Site-Directed Biotin Labeling, Biotin-XX-AF (amber), CloverDirect

Cosmo Bio USA

Site-Directed Biotin Labeling, Biotin-XX-AF (amber), CloverDirect

16

Research Use Only

PRX-CLD02 is a TAMRA-C6-AF-charged aminoacyl-tRNA that recognizes and suppresses the UAG (amber) codon. CloverDirect™ tRNA Reagents for Site-Directed Protein Functionalization are designed for investigators who wish to incorporate unnatural amino acids at genetically defined positions of proteins using cell-free coupled transcription/translation systems, such as PUREfrex®, PURESYSTEM® and The RYTS Kit. The targeting of unnatural amino acids is genetically defined by selectively introducing UAG amber or CGGG four-base codons into translation templates. For template construction, we recommend expression plasmids from Protein Express (pROX-FL92.1: ProX-tag + His-tag) or BioComber (pURE1-4: no tags). The ProX tag is a special N-terminal peptide designed to promote incorporation of certain large unnatural amino acids requiring precise N-terminal positioning (codon 9) and a specific codon context (flanked by AAC and TCT). Codon 9 of the ProX tag can be varied between UAG, CGGG or TTT (as a control). During cell-free translation, unnatural amino acid-charged aminoacyl-tRNAs recognize either UAG amber or CGGG codons. If a UAG codon is recognized by release factor 1 (one of three termination factors), protein synthesis will be terminated. If the first three nucleotides of CGGG are recognized as a triplet codon by Arg-tRNA, the reading frame shifts to +1 and a downstream stop codon will terminate protein synthesis. Therefore, full-length translation products will contain unnatural amino acids at 100% efficiency. Product contents Unnatural aminoacyl-tRNA (One tube of unnatural aminoacyl-tRNA is sufficient for 300microL of in vitro translation reaction.) tRNA buffer Storage and stability Always store this product in the dark. This product is stable at -70°C until the expiration date which is indicated on the outside of the package. Once unnatural aminoacyl-tRNA is dissolved in tRNA buffer, it can be stored at -70°C for 2 months. Applications Fluorescent labeling Biotin labeling PEGylation Chemical crosslinking Photo-regulation of a variety of biological processes, including enzyme, receptor, and ion channel activity In addition, upon request custom services for protein expression with unnatural amino acids are available.

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