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Default Pro----Ala-35 Rhodobacter capsulatus cytochrome c2 shows dynamic not structural diffe

Pro----Ala-35 Rhodobacter capsulatus cytochrome c2 shows dynamic not structural differences. A 1H and 15N NMR study.

Related Articles Pro----Ala-35 Rhodobacter capsulatus cytochrome c2 shows dynamic not structural differences. A 1H and 15N NMR study.

FEBS Lett. 1990 Jan 29;260(2):225-8

Authors: Gooley PR, MacKenzie NE

Comparative analysis of nuclear Overhauser effects show that the time average conformation of the wild-type and mutant Pro----Ala-35 Rhodobacter capsulatus cytochrome c2 are indistinguishable. The ring resonances of Phe-51 and Tyr-53 show that their ring flip rates increase in P35A. NH proton exchange studies show that the exchange rates of the NH of Gly-34 and the NpiH of His-17 increase by approximately 10(2) in P35A suggesting that their respective hydrogen bonds are destabilized in this protein. However, 3JchiNH 1H and 15N chemical shift data argue that these bonds are intact. These data are compatible if the replacement of a Pro with an Ala residue forms a cavity or increases local flexibility thus reducing steric hinderance and increasing solvent accessibility.

PMID: 2153585 [PubMed - indexed for MEDLINE]



Source: PubMed
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