The development of high-performance liquid chromatographic analysis of allyl and allyloxycarbonyl side-chain-protected phenylthiohydantoin amino acids.
Ten phenylthiohydantoin (PTH) amino acids possessing allyl (Al) or allyloxycarbonyl (Aloc) side-chain-protecting groups have been characterized by high-performance liquid chromatography for use in Edman degradation sequence analysis. Optimized separation of side-chain-protected and -unprotected PTH amino acids was achieved on a C-18 reversed-phase column with a two-step gradient spanning 32 min. Five of the side-chain-protected amino acids [Cys(Al), Cys(Aloc), Lys(Aloc), Thr(Aloc), Tyr(Al)] were completely stable to the conditions of PTH derivatization, four [Asp(OAl), Arg(Aloc)2, Glu(OAl), Ser(Aloc)] were partially deprotected during PTH derivatization, and one [His(Aloc)] was completely deprotected during PTH derivatization. All allyl-based derivatives were well resolved from their side-chain-unprotected counterparts. Studies on the stability to piperidine treatment showed Asp(OAl), Cys(Al), Glu(OAl), Lys(Aloc), Thr(Aloc), and Tyr(Al), and possibly Arg(Aloc)2 and Ser(Aloc), to be suitable for peptide synthesis by 9-fluorenylmethoxycarbonyl (Fmoc)-based chemistry. Edman degradation of Al and Aloc side-chain-protected Conus geographus Lys9-alpha-conotoxin GI synthesized on 4-methylbenzhydrylamine-copoly(styrene-1%-DVB)-resin demonstrated the usefulness of these derivatives for solid-phase preview sequence analysis.
Fields
C G
CG
Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis 55455.
Loffet
A
A
Kates
S A
SA
Fields
G B
GB
D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis* / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D010669:Phenylthiohydantoin / Q000737:chemistry*
D000596:Amino Acids; D010669:Phenylthiohydantoin