Does trifluoroethanol affect folding pathways and can it be used as a probe of structure in transition states?


Abstract

Nonaqueous co-solvents, particularly 2,2,2-trifluoroethanol (TFE), have been used as tools to study protein folding. By analyzing FKBP12, an alpha/beta-protein that folds with two-state kinetics, we have been able to address three key questions concerning the use of TFE. First, does TFE perturb the folding pathway? Second, can the observed changes in the rate of folding and unfolding in TFE be attributed to a change in free energy of a single state? Finally, can TFE be used to infer information on secondary structure formation in the transition state? Protein engineering experiments on FKBP12, coupled with folding and unfolding experiments in 0% and 9.6% TFE, conclusively show that TFE does not perturb the folding pathway of this protein. Our results also suggest that the changes in folding and unfolding rates observed in 9.6% TFE are due to a global effect of TFE on the protein, rather than the stabilization of any elements of secondary structure in the transition state. Thus, studies with TFE and other co-solvents can be accurately interpreted only when combined with other techniques. Study holds ProTherm entries: 15054, 15055, 15056, 15057, 15058, 15059, 15060, 15061, 15062, 15063, 15064, 15065, 15066, 15067, 15068, 15069, 15070, 15071, 15072, 15073, 15074, 15075, 15076, 15077, 15078, 15079, 15080, 15081 Extra Details: dithiothreitol (DTT)(1 mM) was added in the experiment,Calculated in 0% TFE using an average mU-F (1.59 } 0.02) trifluoroethanol, protein folding, FKBP12, transition state, secondary structure

Submission Details

ID: zDRNuTyv3

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:45 p.m.

Version: 1

Publication Details
Main ER;Jackson SE,Nat. Struct. Biol. (1999) Does trifluoroethanol affect folding pathways and can it be used as a probe of structure in transition states? PMID:10467094
Additional Information

Structure view and single mutant data analysis

Study data

No weblogo for data of varying length.
Colors: D E R H K S T N Q A V I L M F Y W C G P
 

Data Distribution

Studies with similar sequences (approximate matches)

Correlation with other assays (exact sequence matches)


Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
100.0 Peptidyl-prolyl cis-trans isomerase FKBP1A P62942 FKB1A_HUMAN
100.0 Peptidyl-prolyl cis-trans isomerase FKBP1A P62943 FKB1A_RABIT
97.2 Peptidyl-prolyl cis-trans isomerase FKBP1A P18203 FKB1A_BOVIN
97.2 Peptidyl-prolyl cis-trans isomerase FKBP1A P26883 FKB1A_MOUSE
97.2 Peptidyl-prolyl cis-trans isomerase FKBP1A Q62658 FKB1A_RAT