteration of thylakoid ultrastructure in Arabidopsis (Arabidopsis thaliana) reduces photosynthetic efficiency and plant fitness under adverse, controlled, and natural light conditions. Plants that lack CURT1 show less adjustment of grana diameter, which compromises regulatory mechanisms like the photosystem II repair cycle and state transitions. Interestingly, CURT1A suffices to induce thylakoid membrane curvature in planta and thylakoid hyperbending in plants overexpressing CURT1A. We suggest that CURT1 oligomerization is regulated at the posttranslational level in a light-dependent fashion and that CURT1-mediated thylakoid plasticity plays an important role in fine-tuning photosynthesis and plant fitness during challenging growth conditions.

AB - The thylakoid membrane system of higher plant chloroplasts consists of interconnected subdomains of appressed and nonappressed membrane bilayers, known as grana and stroma lamellae, respectively. CURVATURE THYLAKOID1 (CURT1) protein complexes mediate the shape of grana stacks in a dosage-dependent manner and facilitate membrane curvature at the grana margins, the interface between grana and stroma lamellae. Although grana stacks are highly conserved among land plants, the functional relevance of grana stacking remains unclear. Here, we show that inhibiting CURT1-mediated alteration of thylakoid ultrastructure in Arabidopsis (Arabidopsis thaliana) reduces photosynthetic efficiency and plant fitness under adverse, controlled, and natural light conditions. Plants that lack CURT1 show less adjustment of grana diameter, which compromises regulatory mechanisms like the photosystem II repair cycle and state transitions. Interestingly, CURT1A suffices to induce thylakoid membrane curvature in planta and thylakoid hyperbending in plants overexpressing CURT1A. We suggest that CURT1 oligomerization is regulated at the posttranslational level in a light-dependent fashion and that CURT1-mediated thylakoid plasticity plays an important role in fine-tuning photosynthesis and plant fitness during challenging growth conditions.

U2 - 10.1104/pp.17.00863

DO - 10.1104/pp.17.00863

M3 - Journal article

C2 - 29374108

SN - 0032-0889

VL - 176

SP - 2351

EP - 2364

JO - Plant Physiology

JF - Plant Physiology

IS - 3

ER -