Recombinant BirA protein, His-Tag
Expressed In
E. coli
Protein Species
E. coli
Cat No : 31517
Validation Data Gallery
Product Information
| Expressed In | E. coli |
| Protein Species | E. coli |
Contents
Full length recombinant BirA with His-Tag was expressed in E. coli cells and is provided in 25 mM Tris pH 8.0, 150 mM NaCl, 5% glycerol.
Background
BirA (bifunctional biotin-[acetylCoA carboxylase] holoenzyme synthetase/ DNA-binding transcriptional repressor, bio-5’-AMP-binding) is a bifunctional protein that exhibits biotin ligase activity and also acts as the DNA binding transcriptional repressor of the biotin operon. Biotinyl-5’-AMP is the co-repressor and is also synthesized by BirA.
Application Notes
Recombinant BirA is suitable for use in a variety of labeling applications and conditions. Reaction Conditions The amount of BirA required per reaction is dependent on the molecular weight of the target protein that contains the Biotinylation tag. In general, per 10 nmol of target substrate to be biotinylated, 2.5 ug BirA is suitable for labeling in a 40 uM reaction. An example reaction is shown below for labeling 100 ug of a 150 kDa antibody (0.67 nmol) at 1 mg/ml. In this case, although the concentration of the substrate is less than 40 uM, efficient labeling can be achieved in a range of 2-8 uM using as little as 0.3 ug of BirA. Example reaction for labeling 150 kDa antibody with an avidin tag: 100 ul antibody (1 mg/ml) 20 ul 0.5M Bicine pH 8.3 20 ul 10X Reaction Buffer (100 mM ATP, 100 mM MgOAc, 500 uM d-biotin) 0.5 ug (1.5 mg/mL BirA) 59.5 ul ddH20 —————————————————————————————— Total: 200 ul Incubate at 30 degrees for 2 hrs. Room temperature reactions are possible if the molarity of the substrate is sufficiently high. Increasing the concentration of BirA enzyme can also be employed to accelerate the reaction.
Protein Details
Recombinant BirA (NP_418404.1) with His-Tag was expressed in E. coli cells and contains an N-terminal 6xHis Tag with an observed molecular weight of 38 kDa. The recombinant protein is >90% pure by SDS-PAGE.
Storage
Recombinant proteins in solution are temperature sensitive and must be stored at -80°C to prevent degradation. Avoid repeated freeze/thaw cycles and keep on ice when not in storage.
Guarantee
This product is guaranteed for 6 months from date of receipt.
This product is for research use only and is not for use in diagnostic procedures.