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TitleThe structure of the stress-induced photosystem I-IsiA antenna supercomplex.
Journal, issue, pagesNat Struct Mol Biol, Vol. 26, Issue 6, Page 443-449, Year 2019
Publish dateMay 27, 2019
AuthorsHila Toporik / Jin Li / Dewight Williams / Po-Lin Chiu / Yuval Mazor /
PubMed AbstractPhotochemical conversion in oxygenic photosynthesis takes place in two large protein-pigment complexes named photosystem II and photosystem I (PSII and PSI, respectively). Photosystems associate with ...Photochemical conversion in oxygenic photosynthesis takes place in two large protein-pigment complexes named photosystem II and photosystem I (PSII and PSI, respectively). Photosystems associate with antennae in vivo to increase the size of photosynthetic units to hundreds or thousands of pigments. Regulation of the interactions between antennae and photosystems allows photosynthetic organisms to adapt to their environment. In low-iron environments, cyanobacteria express IsiA, a PSI antenna, critical to their survival. Here we describe the structure of the PSI-IsiA complex isolated from the mesophilic cyanobacterium Synechocystis sp. PCC 6803. This 2-MDa photosystem-antenna supercomplex structure reveals more than 700 pigments coordinated by 51 subunits, as well as the mechanisms facilitating the self-assembly and association of IsiA with multiple PSI assemblies.
External linksNat Struct Mol Biol / PubMed:31133699
MethodsEM (single particle)
Resolution3.48 Å
Structure data

0524

6nwa

EMDB-0524, PDB-6nwa:
The structure of the photosystem I IsiA super-complex
Method: EM (single particle) / Resolution: 3.48 Å

Chemicals

ChemComp-LHG:
1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE / phospholipid*YM

ChemComp-LMG:
1,2-DISTEAROYL-MONOGALACTOSYL-DIGLYCERIDE

ChemComp-CL0:
CHLOROPHYLL A ISOMER

ChemComp-CLA:
CHLOROPHYLL A

ChemComp-PQN:
PHYLLOQUINONE

ChemComp-SF4:
IRON/SULFUR CLUSTER

ChemComp-BCR:
BETA-CAROTENE

ChemComp-LMT:
DODECYL-BETA-D-MALTOSIDE / detergent*YM

ChemComp-CA:
Unknown entry

Source
  • synechocystis sp. pcc 6803 (bacteria)
KeywordsPHOTOSYNTHESIS / Photosystem / Antenna / Chlorophyll / Membrane

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