Recombinant Human P4HB Protein, CF

Catalog #: 4236-DI Datasheet / COA / SDS

Catalog #	Availability	Size / Price	Qty
4236-DI-050

R&D Systems Recombinant Proteins and Enzymes

1 Image

All Protein Disulfide Isomerase/P4HB Proteins and Enzymes

Product Details

Reviews

Summary Product Datasheets Carrier Free Data Images Reconstitution Calculator Background Related Research Areas

Recombinant Human P4HB Protein, CF Summary

Product Specifications

Purity

>80%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.

Endotoxin Level

<1.0 EU per 1 μg of the protein by the LAL method.

Activity

Measured by its ability to promote aggregation of insulin in the presence of DTT. The specific activity is >7.5 A₆₅₀/cm/min/mg, as measured under the described conditions.

Source

Chinese Hamster Ovary cell line, CHO-derived human Protein Disulfide Isomerase/P4HB protein
Asp18-Lys505, with a C-terminal 10-His tag

Accession #

P07237

N-terminal Sequence
Analysis

Asp18

Predicted Molecular Mass

56 kDa

SDS-PAGE

60 kDa, reducing conditions

Product Datasheets

4236-DI

Product Datasheet

COA

SDS

Carrier Free

What does CF mean?

CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our recombinant proteins. Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant protein to be stored at a more dilute concentration. The carrier free version does not contain BSA.

What formulation is right for me?

In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or as an ELISA standard. In contrast, the carrier free protein is recommended for applications, in which the presence of BSA could interfere.

4236-DI

Formulation	Supplied as a 0.2 μm filtered solution in Tris, NaCl and Glycerol.
Shipping	The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage:	Use a manual defrost freezer and avoid repeated freeze-thaw cycles. 6 months from date of receipt, -20 to -70 °C as supplied. 3 months, -20 to -70 °C under sterile conditions after opening.

Assay Procedure

Materials

Buffer A: 100 mM NaH₂PO₄, 3 mM DTT, pH 7.0
Buffer B: 100 mM NaH₂PO₄, 3 mM EDTA, pH 7.0
Recombinant Human Protein Disulfide Isomerase/P4HB (rhP4HB) (Catalog # 4236-DI)
Insulin (Sigma, Catalog # I-5500), 10 mg/mL solution in 50 mM Tris, pH 7.5 (solution will be cloudy)
96-well Clear Plate (Costar, Catalog # 92592)
Plate Reader (Model: SpectraMax Plus by Molecular Devices) or equivalent

Dilute insulin to 1.5 mg/mL in Buffer B.
Incubate diluted insulin for 10 minutes at room temperature (insulin will solubilize).
Dilute rhP4HB to 45 µg/mL in Buffer A.
Mix 100 µL of 45 µg/mL rhP4HB and 200 µL of 1.5 mg/mL insulin. Create a Substrate Blank with 100 µL Buffer A and 200 µL insulin.
Incubate at room temperature for 20 minutes.
Load in a clear 96-well plate 100 µL from each reaction vial in duplicate.
Read at 650 nm (absorbance) in kinetic mode for 5 minutes.
Calculate specific activity:

Specific Activity (Abs/cm/min/mg) =	Adjusted V_max* (Abs/min)**
	path corr.(cm)*** x amount of enzyme (mg)

     *Adjusted for Substrate Blank
     **Note: the output of many spectrophotometers in kinetic mode is in mOD.
     ***Using the pathlength correction of 0.32 cm

Per Well:

rhP4HB: 0.0015 mg
Insulin: 0.100 mg

Reconstitution Calculator

Background: Protein Disulfide Isomerase/P4HB

Protein Disulfide Isomerase, also known as prolyl 4‑hydroxylase subunit beta (P4HB), protocollagen hydroxylase, cellular thyroid hormone binding protein p55 and glutathione-insulin transhydrogenase (1-3) is an abundant multifunctional enzyme that belongs to the Protein Disulfide Isomerase family. It contains two thioredoxin domains that catalyze the formation, breakage and rearrangement of disulfide bonds. When present as a tetramer consisting of two alpha subunits and two beta subunits, this enzyme functions as a hydroxylase catalyzing the hydroxylation of prolyl residues in preprocollagen. P4HB has various additional functions (4-7). It binds thyroid hormone. It acts as a chaperone that inhibits aggregation of misfolded proteins. It plays a role in both the influx and efflux of S-nitrosothiol-bound nitric oxide. It is also a subunit of the microsomal triglyceride transfer protein complex.

References

Pihlajaniemi, T. et al. (1987) EMBO J. 6:643.
Cheng, S.Y. et al. (1987) J. Biol. Chem. 262:11221.
Morris, J. I. and Varandani, P. T. (1988) Biochim. Biophys. Acta 949:169.
Obata, T. et al. (1988) J. Biol. Chem. 263:782.
Gilbert, H. F. (1997) J. Biol. Chem. 272:29399.
Sliskovic, I. et al. (2005) J. Biol. Chem. 280:8733.
Wetterau, J. R. et al. (1990) J. Biol. Chem. 265:9800.

Long Name

Proline 4-Hydroxylase, Beta Polypeptide

Entrez Gene IDs

5034 (Human); 18453 (Mouse); 25506 (Rat)

Alternate Names

Cellular thyroid hormone-binding protein; collagen prolyl 4-hydroxylase beta; DSI; ERBA2L; GIT; glutathione-insulin transhydrogenase; P4HB; P4Hbeta; p55; PDI; PDIA1; PDIA1procollagen-proline, 2-oxoglutarate 4-dioxygenase (proline 4-hydroxylase), betapolypeptide (protein disulfide isomerase-associated 1); PDIEC 5.3.4.1; PHDB; PO4DB; PO4HB; procollagen-proline, 2-oxoglutarate 4-dioxygenase (proline 4-hydroxylase), betapolypeptide; PROHB; PROHBprocollagen-proline, 2-oxoglutarate 4-dioxygenase (proline 4-hydroxylase), betapolypeptide (protein disulfide isomerase; thyroid hormone binding protein p55); Prolyl 4-hydroxylase subunit beta; prolyl 4-hydroxylase, beta polypeptide; protein disulfide isomerase family A, member 1; protein disulfide isomerase/oxidoreductase; protein disulfide isomerase-associated 1; protein disulfide-isomerase; protocollagen hydroxylase; Thbp; thyroid hormone-binding protein p55