alexa Thermal destruction processes in proteins involving cystine residues.
Environmental Sciences

Environmental Sciences

International Journal of Waste Resources

Author(s): Volkin DB, Klibanov AM

Abstract Share this page

Abstract To ascertain the upper limit of protein thermostability and to evaluate the introduction of additional -S-S- bridges for the enhancement of protein thermostability by site-directed mutagenesis, the stability of cystine residues at 100 degrees C has been investigated in a number of unrelated proteins. All proteins studied (more than a dozen) undergo heat-induced beta-elimination of cystine residues in the pH range from 4 to 8. The time courses of this process closely follow first-order kinetics indicating that the stability of a cystine residue is not significantly affected by its position in the polypeptide chain. Furthermore, the first-order rate constants of beta-elimination of disulfide bonds at 100 degrees C are remarkably similar for different proteins--0.8 +/- 0.3 h-1 and 0.06 +/- 0.02 h-1 at pH 8.0 and 6.0, respectively. Thus, this process is relatively independent of both the primary structure and the elements of higher structures remaining in proteins in 100 degrees C. beta-Elimination of disulfides produces free thiols that cause yet another deleterious reaction in proteins--heat-induced disulfide interchange. This reshuffling of -S-S-bonds, which is much faster than beta-elimination, has also been quantitatively characterized.
This article was published in J Biol Chem and referenced in International Journal of Waste Resources

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

  • 3rd International Conference and Expo on Oil and Gas
    July 13-14, 2017 Berlin, Germany
  • 2nd International Conference on Biochemistry
    September 28-29, 2017 Dubai, UAE
  • 3rd International Conference on Chemical Engineering
    October 2-4, 2017 Chicago, Illinois ,USA
  • 2nd Euro Global Summit and Expo on Biomass and Bioenergy
    October 12-13, 2017 London, UK
  • 2th International Conference on Environmental Toxicology and Ecological Risk Assessment
    October 19-20, 2017 Atlanta, Georgia, USA
Peer Reviewed Journals
 
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
 
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

 
© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version
adwords