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Figure 21-1

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Description

X-ray structure of human ubiquitin. The polypeptide is drawn in ribbon form colored in rainbow order from its N-terminus (blue) to its C-terminus (red) with the side chain of Lys 48 shown in stick form with C green and N blue. This α + β architecture is known as a β-Grasp fold because its β sheets appear to grasp its α helix. To best see this, orient the helix end-on. [Based on an X-ray structure by Charles Bugg, University of Alabama at Birmingham. PDBid 1UBQ.]