ol8b00717_si_001.pdf (6.7 MB)
Oxazolidinone-Mediated Sequence Determination of One-Bead One-Compound Cyclic Peptide Libraries
journal contributionposted on 2018-04-04, 17:48 authored by Hader E. Elashal, Ryan D. Cohen, Heidi E. Elashal, Monika Raj
A novel one-bead one-compound (OBOC) dual ring-opening/cleavage approach for cyclic peptide sequencing was developed. The method selectively modifies serine, cysteine, threonine, and/or glutamic acid to an oxazolidinone-derived moiety, thereby increasing the susceptibility of the modified peptide backbone toward hydrolysis. The resulting linear peptide was then sequenced in 1 min by tandem mass spectrometry on a quadrupole time-of-flight instrument incorporating two-dimensional liquid chromatography and ion mobility spectrometry separation. To evaluate this approach, a library of cyclic peptides was successfully sequenced with 98% overall accuracy, demonstrating its robustness and broad substrate scope.
Oxazolidinone-Mediated Sequence DeterminationOBOCcyclic peptide sequencingOne-Bead One-Compound Cyclic Peptide Librariesion mobility spectrometry separationcyclic peptidessubstrate scopetandem mass spectrometrynovel one-bead one-compound1 minapproachquadrupole time-of-flight instrumentpeptide backboneoxazolidinone-derived moiety