RUDOLPH, R and SIEBENDRITT, R and KIEFHABER, T (1992) REVERSIBLE UNFOLDING AND REFOLDING BEHAVIOR OF A MONOMERIC ALDOLASE FROM STAPHYLOCOCCUS-AUREUS. PROTEIN SCIENCE, 1 (5). pp. 654-666. ISSN 0961-8368, 1469-896X
Full text not available from this repository.Abstract
Thermal and GdmCl-induced unfolding transitions of aldolase from Staphylococcus aureus are reversible under a variety of solvent conditions. Analysis of the transitions reveals that no partially folded intermediates can be detected under equilibrium conditions. The stability of the enzyme is very low with a DELTA-G0 value of -9 +/- 2 kJ/mol at 20-degrees-C. The kinetics of unfolding and refolding of aldolase are complex and comprise at least one fast and two slow reactions. This complexity arises from prolyl isomerization reactions in the unfolded chain, which are kinetically coupled to the actual folding reaction. Comparison with model calculations shows that at least two prolyl peptide bonds give rise to the observed slow folding reactions of aldolase and that all of the involved bonds are presumably in the trans conformation in the native state. The rate constant of the actual folding reaction is fast with a relaxation time of about 15 s at the midpoint of the folding transition at 15-degrees-C. The data presented on the folding and stability of aldolase are comparable to the properties of much smaller proteins. This might be connected with the simple and highly repetitive tertiary structure pattern of the enzyme, which belongs to the group of alpha/beta barrel proteins.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | I FRUCTOSE-1,6-BISPHOSPHATE ALDOLASE; GLOBULAR-PROTEIN STRUCTURE; SLOW FOLDING REACTIONS; RIBONUCLEASE-A; PROLINE ISOMERIZATION; TRYPTOPHAN SYNTHASE; ESCHERICHIA-COLI; ALPHA-SUBUNIT; MECHANISM; DEHYDROGENASE; ALPHA/BETA-BARREL; FOLDING INTERMEDIATES; PROLYL ISOMERIZATION; PROTEIN FOLDING KINETICS; 2-STATE MODEL |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54564 |
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