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PDB 1UBQOpen in RCSB →

Why this structure

Ubiquitin, small globular protein; widely used for protein fold and domain reference.

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How to use the 3D viewer

Rotate & zoom: Drag to rotate the structure; scroll to zoom in/out.
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Seq ↔ 3D: In the right sidebar, open the panel to see residue numbers by chain; click a number to center the view. Hover in 3D to highlight the same residue in the panel.
Hover: Move the mouse over the structure to see residue info in the bottom-left overlay; the hovered residue is highlighted in red.
Measure: Turn on Measure in the bar, then click two atoms to see the distance (Å) and a red line.
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