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J Biomol Tech. 2010 September; 21(3 Suppl): S32.
PMCID: PMC2918086

ERLIC and Proteomics: Simultaneous Isolation of Phospho- and Glycopeptides and Superior Fractionation of Complex Tryptic Digests

S.W. Sze,2 P. Hao,2 H. Zhang,2 T. Guo,2 X. Li,2 J. Yang,2 J.P. Tam,2 and S.K. Lim3
1PolyLC, Inc., Columbia, MD, United States;
2School of Biological Sciences, Nanyang Technological University, Singapore;
3Institute of Medical Biology, Singapore



Electrostatic Repulsion-Hydrophilic Interaction Chromatography (ERLIC) can be used for the selective isolation of phosphopeptides from tryptic digests. The same conditions also serve for isolation of glycopeptides; from an extract of mouse brain membranes, 41% of the phosphoproteins identified were also glycosylated. In total, 544 unique glycoproteins and 922 glycosylation sites were identified. Many but not all contained sialyl- groups. ERLIC, which is easy to implement and use, identified 3-5x more sites and glycoproteins than hydrazide covalent chromatography. Analysis of the same fractions led to identification of 383 phosphoproteins and 915 phosphorylation sites. ERLIC of a tryptic digest of rat kidney tissue led to identification of 4821 proteins and 30,659 unique peptides with high confidence from two replicates. This was 36% and 64% higher, respectively, than was obtained using SCX fractionation. ERLIC identified over 120% more highly hydrophobic and basic peptides than did SCX. ERLIC could be implemented with totally volatile mobile phases, and afforded perhaps the most uniform distribution reported to date of tryptic peptides among the collected fractions. It is promising as a first dimension of multidimensional LC for fractionation of peptides.

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