title: Using amino acids for probing structural information of cytochrome c by electrospray ionization mass spectrometry.
abstract: By using electrospray ionization mass spectrometry (ESI-MS), protein complexes of cytochrome c with amino acids were studied. Different amino acids were investigated to explore these complexes. Using these amino acids, a strategy for probing the structure of cytochrome c was established. It was found that L-Arg and L-Glu could bind with cytochrome c to form noncovalent complexes. At low pH solution, complexes between the cytochrome c molecule with several L-Arg molecules (multiple L-Arg adducts) were formed, and the number of binding ligands depended on the charge state of cytochrome c. While in neutral solution, the cytochrome c molecule complexed with only one L-Arg molecule (single L-Arg adducts). As for L-Glu, only single L-Glu adducts were formed in both acidic and neutral solutions.
authors.affiliation: Shanghai Mass Spectrometry Center, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, People's Republic of China.
authors.forename: Haojie
authors.initials: H
authors.lastname: Lu
authors.forename: Yinlong
authors.initials: Y
authors.lastname: Guo
authors.forename: Pengyuan
authors.initials: P
authors.lastname: Yang
mesh_terms: D000596:Amino Acids / Q000737:chemistry*; D000818:Animals; D045304:Cytochromes c / Q000737:chemistry*; D006736:Horses; D008024:Ligands; D015394:Molecular Structure; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D000596:Amino Acids; D008024:Ligands; D045304:Cytochromes c