When PSII receives more light than PSI, plastoquinone becomes predominantly reduced, resulting in activation of the LHCII kinase. The kinase phosphorylates LHCII, resulting in migration of LHCII away from the granal region where it can associate with PSI, thereby adjusting the relative excitation of PSII and PSI.

TLS Online TPP Program

#Id: 9020

#Unit 6. System Physiology – Plant

Thioredoxins occur in multiple forms and have conserved structures to interact with target enzymes

TLS Online TPP Program

#Id: 9021

#Unit 6. System Physiology – Plant

There are Seven different types of thioredoxin in cells, Trx f, m, x, y, and z are located in the chloroplasts, o in mitochondria, and h in the cytosol, endoplasmic reticulum, and plasma membrane.

TLS Online TPP Program

#Id: 9022

#Unit 6. System Physiology – Plant

Trx proteins are characterized by a canonical disulfide active site consisting of Cys‐Gly‐Pro‐ Cys

TLS Online TPP Program

#Id: 9023

#Unit 6. System Physiology – Plant

Trx have common tertiary structure called the thioredoxin fold, which consists of five antiparallel beta sheets sandwiched between three alpha helices.

TLS Online TPP Program

#Id: 9024

#Unit 6. System Physiology – Plant

Trx is regulated by PSII & PSI

TLS Online TPP Program

#Id: 9025

#Unit 6. System Physiology – Plant