Stress Genes: Role in Physiological Ecology
نویسندگان
چکیده
Hydrothermal environments contain steep thermal gradients and variable temperature conditions. Hyperthermophilic microorganisms, those which grow at temperatures exceeding 90°C, are common in these environments and have numerous means for tolerating hyperthermal stress. All hyperthermophiles examined produce a heteromeric chaperonin complex which is the primary protein produced during heat shock, though other proteins of unknown function are also produced. Furthermore, many hyperthermophilic proteins demonstrate sufficient intrinsic thermostability to withstand brief periods of hyperthermal stress. These organisms also produce putative thermoprotectants, such as dimyo-inositol phosphate (DIP) and cyclic diphosphoglycerate (cDPG), which may stabilize many hyperthermophilic proteins at super-optimal temperatures. Hydrostatic pressure also enhances the thermotolerance of hyperthermophiles and their proteins in vitro during exposure to heat-shock temperatures. The specific activity of six metabolic proteins remains constant during heat shock in Pyrococcus sp. strain ES4 indicating in vivo protein stabilization during periods of hyperthermal stress.
منابع مشابه
Evaluation of physiological and molecular responses of two rice cultivars to arsenic toxicity
Arsenic (As) toxicity can be a hazardous threat to sustainable agriculture and human health. In order to investigate the effect of As (0, 25 and 50 µM) on growth, physiological traits and expression of As and Fe transporters in Tarom hashemi and Fajr rice cultivars, a factorial experiment based on a completely randomized design was conducted in 2020 in greenhouse conditions at Ayatollah Amoli B...
متن کاملRoles of ascorbic acid on physiological, biochemical and molecular system of Lycopersicon esculentum Mill. against salt stress
Tomato is one of the important plants in the world as a food, medicine etc. it is sensitive to abiotic stresses and its crop is affected by them. Moreover, Ascorbic acid (AsA) is one of the universal of plant defence mechanism against the stresses specially salinity and drought to scavenger’s reactive oxygen species. According to global warming and scarcity of water resources, subsequently dryi...
متن کاملThe effect of Salt Stress on some Morpho-Physiological and Molecular Traits of Transgenic Tomato Plants of T3 Containing cry1Ab Gene
Salinity stress affects morpho-physiological and biochemical traits of plants. The transgenic Bt plants play a significant role in pest control, but their response and ability to cope with environmental stresses still need to be evaluated. Therefore, effect of salinity stress at 0, 50, 100, 150, and 200 mM on morphological, physiological, and molecular traits of T3 transgenic tomato plants cont...
متن کاملEffect of Exogenous Brassinosteroid Application on Grain Yield, some Physiological Traits and Expression of Genes Related to This Hormone Signaling Pathway in Wheat under Drought Stress
To investigate the effect of exogenous brassinosteroid application on grain yield, catalase, chlorophyll content, membrane mtability index and gene expression of some genes involving in brassinosteroid signaling pathway (BES1 and BRI1) under drought stress, a split-split plot on randomized complete block design with three replications was conducted at the experimental field of Seed and Plant Im...
متن کاملGene expression under chronic heat stress in populations of the mustard hill coral (Porites astreoides) from different thermal environments.
Recent evidence suggests that corals can acclimatize or adapt to local stress factors through differential regulation of their gene expression. Profiling gene expression in corals from diverse environments can elucidate the physiological processes that may be responsible for maximizing coral fitness in their natural habitat and lead to a better understanding of the coral's capacity to survive t...
متن کاملStress Genes: Role in Physiological Ecology
The purpose of this article is to provide an introductory overview of stress-gene transcription in archaea for those unfamiliar with the topic. Archaea are diverse and inhabit disparate ecosystems (very cold or hot, temperate, etc.). The study of their stress genes should reveal a variety of strategies for cell survival and suggest manifold applications. Survival relies on the mechanisms of tra...
متن کامل