A Database of Alkaline-earth-coordinated Peptide Cross Sections: Insight into General Aspects of Structure

Overview

Journal J Am Soc Mass Spectrom

Specialty Chemistry

Date 2013 Mar 21

PMID 23512423

Citations 11

Authors

Jonathan M Dilger

Stephen J Valentine

Matthew S Glover

David E Clemmer

Affiliations

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Abstract

A database of 1470 collision cross sections (666 doubly- and 804 triply-charged) of alkaline-earth-coordinated tryptic peptide ions [where the cation (M(2+)) correspond to Mg(2+), Ca(2+), or Ba(2+)] is presented. The utility of such an extensive set of measurements is illustrated by extraction of general properties of M(2+)-coordinated peptide structures. Specifically, we derive sets of intrinsic size parameters (ISPs) for individual amino acid residues for M(2+)-coordinated peptides. Comparison of these parameters with existing ISPs for protonated peptides suggests that M(2+) 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.

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