NMR analysis of staphylococcal nuclease thermal quench refolding kinetics.
 

NMR analysis of staphylococcal nuclease thermal quench refolding kinetics.

http://www.ncbi.nlm.nih.gov/corehtml...REE_120x27.gif http://www.ncbi.nlm.nih.gov/corehtml...pubmed-pmc.gif Related Articles NMR analysis of staphylococcal nuclease thermal quench refolding kinetics.

Protein Sci. 1993 May;2(5):851-8

Authors: Kautz RA, Fox RO

Thermally unfolded staphylococcal nuclease has been rapidly quenched to temperatures near 0 degree C and the refolding behavior examined using an NMR kinetic experiment. Unfolded protein, exhibiting random coil chemical shifts, persists following the quench and refolds in two distinct kinetic phases. A protein folding intermediate with a trans Lys 116-Pro 117 peptide bond is transiently overpopulated and relaxes to the predominantly cis native cis-trans equilibrium. The rate of trans-->cis isomerization in the native-like nuclease intermediate is approximately 100-fold faster than that observed in a Lys-Pro model peptide. The activation enthalpy of 20 kcal/mol observed for the nuclease Lys 116-Pro 117 peptide bond is comparable to that observed for other X-Pro isomerizations.

PMID: 8495202 [PubMed - indexed for MEDLINE]



Source: PubMed