Thermal stability of dihydrofolate reductase and its fused proteins with oligopeptides.


Two fused proteins of dihydrofolate reductase (DHFR) with oligopeptides were prepared by a recombinant DNA method. One of these, DHFR-IQI, has three (Ile-Gln-Ile) and the other, DHFR-lek, has eight (Ile-Arg-Met-Tyr-Gly-Gly-Phe-Leu) additional amino acid residues at the C terminals; in both proteins, Cys152 of wild DHFR is replaced by Glu. The thermal transition of the proteins was measured by CD and DSC at pH 7.0 and compared with that of wild DHFR. The results show that the thermal stability of DHFR-IQI is the same as that of the wild DHFR and that of DHFR-lek is less than that of the former two DHFRs. Analysis of the DSC data of DHFR-IQI indicates that the thermal transition is a three-state one. Data from both DSC and CD measurements suggest the association of DHFR-lek molecules. Study holds ProTherm entries: 2803, 2804 Extra Details: additive : EDTA(0.2 mM),CD measurements are at 220nm Escherichia coli dihydrofolate reductase; Thermal stability

Submission Details

ID: cvoYbBZC4

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:20 p.m.

Version: 1

Publication Details
Uedaira H;Kidokoro S;Iwakura M;Honda S;Ohashi S,Ann. N. Y. Acad. Sci. (1990) Thermal stability of dihydrofolate reductase and its fused proteins with oligopeptides. PMID:2075977
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 Dihydrofolate reductase P0ABQ5 DYR_ECOL6
100.0 Dihydrofolate reductase P0ABQ4 DYR_ECOLI
100.0 Dihydrofolate reductase P0ABQ6 DYR_SHIFL
96.2 Dihydrofolate reductase P31073 DYR_CITFR
91.8 Dihydrofolate reductase P31074 DYR_KLEAE