The oxygen-carrying protein myoglobin is composed of 153 amino acids, linked by

Because the length of the myoglobin molecule in solution is much less than its extended length, it is likely that the polymeric chain is folded into a compact structure. This conclusion was first reached in the 1930s when studies on the radius of gyration of certain proteins showed that they are shorter than their predicted length. The
globular structure of a soluble protein was visualized in detail by John Kendrew in 1957 when he used x-ray analysis to show that myoglobin is an assembly of rodlike chains with overall dimensions of 45 × 35 × 25 Å. It is now well established that most soluble proteins fold into globular, compact structures in solution. Discussion of those folded structures as well as how they undergo folding will be discussed at length in
the text.

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