Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Heat-shock Response
When growing plantlets or tissues of plants are shifted to 42°C and above, the synthesis of normal proteins rapidly declines and instead a set of new proteins appears. Since these proteins are known to be induced by hike in temperature, they are often called heat-shock proteins (hsp). These proteins are known to be self-regulatory in that their synthesis is switched off after 6 to 8 hours at the elevated temperature while synthesis of the normal proteins resumes. The heat-shock proteins span over a wide range of molecular weight (15 to 102 kd). Several hsps are known to be induced also by heavy metals and arsenites.
The hsps are now known to occur in representatives of all the major groups of organisms. Curiously, a pre-treatment at elevated temperature (e.g., 2 hours at 45°C) eliminates the heat-shock response on subsequent exposure to similar conditions. It is believed that heat shock protein2 protect essential enzymes and nucleic acids from denaturation. Induction of synthesis of heat-shock proteins has also been observed under field conditions. In dry fields during summer when the leaf temperature reaches or exceeds the ambient temperature (>40"C), hsp's are synthesised as under experimental conditions.
Heat-shock response involves changes in transcriptional as well as translational control. The pre-existing transcripts for normal proteins remain intact for sometime while protein synthesis ceases. How do hsp's help in heat-shock avoidance? They probably help important cellular proteins to acquire conformations that would be safe and functional under high temperature and the protein will remain in soluble state in the cytoplasm.
Explain the Mechanism of Drying? Drying as a mechanism, you will realize, involves the removal of free moisture from the surface and also moisture from the interior of the mate
Define Analysis of Amino Acid sequence on Particular Peptide? The analysis of the relative order or the sequence in which the ammo acids are arranged-along the length of the
Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4
Explain the Stages In Taxonomic Procedures? Divided into three levels or phases: 1) Alpha (α) phase, 2) Beta (β) phase, 3) Gamma (γ) phase. Alpha Taxonomy The
What is eutrophication" describe its consequences on the life of plants and animals living in such waters. Why is oxygen depletion in a eutrophicated water-body faster at nigh
What is Pulmonary Artery Banding ? Banding of pulmonary trunk is done to reduce pulmonary flow in a baby. It is seldom done for isolated ventricular septa] defect. Multiple mu
Mitral Valve Replacement : Patients who require surgery and are not candidates for BMV, CMV or OMV should have mitral valve replacement (MVR). Types of Surgery for Mitra
In 2003 nearly 70 million hectares globally were planted in genetically modi?ed crops. Of these, 73% were plants such as soybean, corn and cotton, which were modi?ed to be he
REHABILITATION OF CARDIAC SURGICAL PATIENTS The goal of nursing care of cardiac surgical patient is to make the patient to come back to his normal activities. Cardiac surgica
WHAT IS THE FUNCTION OF CELL COAT
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd