Alkylation of cysteine-containing peptides to mimic palmitoylation

• Published in: The journal of peptide research Vol. 55; no. 2; pp. 140 - 147
• Main Authors: Wilkinson, T.A., Yin, J., Pidgeon, C., Post, C.B.
• Format: Journal Article
• Language: English
• Published: Copenhagen, Denmark Munksgaard International Publishers 01.02.2000; Wiley
• Subjects: Alkylation; alphavirus assembly; Amino Acid Sequence; Biochemical Research Methods; Biochemistry & Molecular Biology; Cysteine - chemistry; Life Sciences & Biomedicine; Molecular Mimicry; Molecular Sequence Data; Palmitic Acid - metabolism; palmitoylation; Peptides - chemistry; post-translational modification; Protein Processing, Post-Translational; protein-membrane interactions; Science & Technology; ACTIVATION; ATTACHMENT; ACYLATION; GLYCOPROTEINS; protein-membrane interactions; SITE-DIRECTED MUTATIONS; MATURATION; modification; PLASMA-MEMBRANE; post-translational; FAMILY; alphavirus assembly; MEMBRANE-PROTEINS; ASSOCIATION; palmitoylation
• ISSN: 1397-002X; 1399-3011
• DOI: 10.1034/j.1399-3011.2000.00164.x

: Numerous proteins that are involved in cell signaling and viral replication require post‐translational modification by palmitoylation to function properly. The molecular details by which this palmitoyl modification affects protein function remain poorly understood. To facilitate in vitro biochemical and structural studies of the role of palmitoylation on protein function, a method was developed for alkylating peptides with saturated C16 groups at cysteine residues and demonstrated using peptides derived from the palmitoylated region of Sindbis virus E2 glycoprotein. The synthetic approach takes advantage of disulfide chemistry to specifically modify only the cysteine residues within peptides and covalently links C16 groups via disulfide bridges using a new thioalkylating reagent, hexyldexyl‐dithiopyridine. The chemistry presented here takes place in solution under mild conditions without the need for protection of the peptide functional groups. A method for purifying these modified peptides is also described. This protocol can be of general use to investigators studying the role of palmitoylation in biological systems.