Abstract
Cyanobacterium Synechocystis sp. PCC 6803, a popular model organism for researches in photosynthesis and biofuel production, contains plant-like photosynthetic machineries which significantly contribute to global carbon fixation. There are 12 eukaryotic-type Ser/Thr kinases (SpkA-L) and 49 His kinases (Hik1-49) of two-component systems in the genome of Synechocystis sp. PCC 6803. They are the key regulators in sensing and transmitting stimuli including light- and glucose-mediate signal transduction. Proteomic studies were able to identify all the kinases. The majority of kinases no matter whether they have a predicted transmembrane domain were identified in the membrane fractions. Six Ser/Thr kinases (SpkA-D, F and G) and ten His kinases (Hik4, 12, 14, 21, 26–27, 29, 36, 43, and 46) were identified to have one or more of the three types of post-translational modifications: phosphorylation, acetylation, and thiol oxidation. Interestingly, SpkG has the phosphorylatable threonine residue that was aligned with the phosphorylated threonine residue in the activation loop of human CDK7, demonstrating conserved phosphorylation between cyanobacterial and human kinases. Transcriptomics and proteomics revealed differential expression of the kinases in heterotrophic and photoheterotrophic compared with photoautotrophic conditions, indicating their roles in regulating the growth modes of cyanobacteria. In summary, this review focuses on the discussions on post-transcriptional modifications, transcriptomic, and proteomic studies of Ser/Thr and His kinases. This together with our published review in 2019 present a complete story of an overview of sequences, domain architectures, and biochemical and physiological functions of cyanobacterial kinases with adequate details in the context of high throughput systems. We also emphasize the importance of discovering upstream molecules and substrates to understand the exact functions of the kinases in vivo. As an attempt, a model is proposed in which Hik31, His33, Sll1334, and IcfG are hypothesized to be critical for switching between autotrophic and heterotrophic modes based on the results from the phenotypes of the gene knockout strains combined with their post-translational modifications, and gene expression profiles.
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The authors thank the support (NSF(2010)-PFUND-217 and LEQSF(2013-16)-RD-A-15) from the US National Science Foundation’s EPSCoR Program and Louisiana RCS Program to W.X..
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ESM 1
Supplementary Fig. 1. An amino acid sequence alignment of SpkG of Synechocystis sp. PCC 6803 along with human CDK7 sequence in PDB (PDB ID: 1UA2). Activation loop (A-loop), DFG motif and the conserved threonine are labeled. Supplementary Fig. 2. a, A sequence alignment of SpkA of Synechococcus sp. PCC 7002 and Synechocystis sp. PCC 6803. Two phosphorylation sites are labeled; b, Domain architecture and phosphorylation sites of SpkA of Synechococcus sp. PCC 7002. Supplementary Fig. 3. a, A sequence alignment of A1682 of Synechococcus sp. PCC 7002 with SpkF of Synechocystis sp. PCC 6803. The phosphorylation sites are labeled in green for Synechocystis sp. PCC 6803 and in blue for Synechococcus sp. PCC 7002; b, Domain architecture and phosphorylation sites of A1682 of Synechococcus sp. PCC 7002. Supplementary Fig. 4. a, A sequence alignment of A2735 of Synechococcus sp. PCC 7002 with SpkC of Synechocystis sp. PCC 6803. The phosphorylation sites are labeled in green for Synechocystis sp. PCC 6803 and in blue for Synechococcus sp. PCC 7002; b, Domain architecture and phosphorylation sites of A2735 of Synechococcus sp. PCC 7002. Supplementary Fig. 5. Domain architectures and phosphorylation sites of A1727, A2611 and A1080 of Synechococcus sp. PCC 7002. Supplementary Fig. 6. a, A sequence alignment of A0689 of Synechococcus sp. PCC 7002 with Hik4 of Synechocystis sp. PCC 6803. The phosphorylation sites are labeled in blue for Synechococcus sp. PCC 7002; b, Domain architecture and phosphorylation sites of A0689 of Synechococcus sp. PCC 7002. Supplementary Fig. 7. a, A sequence alignment of A0049 of Synechococcus sp. PCC 7002 with Hik18 of Synechocystis sp. PCC 6803. The phosphorylation sites are labeled in blue for Synechococcus sp. PCC 7002; b, Domain architecture and phosphorylation sites of A0049 of Synechococcus sp. PCC 7002. Supplementary Fig. 8. A sequence alignment of A1639 of Synechococcus sp. PCC 7002 with Hik43 of Synechocystis sp. PCC 6803. The phosphorylation sites are labeled in green for Synechocystis sp. PCC 6803. Supplementary Fig. 9. a, A sequence alignment of A1639 of Synechococcus sp. PCC 7002 with Hik43 of Synechocystis sp. PCC 6803. The phosphorylation sites are labeled in blue for Synechococcus sp. PCC 7002; b, Domain architecture and phosphorylation sites of A1639 of Synechococcus sp. PCC 7002. Supplementary Fig. 10. Domain architectures and phosphorylation sites of A1641, A2365, A0865, A1354 and A2835 of Synechococcus sp. PCC 7002. Supplementary Fig. 11. A sequence alignment of protein kinase domains of Ser/Thr kinases of Synechococcus sp. PCC 7002 with human CDK7 sequence in PDB (PDB ID: 1UA2). Supplementary Fig. 12. Domain architecture, phosphorylation sites and acetylation sites of SpkA and SpkF of Synechocystis sp. PCC 6803. Supplementary Fig. 13. Domain architecture, phosphorylation sites and acetylation sites of Hik4, Hik26, Hik36 and Hik43 of Synechocystis sp. PCC 6803. Supplementary Fig. 14. Thiol oxidation of Hik26 of Synechocystis sp. PCC 6803. a, Domain architecture, acetylation site and oxidation and reduction site; b, Oxidation level of Hik26 at C261 under different growth conditions. Supplementary Fig. 15. a, The number of times of Synechocystis sp. PCC 6803 Ser/Thr kinases with and without predicted transmembrane domains of in membrane or soluble fractions; b, Presence of Spks in heterotrophic and photomixotrophic conditions. Supplementary Fig. 16. a, The number of times of Synechocystis sp. PCC 6803 histidine kinases with and without predicted transmembrane domains of in the membrane or soluble fractions; b, Presence of histidine kinases in the heterotrophic and photomixotrophic conditions. Supplementary Fig. 17. The ratios of kinase gene expression of Synechocystis sp. PCC 6803 under the different growth conditions. Supplementary Fig. 18. An amino acid sequence alignment of Hik31 (chromosomal gene product) and Hik47 (plasmid gene product) of Synechocystis sp. PCC 6803. Supplementary Fig. 19. A pie graph to show the distribution of photosynthesis and respiration related proteins in different groups. Number of proteins identified by mass spectrometry and proteins in cyanobase are indicated. Supplementary Fig. 20. Number of times of kinases identified by mass spectrometry from a total of 60 datasets from literature. a, Ser/Thr kinases; b, His kinases. Supplementary Fig. 21. Bacterial two-component systems. a, A typical His-Asp two-component system including a senor & histidine kinase and a response regulator; b, A His-Asp-His-Asp phosphorelay including a hybrid histidine, a linker often with a Hpt domain and a response regulator. Supplementary Fig. 22. The ratios of kinase protein levels of Synechocystis sp. PCC 6803 under different growth conditions. Average protein expression levels under different growth conditions are labeled with dot lines. Green dot line represents the ratio of photoheterotrophic/autotrophic conditions; Blue dot line represents the ratio of heterotrophic/autotrophic conditions; Red dot line represents the ratio of mixotrophic/autotrophic conditions. Some of the kinases differentially expressed under different growth conditions are labeled. Supplementary Fig. 23. The ratios of Ser/Thr kinase protein levels of Synechocystis sp. PCC 6803 for different truncated phycobilisoms. Average protein expression levels are labeled with dot lines. Blue dot line represents the ratio of the CB mutant/the wild type; Red dot line represents the ratio of the CK mutant/the wild type; Green dot line represents the ratio of the PAL mutant/the wild type. Supplementary Fig. 24. The ratios of histidine kinase protein levels of Synechocystis sp. PCC 6803 for different truncated phycobilisoms. Average protein expression levels are labeled with dot lines. Blue dot line represents the ratio of the CB mutant/the wild type; Red dot line represents the ratio of the CK mutant/the wild type; Green dot line represents the ratio of the PAL mutant/the wild type. The decreasing and increasing trends of the ratios of relative expression levels against the severeness of truncations are labeled with rectangles in pink and in blue respectively. (PDF 516 kb)
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Xu, W., Wang, Y. Post-translational Modifications of Serine/Threonine and Histidine Kinases and Their Roles in Signal Transductions in Synechocystis Sp. PCC 6803. Appl Biochem Biotechnol 193, 687–716 (2021). https://doi.org/10.1007/s12010-020-03435-2
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DOI: https://doi.org/10.1007/s12010-020-03435-2