ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
Small-to-moderate-angle X-ray scattering studies were performed on a troponin C solution prepared from rabbit skeletal muscle. The main feature of the scattering profile is the existence of two regions in the Guinier plot, in which data points lie on a straight line. The scattering profile was analyzed by way of a structural model with 'dumbbell' shape, based on the structure given by X-ray crystallography on troponin C. The dumbbell model shows a `quasi-' straight-line region at higher scattering angles in the Guinier plot, in addition to the intrinsic straight-line region at very small scattering angles. A ln[I(S)/S] versus S2 plot of the scattering profile at higher scattering angles gives information as to the average radius of gyration of the N-terminal and C-terminal domains of troponin C. The molecular parameters determined from small-angle X-ray scattering data of troponin C (10 mg ml−1), in the absence of Ca2+ ions, are as follows: the radius of gyration of the whole troponin C molecule is 20.4 Å and the average radius of gyration of the N- and C-terminal domains is 15.6 Å. From these radii of gyration, the center-to-center distance between the two domains is estimated to be about 26 Å.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889887086497
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