Recombinant Human CTLA4 protein, C-His Tag

Product Description

Cat

IMP-255

Official Symbol

CTLA4

Product Overview

Recombinant Human CTLA4 protein(AA Ala 37-Phe 162)(Accession # NP_005205.2) is expressed from human 293 cells (HEK293). This protein carries a polyhistidine tag at the C-terminus.

Expression System

HEK293

Species

Human

Tag

C-His Tag

Form

Lyophilized from sterile PBS, pH7.4, 10% trehalose.

Molecular Mass

This protein carries a polyhistidine tag at the C-terminus. The protein has a calculated MW of 15.4 kDa. The protein migrates as 25-30 kDa under reducing (R) condition (SDS-PAGE) due to different extent glycosylation.

Protein length

Ala 37-Phe 162

Endotoxin

Less than 1.0 EU per ug by the LAL method.

Purity

>95% as determined by SDS-PAGE.

Storage

For long term storage, the product should be stored at lyophilized state at -20°C or lower. Please avoid repeated freeze-thaw cycles. This product is stable after storage at: -20°C to -70°C for 12 months in lyophilized state; -70°C for 3 months under sterile conditions after reconstitution.

Reconstitution

It is recommended that sterile water be added to the vial to prepare a stock solution of 0.2 mg/ml. Centrifuge the vial at 4ºC before opening to recover the entire contents.

SDS-PAGE

Human CTLA-4, His Tag on SDS-PAGE under reducing (R) condition. The gel was stained overnight with Coomassie Blue. The purity of the protein is greater than 95%.

Bioactivity-ELISA 1

Immobilized Human B7-1, Fc Tag (HPLC-verified) at 2 ug/mL (100 uL/well) can bind Human CTLA-4, His Tag with a linear range of 0.2-4 ng/mL.

Bioactivity-ELISA 2

Immobilized Human B7-2, Fc Tag at 2 ug/mL (100 uL/well) can bind Human CTLA-4, His Tag with a linear range of 1-6.4 ng/mL.

Bioactivity-SPR 1

Yervoy (Ipilimumab, Human IgG1) captured on CM5 chip via anti-human IgG Fc antibodies surface, can bind Human CTLA-4, His Tag with an affinity constant of 25.7 nM as determined in a SPR assay (Biacore T200).

Data Sheet MSDS

Datasheet MSDS

For research or industrial raw materials, not for personal medical use!

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