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Proteomic characterization of UV-B impact on Chlamydomonas reinhardtii.

ABSTRACT: Photosynthesis, the fundamental process using light energy to convert CO2 to organic matter, is vital for life on Earth. It relies on capturing light through light-harvesting complexes in photosystems I and II and converting light energy into chemical energy. Composition and organization of photosystem core complexes are well conserved across evolution, and are highly susceptible to photodamage. Consequently, a large diversity of photoprotective mechanisms have evolved in photoautotrophs, finely tuned for the specific light conditions. Light Harvesting Complex protein family (LHC and LHC-like families) have acquired a dual function during evolution. Members of the LHC antenna complexes of photosystems capture light energy whereas others dissipate excess energy that cannot be harnessed for photosynthesis. This process mainly occurs through non photochemical quenching (NPQ). In this work, we analysed the effect of UV-B on the proteome of Chlamydomonas.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Chlamydomonas Reinhardtii

SUBMITTER: Yohann Couté

LAB HEAD: Yohann Couté

PROVIDER: PXD048496 | Pride | 2025-01-28

REPOSITORIES: pride

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Project description:The trophic condition related proteomes of an oxygenic photosynthetic cyanobacterium Synechocystis sp. PCC 6803 (glucose tolerant strain) were analyzed to get further insights into the metabolic traits governing the early exponential growth under photoautotrophic, mixotrophic and heterotrophic conditions. The cells were grown under constant light autotrophically (AT) in low (air-level) CO2 (ATLC) and in high CO2 (ATHC), mixotrophically (MT) in low (air-level) CO2 in the presence of glucose (MTLC) and heterotrophically in low (air-level) CO2 in the presence of glucose and only 10 min exposure to light every 24 hours (Light-Activated Heterotrophic Growth; LAHGLC). The proteomes of ATHC, MTLC and LAHGLC differed substantially from that of ATLC, particularly by downregulation of the inducible carbon concentrating mechanisms (CCM) and photorespiration related enzymes. On the contrary, under carbon-rich conditions (ATHC, MTLC, LAHGLC) the cells accumulated respiratory NAD(P)H dehydrogenase I complexes in the thylakoid membrane. In glucose supplemented cultures (MTLC, LAHGLC) a distinct NDH-2 protein, NdbA, additionally accumulated in the thylakoid membrane whilst the plasma membrane localized NdbC and ARTO decreased in abundance. The light-harvesting proteins together with the photosystem I and II subunits were uniquely depleted under LAHGLC condition, accumulated under ATHC and in MTLC remained at the level of the reference ATLC condition. The accumulation of P-transporters was unique, revealing only minor differences between ATLC and ATHC but strong up-regulation in MTLC and down-regulation in LAHGLC. This likely implies that MTLC stores energy surplus in the highly energetic bonds of polyphosphate polymer that can be used under unfavorable growth conditions. It is concluded that the rigor of cell growth in MTLC condition results to a great extent from high intracellular inorganic carbon conditions created upon glucose breakdown and release of CO2, beside the direct utilization of glucose-derived carbon skeletons for growth. This combination provides the MTLC cultures with excellent conditions for growth that often exceeds that of the mere photoautotrophic growth at high CO2.

			Action	DRS
	Ctrl-R1.mgf	Mgf
	Ctrl-R1.raw	Raw
	Ctrl-R2.mgf	Mgf
	Ctrl-R2.raw	Raw
	Ctrl-R3.mgf	Mgf

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Proteomic characterization of UV-B impact on Chlamydomonas reinhardtii.

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