{"title":"Increase of ATP synthesis and amino acids absorption contributes to cold adaptation in Antarctic bacterium Poseidonibacter antarcticus SM1702<sup>T</sup>.","authors":"Wen-Yue Xu, Sha-Sha Liu, Xiao-Han Guo, Peng Wang, Chun-Yang Li, Li Liao, Qi-Long Qin","doi":"10.1007/s00792-024-01372-0","DOIUrl":null,"url":null,"abstract":"<p><p>Numerous psychrophiles inhabit the cold environments that are prevalent across the global biosphere. The adaptation of psychrophiles to cold conditions has been widely studied in strains from the archaeal phylum Euryarchaeota and the bacterial class Gamma-proteobacteria. However, given the vast diversity of microorganisms in cold environments, many microbial lineages with potentially unique cold-adaptation strategies remain largely unexplored. This study investigates the cold responses of the Antarctic strain Poseidonibacter antarcticus SM1702<sup>T</sup>, a cold-adapted bacterium belonging to the class Epsilon-proteobacteria within the phylum Campylobacterota. Proteomic analysis revealed that this strain responds to low temperatures by overexpressing proteins involved in energy production and amino acid transport. Experimental results confirmed that intracellular ATP concentrations increased at low temperatures compared to higher temperatures. Low temperatures significantly reduced the strain's amino acid absorption rates, a condition that was mitigated by increased expression of membrane transporters. We propose that the impairment of membrane protein function due to low temperatures is the primary factor affecting cell growth. As a result, the strain enhances ATP synthesis and upregulates membrane transporter expression to counteract cold stress. These findings contribute to a deeper understanding of cold adaptation strategies in psychrophiles.</p>","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":"29 1","pages":"3"},"PeriodicalIF":2.6000,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Extremophiles","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1007/s00792-024-01372-0","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"BIOCHEMISTRY & MOLECULAR BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Numerous psychrophiles inhabit the cold environments that are prevalent across the global biosphere. The adaptation of psychrophiles to cold conditions has been widely studied in strains from the archaeal phylum Euryarchaeota and the bacterial class Gamma-proteobacteria. However, given the vast diversity of microorganisms in cold environments, many microbial lineages with potentially unique cold-adaptation strategies remain largely unexplored. This study investigates the cold responses of the Antarctic strain Poseidonibacter antarcticus SM1702T, a cold-adapted bacterium belonging to the class Epsilon-proteobacteria within the phylum Campylobacterota. Proteomic analysis revealed that this strain responds to low temperatures by overexpressing proteins involved in energy production and amino acid transport. Experimental results confirmed that intracellular ATP concentrations increased at low temperatures compared to higher temperatures. Low temperatures significantly reduced the strain's amino acid absorption rates, a condition that was mitigated by increased expression of membrane transporters. We propose that the impairment of membrane protein function due to low temperatures is the primary factor affecting cell growth. As a result, the strain enhances ATP synthesis and upregulates membrane transporter expression to counteract cold stress. These findings contribute to a deeper understanding of cold adaptation strategies in psychrophiles.
在全球生物圈普遍存在的寒冷环境中,栖息着大量的嗜灵菌。嗜心理生物对寒冷环境的适应性已在古细菌门(Euryarchaeota)和细菌类(Gamma-proteobacteria)的菌株中得到广泛研究。然而,由于寒冷环境中的微生物种类繁多,许多具有潜在独特寒冷适应策略的微生物品系在很大程度上仍未得到研究。本研究调查了南极波塞冬杆菌(Poseidonibacter antarcticus SM1702T)菌株的低温反应。蛋白质组分析表明,该菌株通过过量表达参与能量生产和氨基酸转运的蛋白质来应对低温。实验结果证实,与高温相比,低温时细胞内 ATP 浓度增加。低温大大降低了该菌株的氨基酸吸收率,而膜转运体的表达量增加则缓解了这一状况。我们认为,低温对膜蛋白功能的损害是影响细胞生长的主要因素。因此,该菌株增强了 ATP 合成,并上调了膜转运体的表达,以抵御低温胁迫。这些发现有助于深入了解精神嗜好者的冷适应策略。
期刊介绍:
Extremophiles features original research articles, reviews, and method papers on the biology, molecular biology, structure, function, and applications of microbial life at high or low temperature, pressure, acidity, alkalinity, salinity, or desiccation; or in the presence of organic solvents, heavy metals, normally toxic substances, or radiation.