Selective lectin binding and sorting was achieved using thermosensitive recombinant elastin-like polypeptide (ELP) glycoconjugates in simple centrifugation-precipitation assays. A recombinant ELP, (VPGXG) 40 , was designed to contain periodically spaced methionine residues to enable chemoselective post-synthesis modification via thioether alkylation using alkyne functional epoxides. The resulting sulfonium groups were selectively demethylated to give alkyne functionalized homocysteine residues, which were then conjugated with azido-functionalized monosaccharides to obtain ELP glycoconjugates with periodic saccharide functionality. These modifications were also found to allow modulation of ELP temperature dependent water solubility. The multivalent ELP glycoconjugates were evaluated for specific recognition, binding and separation of the lectin Ricinus communis agglutinin (RCA 120) from a complex protein mixture. RCA 120 and ELP glycoconjugate interactions were evaluated using laser scanning confocal microscopy and dynamic light scattering measurements. Due to the thermoresponsive nature of the ELP glycoconjugates, it was found that heating a mixture of galactosefunctionalized ELP and RCA 120 in complex media selectively yielded a phase 1 separated pellet of the ELP-RCA 120 complexes. Based on these results, ELP glycoconjugates show promise as designer biopolymers for selective protein binding and sorting.
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