= Solution
<Protein structure> can remain similar after extensive <protein sequence> divergence has obscured a sequence-only relationship. A structural comparison may therefore reveal a conserved <protein fold>, plausible binding pocket or spatial arrangement of candidate catalytic residues that a direct sequence search misses. Such evidence can suggest a functional family and useful hypotheses.
\b[A similar fold does not uniquely determine function.] The same architecture can support different activities, and a predicted pocket does not demonstrate binding or catalysis. Confidence in the model, residue-level chemistry and independent biochemical evidence must be considered together. Structural classification complements rather than replaces sequence and experimental analysis.
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