Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
Energetics of protein stability at extreme environmental temperatures in bacterial trigger factors
Struvay, C.; Negro, S.; Matagne, A.; Feller, G. (2013). Energetics of protein stability at extreme environmental temperatures in bacterial trigger factors. Biochemistry (Wash.) 52(17): 2982-2990. dx.doi.org/10.1021/bi4002387
In: Biochemistry (Washington). American Chemical Society: Easton, Pa.. ISSN 0006-2960; e-ISSN 1520-4995
|  |
| Auteurs | | Top |
- Struvay, C.
- Negro, S.
- Matagne, A.
- Feller, G.
|
|
|
| Abstract |
Trigger factor is the first molecular chaperone interacting cotranslationally with virtually all nascent polypeptides synthesized by the ribosome in bacteria. The stability of this primary folding assistant was investigated using trigger factors from the Antarctic psychrophile Pseudoalteromonas haloplanktis, the mesophile Escherichia coli, and the hyperthermophile Thermotoga maritima. This series covers nearly all temperatures encountered by living organisms. We show that proteins adapt their stability over the whole range of biological temperatures via adjustments of the same fundamental mechanisms, involving increases in enthalpic stabilization and decreases in unfolding rates, in parallel with the environmental temperature. Enthalpic stabilization in trigger factors is characterized by large increases in the melting temperature, Tm, ranging from 33 to 96.6 °C, associated with similarly large increases in unfolding enthalpy as revealed by differential scanning calorimetry. Stopped-flow spectroscopy shows that the folding rate constants for the three investigated proteins are similar, whereas the unfolding rate constants differ by several orders of magnitude, revealing that kinetic resistance to unfolding drives adjustments of protein stability. While the unusual stability of hyperthermophilic proteins has attracted much attention, this study indicates that they are an extreme case of a more general continuum, the other extreme being represented by natively unstable proteins from psychrophiles. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
