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Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Chemoselective Coupling Preserves the Substrate Integrity of Surface-Immobilized Oligonucleotides for Emulsion PCR-Based Gene Library Construction.
ACS Combinatorial Science 2017 January 10
Combinatorial bead libraries figure prominently in next-generation sequencing and are also important tools for in vitro evolution. The most common methodology for generating such bead libraries, emulsion PCR (emPCR), enzymatically extends bead-immobilized oligonucleotide PCR primers in emulsion droplets containing a single progenitor library member. Primers are almost always immobilized on beads via noncovalent biotin-streptavidin binding. Here, we describe covalent bead functionalization with primers (∼106 primers/2.8-μm-diameter bead) via either azide-alkyne click chemistry or Michael addition. The primers are viable polymerase substrates (4-7% bead-immobilized enzymatic extension product yield from one thermal cycle). Carbodiimide-activated carboxylic acid beads only react with oligonucleotides under conditions that promote nonspecific interactions (low salt, low pH, no detergent), comparably immobilizing primers on beads, but yielding no detectable enzymatic extension product. Click-functionalized beads perform satisfactorily in emPCR of a site-saturation mutagenesis library, generating monoclonal templated beads (104 -105 copies/bead, 1.4-kb amplicons). This simpler, chemical approach to primer immobilization may spur more economical library preparation for high-throughput sequencing and enable more complex surface elaboration for in vitro evolution.
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