Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases

Tian Y, Gao S, von der Heyde EL, Hallmann A, Nagel G (2018)
BMC Biology 16: 144.

Zeitschriftenaufsatz | Veröffentlicht| Englisch
 
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Tian, Yuehui; Gao, Shiqiang; von der Heyde, Eva LauraUniBi ; Hallmann, ArminUniBi ; Nagel, Georg
Abstract / Bemerkung
Background: The green algae Chlamydomonas reinhardtii and Volvox carteri are important models for studying light perception and response, expressing many different photoreceptors. More than 10 opsins were reported in C. reinhardtii, yet only two—the channelrhodopsins—were functionally characterized. Characterization of new opsins would help to understand the green algae photobiology and to develop new tools for optogenetics. Results: Here we report the characterization of a novel opsin family from these green algae: light-inhibited guanylyl cyclases regulated through a two-component-like phosphoryl transfer, called “two-component cyclase opsins” (2c-Cyclops). We prove the existence of such opsins in C. reinhardtii and V. carteri and show that they have cytosolic N- and C-termini, implying an eight-transmembrane helix structure. We also demonstrate that cGMP production is both light-inhibited and ATP-dependent. The cyclase activity of Cr2c-Cyclop1 is kept functional by the ongoing phosphorylation and phosphoryl transfer from the histidine kinase to the response regulator in the dark, proven by mutagenesis. Absorption of a photon inhibits the cyclase activity, most likely by inhibiting the phosphoryl transfer. Overexpression of Vc2c-Cyclop1 protein in V. carteri leads to significantly increased cGMP levels, demonstrating guanylyl cyclase activity of Vc2c-Cyclop1 in vivo. Live cell imaging of YFP-tagged Vc2c-Cyclop1 in V. carteri revealed a development-dependent, layer-like structure at the immediate periphery of the nucleus and intense spots in the cell periphery. Conclusions: Cr2c-Cyclop1 and Vc2c-Cyclop1 are light-inhibited and ATP-dependent guanylyl cyclases with an unusual eight-transmembrane helix structure of the type I opsin domain which we propose to classify as type Ib, in contrast to the 7 TM type Ia opsins. Overexpression of Vc2c-Cyclop1 protein in V. carteri led to a significant increase of cGMP, demonstrating enzyme functionality in the organism of origin. Fluorescent live cell imaging revealed that Vc2c-Cyclop1 is located in the periphery of the nucleus and in confined areas at the cell periphery.
Erscheinungsjahr
2018
Zeitschriftentitel
BMC Biology
Band
16
Art.-Nr.
144
ISSN
1741-7007
Page URI
https://pub.uni-bielefeld.de/record/2932838

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Tian Y, Gao S, von der Heyde EL, Hallmann A, Nagel G. Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases. BMC Biology. 2018;16: 144.
Tian, Y., Gao, S., von der Heyde, E. L., Hallmann, A., & Nagel, G. (2018). Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases. BMC Biology, 16, 144. doi:10.1186/s12915-018-0613-5
Tian, Y., Gao, S., von der Heyde, E. L., Hallmann, A., and Nagel, G. (2018). Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases. BMC Biology 16:144.
Tian, Y., et al., 2018. Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases. BMC Biology, 16: 144.
Y. Tian, et al., “Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases”, BMC Biology, vol. 16, 2018, : 144.
Tian, Y., Gao, S., von der Heyde, E.L., Hallmann, A., Nagel, G.: Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases. BMC Biology. 16, : 144 (2018).
Tian, Yuehui, Gao, Shiqiang, von der Heyde, Eva Laura, Hallmann, Armin, and Nagel, Georg. “Two-component cyclase opsins of green algae are ATP-dependent and light-inhibited guanylyl cyclases”. BMC Biology 16 (2018): 144.
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