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Boc-D-Tyr(OtBu)-Aib-Glu(OtBu)-Gly-OH is a protected tetrapeptide used in peptide synthesis. The Boc (tert-Butoxycarbonyl) group protects the N-terminus of the D-tyrosine (D-Tyr) residue, preventing it from reacting during synthesis. The side chain hydroxyl group of D-tyrosine and the carboxyl group of glutamic acid (Glu) are protected by OtBu (tert-butyl) groups, which shield these functional groups until selective deprotection is needed. Aib (α-aminoisobutyric acid), known for its ability to induce helical structures, is the third residue, and Gly (Glycine), the final amino acid, has a free carboxyl group at the C-terminus, indicated by -OH, allowing for further coupling or modifications. This peptide incorporates D-tyrosine, Aib, glutamic acid, and glycine into peptide sequences, with specific protections to ensure controlled and efficient synthesis.
