A Database of Alkaline-Earth-Coordinated Peptide Cross Sections: Insight into General Aspects of Structure |
| |
| Authors: | Jonathan M Dilger Stephen J Valentine Matthew S Glover David E Clemmer |
| |
| Institution: | 1. Department of Chemistry, Indiana University, Bloomington, IN, 47405, USA
2. Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA
|
| |
| Abstract: | A database of 1470 collision cross sections (666 doubly- and 804 triply-charged) of alkaline-earth-coordinated tryptic peptide ions where the cation (M2+) correspond to Mg2+, Ca2+, or Ba2+] is presented. The utility of such an extensive set of measurements is illustrated by extraction of general properties of M2+-coordinated peptide structures. Specifically, we derive sets of intrinsic size parameters (ISPs) for individual amino acid residues for M2+-coordinated peptides. Comparison of these parameters with existing ISPs for protonated peptides suggests that M2+ binding occurs primarily through interactions with specific polar aliphatic residues (Asp, Ser, and Thr) and the peptide backbone. A comparison of binding interactions for these alkaline-earth metals with interactions reported previously for alkali metals is provided. Finally, we describe a new analysis in which ISPs are used as probes for assessing peptide structure based on amino acid composition.  | |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
