Cloned (Comment) | Organism |
---|---|
gene ssl0352, recombinant expression of His6-tagged YFP-tagged wild-type and mutant subunits NdhS in Escherichia coli strain BL21(DE3)pLysS | Synechocystis sp. PCC 6803 |
Protein Variants | Comment | Organism |
---|---|---|
additional information | screening of a transposon-tagged library of Synechocystis sp. 6803 cells grown under high light for subunit identification. Generation of mutantsx02ssl0352,x02ndhB (M55), Ssl0352-YFP-His6, and NdhM-YFP-His6 (two NDH-1-mediated CET (NDH-CET))-defective mutants are tagged in gene ssl0352. Construction of a ssl0352 deletion mutant and another mutant with Ssl0352 fused to yellow fluorescent protein (YFP) with a His6-tag are constructed. Immunoblotting, mass spectrometry, and confocal microscopy analyses reveal that the Ssl0352 protein resides in the thylakoid membrane and associates with the NDH-1L and NDH-1M complexes. Deletion of the ssl0352 gene considerably impairs the NDH-CET activity and also retards cell growth under high light conditions, indicating that NdhS is essential for efficient operation of NDH-CET. The high light-dependent phenotype of the two mutants results from defective NDH-CET. But the assembly of the NDH-1L and NDH-1M complexes and their content in the cells are not affected in the mutant | Synechocystis sp. PCC 6803 |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
thylakoid membrane | His6-/YFP-tagged Ssl0352 protein/subunit NdhS resides in the thylakoid membrane and associates with the NDH-1L as well as the NDH-1M complexes | Synechocystis sp. PCC 6803 | 42651 | - |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Mg2+ | required | Synechocystis sp. PCC 6803 |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
2 reduced ferredoxin [iron-sulfur] cluster + plastoquinone + 6 H+[side 1] | Synechocystis sp. PCC 6803 | - |
2 oxidized ferredoxin [iron-sulfur] cluster + plastoquinol + 7 H+[side 2] | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Synechocystis sp. PCC 6803 | - |
- |
- |
Purification (Comment) | Organism |
---|---|
native enzyme complex from membrane fraction of Synechocystis sp. PCC 6803 cells by ultracentrifugation at 150000 x g, isolation of thylakoid membranes. Recombinant His6-tagged YFP-tagged wild-type and mutant subunits NdhS from Escherichia coli strain BL21(DE3)pLysS by nickel affinity chromatography | Synechocystis sp. PCC 6803 |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
2 reduced ferredoxin [iron-sulfur] cluster + plastoquinone + 6 H+[side 1] | - |
Synechocystis sp. PCC 6803 | 2 oxidized ferredoxin [iron-sulfur] cluster + plastoquinol + 7 H+[side 2] | - |
? |
Synonyms | Comment | Organism |
---|---|---|
NADPH:plastoquinone oxidoreductase complex | - |
Synechocystis sp. PCC 6803 |
NDH-1 complex | - |
Synechocystis sp. PCC 6803 |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
7 | - |
assay at | Synechocystis sp. PCC 6803 |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
Ferredoxin | - |
Synechocystis sp. PCC 6803 | |
plastoquinone | - |
Synechocystis sp. PCC 6803 |
General Information | Comment | Organism |
---|---|---|
malfunction | deletion of gene ssl0352 impairs cyclic electron transfer (CET) but not the NDH-1 assembly. Deletion of the ssl0352 gene considerably impairs the NDH-CET activity and also retards cell growth under high light conditions, indicating that NdhS is essential for efficient operation of NDH-CET. The high light-dependent phenotype of the two mutants results from defective NDH-CET. But the assembly of the NDH-1L and NDH-1M complexes and their content in the cells are not affected in the mutant. No differences are observed in growth rates and photosynthetic O2 evolution between the wild-type and mutant DELTAssl0352 | Synechocystis sp. PCC 6803 |
metabolism | cyanobacterial NADPH:plastoquinone oxidoreductase, or type I NAD(P)H dehydrogenase, or the NDH-1 complex is involved in plastoquinone reduction and cyclic electron transfer (CET) around photosystem I | Synechocystis sp. PCC 6803 |
physiological function | multisubunit NDH-1 complexes of cyanobacterial are involved in CO2 uptake and cyclic electron transfer (CET) around photosystem I. Protein Ssl0352 (UniProt ID P74795), is another NDH-1 subunit, termed NdhS, in Synechocystis sp. 6803 tightly associated with the NDH-1 complex. Subunit NdhS is important for the function of NDH-1 complexes. NdhS contains a Src homology 3-like domain and might be involved in interaction of the NDH-1 complex with an electron donor. CET produces extra ATP for cell metabolism particularly under stressful conditions. The Ssl0352 protein resides in the thylakoid membrane and associates with the NDH-1L and NDH-1M complexes | Synechocystis sp. PCC 6803 |