Introduction
The insulin receptor (INSR) is a receptor tyrosine kinase that plays a crucial role in mediating the diverse effects of insulin. Upon insulin binding to INSR, glucose uptake is stimulated. The INSR precursor undergoes post-translational cleavage into two chains, alpha and beta, which are covalently linked, following the removal of the precursor signal peptide. Insulin binding triggers the phosphorylation of various intracellular substrates, including insulin receptor substrates (IRS1, 2, 3, 4), SHC, GAB1, CBL, and other signaling intermediaries. These phosphorylated proteins act as docking sites for signaling proteins containing Src-homology-2 domains (SH2 domain), which specifically recognize different phosphotyrosine residues. Notable examples include the p85 regulatory subunit of PI3K and SHP2.
Description
Recombinant Human Insulin Receptor, produced in HEK cells, is a single, glycosylated polypeptide chain encompassing amino acids 28-944 of the short isoform (HIR-A, Uniprot accession # P06213-2). This includes the complete alpha subunit and the extracellular domain of the beta subunit. It comprises a total of 927 amino acids, resulting in a calculated molecular mass of 105.9 kDa. However, it migrates at approximately 160 kDa on SDS-PAGE. The INSR is fused to a 2 amino acid N-terminal linker, a 2 amino acid C-terminal linker, and a 6 amino acid His tag at the C-terminus. The purification of Human INSR is achieved through proprietary chromatographic techniques.
Physical Appearance
White lyophilized powder that appears white after filtration.
Formulation
INSR underwent filtration at 0.4 µm and subsequent lyophilization from a solution of 0.5 mg/ml in 0.05 M phosphate buffer and 0.075 M NaCl, pH 7.4.
Solubility
To prepare a working solution, it is recommended to add deionized water to achieve a concentration of 0.5 mg/ml. Allow the lyophilized pellet to dissolve completely. Please note that INSR is not sterile. Before using it in cell culture, ensure to filter the product through an appropriate sterile filter.
Stability
The lyophilized protein should be stored at -20°C. After reconstitution, aliquot the product to prevent repeated freeze-thaw cycles. The reconstituted protein remains stable at 4°C for a limited period.
Purity
The purity of the protein is determined to be greater than 95.0% based on SDS-PAGE analysis.
Synonyms
Insulin receptor, IR, EC 2.7.10.1, CD220, INSR, HHF5.
Amino Acid Sequence
ASHLYPGEVC PGMDIRNNLT RLHELENCSV IEGHLQILLM FKTRPEDFRD LSFPKLIMIT DYLLLFRVYG LESLKDLFPN LTVIRGSRLF FNYALVIFEM VHLKELGLYN LMNITRGSVR IEKNNELCYL ATIDWSRILD SVEDNYIVLN KDDNEECGDI CPGTAKGKTN CPATVINGQF VERCWTHSHC QKVCPTICKS HGCTAEGLCC HSECLGNCSQ PDDPTKCVAC RNFYLDGRCV ETCPPPYYHF QDWRCVNFSF CQDLHHKCKN SRRQGCHQYV IHNNKCIPEC PSGYTMNSSN LLCTPCLGPC PKVCHLLEGE KTIDSVTSAQ ELRGCTVING SLIINIRGGN NLAAELEANL GLIEEISGYL KIRRSYALVS LSFFRKLRLI RGETLEIGNY SFYALDNQNL RQLWDWSKHN LTITQGKLFF HYNPKLCLSE IHKMEEVSGT KGRQERNDIA LKTNGDQASC ENELLKFSYI RTSFDKILLR WEPYWPPDFR DLLGFMLFYK EAPYQNVTEF DGQDACGSNS WTVVDIDPPL RSNDPKSQNH PGWLMRGLKP WTQYAIFVKT LVTFSDERRT YGAKSDIIYV QTDATNPSVP LDPISVSNSS SQIILKWKPP SDPNGNITHY LVFWERQAED SELFELDYCL KGLKLPSRTW SPPFESEDSQ KHNQSEYEDS AGECCSCPKT DSQILKELEE SSFRKTFEDY LHNVVFVPRP SRKRRSLGDV GNVTVAVPTV AAFPNTSSTS VPTSPEEHRP FEKVVNKESL VISGLRHFTG YRIELQACNQ DTPEERCSVA AYVSARTMPE AKADDIVGPV THEIFENNVV HLMWQEPKEP NGLIVLYEVS YRRYGDEELH LCVSRKHFAL ERGCRLRGLS PGNYSVRIRA TSLAGNGSWT EPTYFYVTDY LDVPSNIAKK LHHHHHH.