Abstract
The genome of the model cyanobacterium, Synechococcus sp. PCC 7002, encodes two paralogs of CruA-type lycopene cyclases, SynPCC7002_A2153 and SynPCC7002_A0043, which are denoted cruA and cruP, respectively. Unlike the wild-type strain, a cruA deletion mutant is light-sensitive, grows slowly, and accumulates lycopene, γ-carotene, and 1-OH-lycopene; however, this strain still produces β-carotene and other carotenoids derived from it. Expression of cruA from Synechocystis sp. PCC 6803 (cruA 6803) in Escherichia coli strains that synthesize either lycopene or γ-carotene did not lead to the synthesis of either γ-carotene or β-carotene, respectively. However, expression of this orthologous cruA 6803 gene (sll0147) in the Synechococcus sp. PCC 7002 cruA deletion mutant produced strains with phenotypic properties identical to the wild type. CruA6803 was purified from Synechococcus sp. PCC 7002 by affinity chromatography, and the purified protein was pale yellow-green due to the presence of bound chlorophyll (Chl) a and β-carotene. Native polyacrylamide gel electrophoresis of the partly purified protein in the presence of lithium dodecylsulfate at 4 °C confirmed that the protein was yellow-green in color. When purified CruA6803 was assayed in vitro with either lycopene or γ-carotene as substrate, β-carotene was synthesized. These data establish that CruA6803 is a lycopene cyclase and that it requires a bound Chl a molecule for activity. Possible binding sites for Chl a and the potential regulatory role of the Chl a in coordination of Chl and carotenoid biosynthesis are discussed.
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Abbreviations
- BChl:
-
Bacteriochlorophyll
- Chl:
-
Chlorophyll
- DM:
-
n-Dodecyl-β-d-maltoside
- DMAP:
-
Dimethylallyl pyrophosphate
- FAD:
-
Flavin adenine dinucleotide
- FPP:
-
Farnesyl pyrophosphate
- GGP:
-
Geranyl pyrophosphate
- GGPP:
-
Geranylgeranyl pyrophosphate
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- HPLC:
-
High-performance liquid chromatography
- IPP:
-
Isopentenyl pyrophosphate
- LDS:
-
Lithium dodecylsulfate
- OG:
-
n-Octyl-β-d-glucopyranoside
- PAGE:
-
Polyacrylamide gel electrophoresis
- PMSF:
-
Phenylmethylsulfonylfluoride
- PS:
-
Photosystem
- SDS:
-
Sodium dodecylsulfate
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Acknowledgments
The authors thank Dr. Yue-hui Zhu for technical advice and assistance in some aspects of this study.
Funding
This research was supported by Grants MCB-1021725 and MCB-1613022 from the National Science Foundation to D. A. B.
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Xiong, W., Shen, G. & Bryant, D.A. Synechocystis sp. PCC 6803 CruA (sll0147) encodes lycopene cyclase and requires bound chlorophyll a for activity. Photosynth Res 131, 267–280 (2017). https://doi.org/10.1007/s11120-016-0316-0
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DOI: https://doi.org/10.1007/s11120-016-0316-0