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Recent X-ray diffraction studies of muscle

Published online by Cambridge University Press:  17 March 2009

Jean Hanson
Affiliation:
Medical Research Council Biophysics Research Unit, King's College, London

Extract

An intact living muscle has such a regular structure that it diffracts light or X-rays, thereby providing patterns that contain uniquely valuable information. Interpretation of these patterns is not straightforward, but is helped by light microscopy and electron microscopy, which can often provide similar though less reliable information. At all levels of complexity, from that of the fibrils to that of the molecules, structure in a muscle is orderly. No other natural cell assembly is so suited to study by the diffraction method, and the results obtained in recent years are an outstanding example of how this method can elucidate a biological problem. In contrast to protein crystallography, where the system studied is artificial, muscle can be examined in its natural state, during normal activity. The levels of structure explored as yet in muscle are above that of the atoms in the molecules. Such structure is more commonly investigated by electron microscopy, and the application of the diffraction method to living muscle has provided a valuable check on the preparative artifacts that worry the microscopist. The great complexity of a muscle, as compared with a protein crystal, and the fact that the system is only semi-crystalline, giving a much less detailed diffraction pattern, make the problems of interpretation especially difficult. But a great deal of useful information is available about other properties of muscle and its constituents, and the flourishing state of muscle biology at present is a major factor contributing to the successful application of the diffraction method.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1968

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