Tryptic peptide mapping of sequence 299-585 of human serum albumin by high-performance liquid chromatography and fast atom bombardment mass spectrometry.
The determination of the tryptic peptide mapping of sequence 299-585 (cyanogen bromide fragment A) of human serum albumin (HSA) by chemical and enzymatic cleavages and combined use of HPLC and FAB-MS is described. Reduction and carboxymethylation of A gave four subfragments which were separated by HPLC and digested with trypsin. Tryptic fragments were separated by HPLC and identified by FAB-MS. A total coverage of about 95% of the entire sequence was obtained. Tryptic fragments not identified include mostly single amino acids and very hydrophilic peptides which were absent in the chromatograms. The high reproducibility of the experiments and the satisfactory yield of the tryptic fragments identified demonstrate the great potential of the combined use of HPLC separation and FAB-MS analysis for the structural investigation of HSA.
Fisichella
S
S
Dipartimento di Scienze Chimiche, Università di Catania, Italy.
Foti
S
S
Maccarrone
G
G
Saletti
R
R
D000595:Amino Acid Sequence; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D008969:Molecular Sequence Data; D010449:Peptide Mapping; D015203:Reproducibility of Results; D012709:Serum Albumin / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment / Q000379:methods*; D014357:Trypsin
D012709:Serum Albumin; D014357:Trypsin