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A high-affinity split-HaloTag for live-cell protein labeling
Abstract We introduce a high-affinity split-HaloTag comprised of a short peptide tag (Hpep, 14 residues) and a large, inactive fragment (cpHaloΔ3). Hpep binds to cpHaloΔ3 spontaneously with nanomolar affinity, enabling subsequent labeling with fluorescent HaloTag ligands.
Improving Split-HaloTag through Computational Protein Engineering
Abstract Split-HaloTag can be used to transform transient molecular interactions into permanent marks through chemical labeling, thereby enabling the recording of transient physiological events in individual cells. However, applications of split-HaloTag-based recorders can be limited by slow labeling rates. To address this issue, we have engineered an improved version of cpHaloΔ, the larger fragment of the split-HaloTag system.
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