Recombinant Human LDLR Protein (His Tag)

Beta LifeScience SKU/CAT #: BLPSN-3159

Recombinant Human LDLR Protein (His Tag)

Beta LifeScience SKU/CAT #: BLPSN-3159
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Product Overview

Tag His
Host Species Human
Accession NP_000518.1
Synonym FH, FHC, LDL R, LDL Receptor, LDLCQ2
Background LDL Receptor, also known as LDLR, is a mosaic protein which belongs to the Low density lipoprotein receptor gene family. The low density lipoprotein receptor (LDLR) gene family consists of cell surface proteins involved in receptor-mediated endocytosis of specific ligands. LDL Receptor consists of 84 amino acids (after removal of signal peptide) and mediates the endocytosis of cholesterol-rich LDL. Low density lipoprotein (LDL) is normally bound at the cell membrane and taken into the cell ending up in lysosomes where the protein is degraded and the cholesterol is made available for repression of microsomal enzyme 3-hydroxy-3-methylglutaryl coenzyme A (HMG CoA) reductase, the rate-limiting step in cholesterol synthesis. At the same time, a reciprocal stimulation of cholesterol ester synthesis takes place. LDL Receptor is a cell-surface receptor that recognizes the apoprotein B1 which is embedded in the phospholipid outer layer of LDL particles. The receptor also recognizes the apoE protein found in chylomicron remnants and VLDL remnants.
Description A DNA sequence encoding the extracellular domain of human LDLR (NP_000518.1) precursor (Met 1-Arg 788) was expressed with a C-terminal His tag.
Source HEK293
Predicted N Terminal Ala 22
AA Sequence Met 1-Arg 788
Molecular Weight The secreted recombinant human LDLR comprises 777 a.a. with a predicted molecular mass of 86 kDa. As a result of different glycosylation, it migarates with the apparent molecular mass of 110-140 kDa in SDS-PAGE under reducing conditions corresponding to the mature and immature form.
Purity >85% as determined by SDS-PAGE
Endotoxin < 1.0 EU per μg of the protein as determined by the LAL method
Bioactivity Measure by its ability to bind with human PCSK9 in a functional ELISA.1. Immobilized human PCSK9 at 10 ug/ml (100 ul/well) can bind biotinylated recombinant human LDLR. The EC50 of biotinylated human LDLR is 0.61 ug/ml.2. Immobilized mouse PCSK9 at 10 ug/ml (100 ul/well) can bind biotinylated recombinant human LDLR. The EC50 of biotinylated human LDLR is 0.12 ug/ml.
Formulation Lyophilized from sterile PBS, pH 7.4.
Stability The recombinant proteins are stable for up to 1 year from date of receipt at -70°C.
Usage For Research Use Only
Storage Store the protein under sterile conditions at -20°C to -80°C. It is recommended that the protein be aliquoted for optimal storage. Avoid repeated freeze-thaw cycles.

FAQs

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Proteins are sensitive to heat, and freeze-drying can preserve the activity of the majority of proteins. It improves protein stability, extends storage time, and reduces shipping costs. However, freeze-drying can also lead to the loss of the active portion of the protein and cause aggregation and denaturation issues. Nonetheless, these adverse effects can be minimized by incorporating protective agents such as stabilizers, additives, and excipients, and by carefully controlling various lyophilization conditions.

Commonly used protectant include saccharides, polyols, polymers, surfactants, some proteins and amino acids etc. We usually add 8% (mass ratio by volume) of trehalose and mannitol as lyoprotectant. Trehalose can significantly prevent the alter of the protein secondary structure, the extension and aggregation of proteins during freeze-drying process; mannitol is also a universal applied protectant and fillers, which can reduce the aggregation of certain proteins after lyophilization.

Our protein products do not contain carrier protein or other additives (such as bovine serum albumin (BSA), human serum albumin (HSA) and sucrose, etc., and when lyophilized with the solution with the lowest salt content, they often cannot form A white grid structure, but a small amount of protein is deposited in the tube during the freeze-drying process, forming a thin or invisible transparent protein layer.

Reminder: Before opening the tube cap, we recommend that you quickly centrifuge for 20-30 seconds in a small centrifuge, so that the protein attached to the tube cap or the tube wall can be aggregated at the bottom of the tube. Our quality control procedures ensure that each tube contains the correct amount of protein, and although sometimes you can't see the protein powder, the amount of protein in the tube is still very precise.

To learn more about how to properly dissolve the lyophilized recombinant protein, please visit Lyophilization FAQs.

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