PDBsum entry 6hqb

Photosynthesis

PDB id: 6hqb

Contents

Protein chains

751 a.a.

731 a.a.

80 a.a.

141 a.a.

69 a.a.

143 a.a.

40 a.a.

40 a.a.

70 a.a.

137 a.a.

31 a.a.

Ligands

CLA ×93

PQN ×2

SF4 ×3

BCR ×14

LHG ×4

45D

ECH ×2

LMG ×2

SQD ×2

C7Z ×2

LMT

EQ3

Metals

_CL

_CA ×2

References listed in PDB file

Key reference

• Title: Crystal structure of photosystem I monomer from synechocystis pcc 6803.
• Authors: S.Y.Netzer-El, I.Caspy, N.Nelson.
• Ref.: Front Plant Sci, 2018, 9, 1865. [DOI no: 10.3389/fpls.2018.01865]
• PubMed id: 30662446

Abstract

A single histidine addition to the C-terminus of PsaL of Synechocystis sp. PCC 6803 was previously reported by our lab to shift the trimer-to-monomer ratio of PSI in favor of the monomeric form. P700 re-reduction and NADP⁺ photo-reduction measurements of the PsaL^HIS strain show no effect on PSI activity in comparison to the WT trimeric PSI. Crystal structure of the PsaL^HIS monomeric PSI reveals several alterations that occurred in the trimerisation site of PSI, primarily a deformation of the C-terminus of PsaL and loss of chlorophyll a and β-carotene molecules.