Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures

The ability to produce medium chain length aliphatic hydrocarbons is strictly conserved in all photosynthetic cyanobacteria, but the molecular function and biological significance of these compounds still remain poorly understood. This study gives a detailed view to the changes in intracellular hydr...

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Autores principales:	Eerika Vuorio, Kati Thiel, Duncan Fitzpatrick, Tuomas Huokko, Jari Kämäräinen, Hariharan Dandapani, Eva-Mari Aro, Pauli Kallio
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	cyanobacteria Synechocystis sp. PCC 6803 hydrocarbon saturation alkane alkene membrane fluidity Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/1908a36dc32a416cb19c1b90abe9e3b9
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spelling	oai:doaj.org-article:1908a36dc32a416cb19c1b90abe9e3b92021-12-01T05:45:54ZHydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures1664-302X10.3389/fmicb.2021.781864https://doaj.org/article/1908a36dc32a416cb19c1b90abe9e3b92021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmicb.2021.781864/fullhttps://doaj.org/toc/1664-302XThe ability to produce medium chain length aliphatic hydrocarbons is strictly conserved in all photosynthetic cyanobacteria, but the molecular function and biological significance of these compounds still remain poorly understood. This study gives a detailed view to the changes in intracellular hydrocarbon chain saturation in response to different growth temperatures and osmotic stress, and the associated physiological effects in the model cyanobacterium Synechocystis sp. PCC 6803. We show that the ratio between the representative hydrocarbons, saturated heptadecane and desaturated heptadecene, is reduced upon transition from 38°C toward 15°C, while the total content is not much altered. In parallel, it appears that in the hydrocarbon-deficient ∆ado (aldehyde deformylating oxygenase) mutant, phenotypic and metabolic changes become more evident under suboptimal temperatures. These include hindered growth, accumulation of polyhydroxybutyrate, altered pigment profile, restricted phycobilisome movement, and ultimately reduced CO2 uptake and oxygen evolution in the ∆ado strain as compared to Synechocystis wild type. The hydrocarbons are present in relatively low amounts and expected to interact with other nonpolar cellular components, including the hydrophobic part of the membrane lipids. We hypothesize that the function of the aliphatic chains is specifically associated with local fluidity effects of the thylakoid membrane, which may be required for the optimal movement of the integral components of the photosynthetic machinery. The findings support earlier studies and expand our understanding of the biological role of aliphatic hydrocarbons in acclimation to low temperature in cyanobacteria and link the proposed role in the thylakoid membrane to changes in photosynthetic performance, central carbon metabolism, and cell growth, which need to be effectively fine-tuned under alternating conditions in nature.Eerika VuorioKati ThielDuncan FitzpatrickTuomas HuokkoJari KämäräinenHariharan DandapaniEva-Mari AroPauli KallioFrontiers Media S.A.articlecyanobacteriaSynechocystis sp. PCC 6803hydrocarbon saturationalkanealkenemembrane fluidityMicrobiologyQR1-502ENFrontiers in Microbiology, Vol 12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cyanobacteria Synechocystis sp. PCC 6803 hydrocarbon saturation alkane alkene membrane fluidity Microbiology QR1-502
spellingShingle	cyanobacteria Synechocystis sp. PCC 6803 hydrocarbon saturation alkane alkene membrane fluidity Microbiology QR1-502 Eerika Vuorio Kati Thiel Duncan Fitzpatrick Tuomas Huokko Jari Kämäräinen Hariharan Dandapani Eva-Mari Aro Pauli Kallio Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures
description	The ability to produce medium chain length aliphatic hydrocarbons is strictly conserved in all photosynthetic cyanobacteria, but the molecular function and biological significance of these compounds still remain poorly understood. This study gives a detailed view to the changes in intracellular hydrocarbon chain saturation in response to different growth temperatures and osmotic stress, and the associated physiological effects in the model cyanobacterium Synechocystis sp. PCC 6803. We show that the ratio between the representative hydrocarbons, saturated heptadecane and desaturated heptadecene, is reduced upon transition from 38°C toward 15°C, while the total content is not much altered. In parallel, it appears that in the hydrocarbon-deficient ∆ado (aldehyde deformylating oxygenase) mutant, phenotypic and metabolic changes become more evident under suboptimal temperatures. These include hindered growth, accumulation of polyhydroxybutyrate, altered pigment profile, restricted phycobilisome movement, and ultimately reduced CO2 uptake and oxygen evolution in the ∆ado strain as compared to Synechocystis wild type. The hydrocarbons are present in relatively low amounts and expected to interact with other nonpolar cellular components, including the hydrophobic part of the membrane lipids. We hypothesize that the function of the aliphatic chains is specifically associated with local fluidity effects of the thylakoid membrane, which may be required for the optimal movement of the integral components of the photosynthetic machinery. The findings support earlier studies and expand our understanding of the biological role of aliphatic hydrocarbons in acclimation to low temperature in cyanobacteria and link the proposed role in the thylakoid membrane to changes in photosynthetic performance, central carbon metabolism, and cell growth, which need to be effectively fine-tuned under alternating conditions in nature.
format	article
author	Eerika Vuorio Kati Thiel Duncan Fitzpatrick Tuomas Huokko Jari Kämäräinen Hariharan Dandapani Eva-Mari Aro Pauli Kallio
author_facet	Eerika Vuorio Kati Thiel Duncan Fitzpatrick Tuomas Huokko Jari Kämäräinen Hariharan Dandapani Eva-Mari Aro Pauli Kallio
author_sort	Eerika Vuorio
title	Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures
title_short	Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures
title_full	Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures
title_fullStr	Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures
title_full_unstemmed	Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures
title_sort	hydrocarbon desaturation in cyanobacterial thylakoid membranes is linked with acclimation to suboptimal growth temperatures
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/1908a36dc32a416cb19c1b90abe9e3b9
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Hydrocarbon Desaturation in Cyanobacterial Thylakoid Membranes Is Linked With Acclimation to Suboptimal Growth Temperatures

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