Crystallization (Comment) | Organism |
---|---|
substrate-bound, ADP-aluminium fluoride-stabilized transition state complex between the DPOR components L2 and (NB)2, sitting drops by vapor diffusion, mixing of 0.001 ml of protein solution containing 7.5 mg/ml protein in 100 mM HEPES/NaOH, pH 7.5, 150 mM NaCl, 10 mM MgCl2, 50 mM NaF, and 2 mM AlCl3,with 0.001 ml of reservoir solution containing 0.1 M KCl, 0.1 M Tris, pH 8.5, and 3% wt/v PEG 6000, 17°C, X-ray diffraction structure determination and analysis at 2.1 A resolution | Prochlorococcus marinus |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Fe2+ | two redox-active [4Fe-4S] clusters, both [4Fe-4S] clusters are centered around the extended axis: the L2 cluster is symmetrically ligated by four cysteinyl ligands between the two subunits, whereas the NB cluster is asymmetrically ligated by three cysteine residues from subunit N and one aspartate residue from subunit B | Prochlorococcus marinus | |
Mg2+ | required | Prochlorococcus marinus |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
protochlorophyllide a + reduced ferredoxin + 2 ATP + 2 H2O | Prochlorococcus marinus | - |
chlorophyllide a + oxidized ferredoxin + 2 ADP + 2 phosphate | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Prochlorococcus marinus | Q7VD39 | - |
- |
Purification (Comment) | Organism |
---|---|
purification by immobilization of GST-tagged subunit L2 on glutathione resin, complex formation with purified subunits NB, and proteolytical cleavage | Prochlorococcus marinus |
Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
chlorophyllide a + oxidized ferredoxin + 2 ADP + 2 phosphate = protochlorophyllide a + reduced ferredoxin + 2 ATP + 2 H2O | dynamic switch mechanism of DPOR, catalytic mechanism and structure-function analysis, detailed overview | Prochlorococcus marinus |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
protochlorophyllide a + reduced ferredoxin + 2 ATP + 2 H2O | - |
Prochlorococcus marinus | chlorophyllide a + oxidized ferredoxin + 2 ADP + 2 phosphate | - |
? | |
protochlorophyllide a + reduced ferredoxin + 2 ATP + 2 H2O | DPOR catalyzes the formation of chlorophyllide a through ATP-dependent, stereospecific reduction of the C-17=C-18 double bond of Pchlide ring D | Prochlorococcus marinus | chlorophyllide a + oxidized ferredoxin + 2 ADP + 2 phosphate | - |
? |
Subunits | Comment | Organism |
---|---|---|
octamer | (L2)2(NB)2 enzyme complex with perfect symmetry. Subunits L2 and NifH2 both contain a subunit-bridging [4Fe-4S] cluster, whereas the [4Fe-4S] cluster at the N/B subunit interface of (NB)2 is located in an analogous position as the [8Fe-7S] P-cluster at the NifD/NifK subunit interface of (NifDK)2 | Prochlorococcus marinus |
Synonyms | Comment | Organism |
---|---|---|
dark-operative protochlorophyllide oxidoreductase | - |
Prochlorococcus marinus |
DPOR | - |
Prochlorococcus marinus |
protochlorophyllide oxidoreductase complex | - |
Prochlorococcus marinus |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
ATP | - |
Prochlorococcus marinus | |
Ferredoxin | - |
Prochlorococcus marinus |
General Information | Comment | Organism |
---|---|---|
evolution | protein-protein interaction surfaces for transition state complexes of DPOR and nitrogenase, using PDB ID code 1M34, analysis of catalytic differences and similarities between DPOR and nitrogenase, overview | Prochlorococcus marinus |
additional information | upon complex formation, substantial ATP-dependent conformational rearrangements of L2 trigger the protein-protein interactions with (NB)2 as well as the electron transduction via redox-active [4Fe-4S] clusters, dynamic interplay between L2 and (NB)2. Asp155 is responsible for positioning and/or activating a specific water molecule for the subsequent ATP hydrolysis, whereas Lys37 of the P-loop possibly assists the release of gamma-phosphate upon ATP hydrolysis | Prochlorococcus marinus |
physiological function | during chlorophyll biosynthesis in photosynthetic bacteria, cyanobacteria, green algae and gymnosperms, dark-operative protochlorophyllide oxidoreductase, a nitrogenase-like metalloenzyme, catalyzes the chemically challenging two-electron reduction of the fully conjugated ring system of protochlorophyllide a. The reduction of the C-17=C-18 double bond results in the characteristic ring architecture of all chlorophylls, thereby altering the absorption properties of the molecule and providing the basis for light-capturing and energytransduction processes of photosynthesis | Prochlorococcus marinus |