A recurring two-hydrogen-bond motif incorporating a serine or threonine residue is found both at alpha-helical N termini and in other situations.

Abstract excerpt

Side-chain hydroxyl residues in protein crystal structures often form hydrogen bonds with main-chain atoms. The most common bond arrangement is a four to five residue motif in which a serine or threonine is the first residue forming two characteristic hydrogen bonds to residues ahead of it in sequence. We call them ST-motifs, by analogy with the term Asx-motif we suggested for the related motifs with aspartate...

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