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Structure paper

TitleDimeric and high-resolution structures of Chlamydomonas Photosystem I from a temperature-sensitive Photosystem II mutant.
Journal, issue, pagesCommun Biol, Vol. 4, Issue 1, Page 1380, Year 2021
Publish dateDec 9, 2021
AuthorsIdo Caspy / Tom Schwartz / Vinzenz Bayro-Kaiser / Mariia Fadeeva / Amit Kessel / Nir Ben-Tal / Nathan Nelson /
PubMed AbstractWater molecules play a pivotal functional role in photosynthesis, primarily as the substrate for Photosystem II (PSII). However, their importance and contribution to Photosystem I (PSI) activity ...Water molecules play a pivotal functional role in photosynthesis, primarily as the substrate for Photosystem II (PSII). However, their importance and contribution to Photosystem I (PSI) activity remains obscure. Using a high-resolution cryogenic electron microscopy (cryo-EM) PSI structure from a Chlamydomonas reinhardtii temperature-sensitive photoautotrophic PSII mutant (TSP4), a conserved network of water molecules - dating back to cyanobacteria - was uncovered, mainly in the vicinity of the electron transport chain (ETC). The high-resolution structure illustrated that the water molecules served as a ligand in every chlorophyll that was missing a fifth magnesium coordination in the PSI core and in the light-harvesting complexes (LHC). The asymmetric distribution of the water molecules near the ETC branches modulated their electrostatic landscape, distinctly in the space between the quinones and FX. The data also disclosed the first observation of eukaryotic PSI oligomerisation through a low-resolution PSI dimer that was comprised of PSI-10LHC and PSI-8LHC.
External linksCommun Biol / PubMed:34887518 / PubMed Central
MethodsEM (single particle)
Resolution2.54 - 17.1 Å
Structure data

12180

7bgi

EMDB-12180, PDB-7bgi:
Photosystem I of a temperature sensitive mutant Chlamydomonas reinhardtii
Method: EM (single particle) / Resolution: 2.54 Å

12227

7blx

EMDB-12227, PDB-7blx:
Photosystem I of a temperature sensitive mutant Chlamydomonas reinhardtii
Method: EM (single particle) / Resolution: 3.15 Å

12672

7o01

EMDB-12672, PDB-7o01:
Dimeric Photosystem I of a temperature sensitive mutant Chlamydomonas reinhardtii
Method: EM (single particle) / Resolution: 17.1 Å

Chemicals

ChemComp-CL0:
CHLOROPHYLL A ISOMER / Chlorophyll a

ChemComp-CLA:
CHLOROPHYLL A / Chlorophyll a

ChemComp-PQN:
PHYLLOQUINONE / Phytomenadione

ChemComp-SF4:
IRON/SULFUR CLUSTER / Iron–sulfur cluster

ChemComp-BCR:
BETA-CAROTENE / Β-Carotene

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

ChemComp-NKP:
(2R)-2-hydroxy-3-(phosphonooxy)propyl (9E)-octadec-9-enoate

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

ChemComp-OCA:
OCTANOIC ACID (CAPRYLIC ACID) / Caprylic acid

ChemComp-DAO:
LAURIC ACID / Lauric acid

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

ChemComp-DGA:
DIACYL GLYCEROL / Diglyceride

ChemComp-DGD:
DIGALACTOSYL DIACYL GLYCEROL (DGDG)

ChemComp-CA:
Unknown entry

ChemComp-T7X:
Phosphatidylinositol / Phosphatidylinositol

ChemComp-RRX:
(3R)-beta,beta-caroten-3-ol / Β-Cryptoxanthin

ChemComp-C7Z:
(1~{S})-3,5,5-trimethyl-4-[(1~{E},3~{E},5~{E},7~{E},9~{E},11~{E},13~{E},15~{E},17~{E})-3,7,12,16-tetramethyl-18-[(4~{S})-2,6,6-trimethyl-4-oxidanyl-cyclohexen-1-yl]octadeca-1,3,5,7,9,11,13,15,17-nonaenyl]cyclohex-3-en-1-ol

ChemComp-SPH:
SPHINGOSINE / Sphingosine

ChemComp-LUT:
(3R,3'R,6S)-4,5-DIDEHYDRO-5,6-DIHYDRO-BETA,BETA-CAROTENE-3,3'-DIOL / Lutein

ChemComp-CHL:
CHLOROPHYLL B / Chlorophyll b

ChemComp-SQD:
1,2-DI-O-ACYL-3-O-[6-DEOXY-6-SULFO-ALPHA-D-GLUCOPYRANOSYL]-SN-GLYCEROL

ChemComp-QTB:
(3~{E},5~{E},7~{E})-6-methyl-8-[(6~{R})-2,2,6-trimethylcyclohexyl]octa-3,5,7-trien-2-one

ChemComp-3PH:
1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE / Phosphatidic acid

ChemComp-PLM:
PALMITIC ACID / Palmitic acid

ChemComp-LPX:
(2S)-3-{[(R)-(2-aminoethoxy)(hydroxy)phosphoryl]oxy}-2-hydroxypropyl hexadecanoate

ChemComp-HOH:
WATER / Water

Source
  • chlamydomonas reinhardtii (plant)
  • Chlamydomonas smithii (plant)
KeywordsPHOTOSYNTHESIS / chlamydomonas / photosystem I / temperature sensitive / water molecules

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