Product Details

Purity

>95% as determined by SDS-PAGE.

Endotoxin

Less than 1.0 EU/μg as determined by LAL method.

Activity

Thiol Protein Reductase Activity is 0.001 Δ650nm/ min-2, determined by measuring the turbidityincrease at 650 nm due to insulin reduction.The activity is expressed as the ratio of the slope of a linear part of the turbidity curve to the lag time.

Target Names

P4HB

Uniprot No.

P07237

Research Area

Signal Transduction

Alternative Names

Cellular thyroid hormone binding protein; Cellular thyroid hormone-binding protein; Collagen prolyl 4 hydroxylase beta; Disulphide Isomerase; DSI; EC 5.3.4.1; Endoplasmic reticulum resident protein 59; ER protein 59; ERBA2L; ERp59; GIT; Gltathione insulin transhydrogenase; Glutathione insulin transhydrogenase; P4HB; P4Hbeta; p55; PDI; PDIA1; PDIA1_HUMAN; PDIR; PHDB; PO4DB; PO4HB; Procollagen proline 2 oxoglutarate 4 dioxygenase (proline 4 hydroxylase) beta polypeptide (protein disulfide isomerase associated 1); Procollagen proline 2 oxoglutarate 4 dioxygenase beta subunit; PROHB; Prolyl 4 hydroxylase beta polypeptide; Prolyl 4 hydroxylase beta subunit; Prolyl 4 hydroxylase subunit beta; Prolyl 4-hydroxylase subunit beta; Protein disulfide isomerase associated 1; Protein disulfide isomerase, family A, member 1; Protein disulfide isomerase/oxidoreductase; Protein disulfide-isomerase; Protocollagen hydroxylase; Thbp; Thyroid hormone binding protein p55 ; Thyroid hormone binding protein p55 cellular; V erb a avian erythroblastic leukemia viral oncogene homolog 2 like

Species

Homo sapiens (Human)

Source

E.Coli

Expression Region

19-508aa

Complete Sequence

MRGSGSHHHHHH+ APEEEDHVLVLRKSNFAEALAAHKYLLVEFYAPWCGHCKALAPEYAKAAGKLKAEGSEIRLAKVDATEESDLAQQYGVRGYPTIKFFRNGDTASPKEYTAGREADDIVNWLKKRTGPAATTLPDGAAAESLVESSEVAVIGFFKDVESDSAKQFLQAAEAIDDIPFGITSNSDVFSKYQLDKDGVVLFKKFDEGRNNFEGEVTKENLLDFIKHNQLPLVIEFTEQTAPKIFGGEIKTHILLFLPKSVSDYDGKLSNFKTAAESFKGKILFIFIDSDHTDNQRILEFFGLKKEECPAVRLITLEEEMTKYKPESEELTAERITEFCHRFLEGKIKPHLMSQELPEDWDKQPVKVLVGKNFEDVAFDEKKNVFVEFYAPWCGHCKQLAPIWDKLGETYKDHENIVIAKMDSTANEVEAVKVHSFPTLKFFPASADRTVIDYNGERTLDGFKKFLESGGQDGAGDDDDLEDLEEAEEPDMEEDDDQKAVKDEL

Mol. Weight

56.6 kDa

Protein Length

Partial

Tag Info

N-terminal 6xHis-tagged

Form

Liquid or Lyophilized powder

Buffer

0.2 μm filtered PBS, pH 7.0 ,lyophilized

Troubleshooting and FAQs

Protein FAQs

Storage Condition

Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. Avoid repeated freeze-thaw cycles.

Shelf Life

The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.

Lead Time

5-10 business days

Datasheet & COA

Please contact us to get it.

Description

Protein disulfide-isomerase (PDI/P4HB) serves as a master regulator of oxidative protein folding, making validated catalytic activity essential for meaningful in vitro studies. This recombinant human P4HB (residues 19–508) demonstrates confirmed thiol protein reductase activity of 0.001 Δ650nm/min⁻², quantified via insulin turbidity assay at 650 nm, providing a reliable basis for enzymatic activity assays, kinetic parameter analysis (Km, Vmax, kcat), and inhibitor screening with IC50 determination. The N-terminal 6xHis tag positions away from the catalytic thioredoxin-like domains, preserving active-site accessibility for substrate specificity profiling and drug candidate evaluation studies. Purity exceeding 95% by SDS-PAGE combined with endotoxin levels below 1.0 EU/μg satisfies the criteria typically required for accurate kinetic measurements, positive controls in enzyme-linked assays, and structural studies including crystallography.

Target Background

Function

This multifunctional protein catalyzes the formation, breakage and rearrangement of disulfide bonds. At the cell surface, seems to act as a reductase that cleaves disulfide bonds of proteins attached to the cell. May therefore cause structural modifications of exofacial proteins. Inside the cell, seems to form/rearrange disulfide bonds of nascent proteins. At high concentrations, functions as a chaperone that inhibits aggregation of misfolded proteins. At low concentrations, facilitates aggregation (anti-chaperone activity). May be involved with other chaperones in the structural modification of the TG precursor in hormone biogenesis. Also acts a structural subunit of various enzymes such as prolyl 4-hydroxylase and microsomal triacylglycerol transfer protein MTTP. Receptor for LGALS9; the interaction retains P4HB at the cell surface of Th2 T helper cells, increasing disulfide reductase activity at the plasma membrane, altering the plasma membrane redox state and enhancing cell migration.

Gene References into Functions

Peroxynitrite preferentially oxidizes the dithiol redox motifs of protein-disulfide isomerase. PMID: 29191937
Overexpression of HIF-1alpha and P4HB is associated with poor prognosis in patients with gastric cancer. PMID: 29904245
Study demonstrated that the expression of P4HB is frequently upregulated at the mRNA and protein levels in diffuse gliomas. Its high expression was significantly correlated with high Ki-67, more TP53 mutations and poor survival outcome. These findings imply that high expression of P4HB plays an important role in diffuse glioma progression. PMID: 29207176
identify a potent and selective PDIA1 inhibitor, KSC-34, with 30-fold selectivity for the a site over the a' site. KSC-34 displays time-dependent inhibition of PDIA1 reductase activity in vitro with a kinact/ KI of 9.66 x 10(3) M(-1) s(-1) and is selective for PDIA1 over other members of the PDI family, and other cellular cysteine-containing proteins. PMID: 29521097
P4HB promotes hepatocellular carcinoma progression by down-regulating GRP78 expression and subsequently promoting epithelial-to-mesenchymal transition. PMID: 28052026
analysis of antiplatelet activity of CxxC through binding to Cys400 in the PDI a0 domain, which can be further exploited as a model for sitedriven antithrombotic agent development PMID: 28109047
Current findings indicate that thiol isomerase-mediated disulfide bond modification in receptors and plasma proteins is an important layer of control of thrombosis and vascular function more generally. PMID: 28598864
DIA1 was robustly secreted by physiological levels of arterial laminar shear in endothelial cells and supported alpha 5 integrin thiol oxidation. PMID: 28034831
Kinetic-based trapping by intervening sequence variants of the active sites of protein-disulfide isomerase identifies platelet protein substrates. PMID: 28364042
a mechanism of dual Ero1alpha regulation by dynamic redox interactions between PDI and the two Ero1alpha flexible loops that harbor the regulatory cysteines. PMID: 27703014
analysis of how redox affects human protein disulfide isomerase regulate binding affinity of 17 beta-estradiol PMID: 28257787
These findings improve our understanding of PDI-protected aggregation of wild-type alpha-Syn and its H50Q familial mutant. PMID: 27142583
Association of P4HB polymorphisms with sporadic amyotrophic lateral sclerosis susceptibility in the Chinese Han population. PMID: 26000911
the effect of the endoplasmic reticulum chaperone protein disulfide isomerase (PDI) on beta-cell dysfunction, was examined. PMID: 26607804
Amyotrophic lateral sclerosis-linked PDIA1 mutations disrupt motor neuron connectivity. PMID: 26869642
direct binding of PDIA1 to VWF, is reported. PMID: 26670633
Selective sequestration of PDI1A in a calcium depletion-mediated complex with the abundant chaperone calreticulin attenuates the effective concentration of this major lumenal thiol oxidant. PMID: 25575667
Cole-Carpenter syndrome is caused by a specific de novo mutation in P4HB that impairs the disulfide isomerase activity of protein disulfide isomerase. PMID: 25683117
PDI has a role as a competent regulator and a specific substrate of Ero1alpha govern efficient and faithful oxidative protein folding and maintain the ER redox homeostasis PMID: 25258311
The crystal structure of the dimeric form of noncatalytic bb' domains of human PDIA1 determined to 2.3 A resolution revealed that the formation of dimers occludes the substrate binding site. PMID: 24549644
Elevated P4HB expression is associated with temozolomide resistance in malignant glioma. PMID: 23444257
). The results suggest that P4HB is a modifier gene inamyotrophic lateral sclerosis susceptibility and may represent a potential therapeutic target for amyotrophic lateral sclerosis . PMID: 23337974
A mixed disulfide complex was formed with the catalytic domain A1 from human PDI consistent with a model for cotranslational oxidative protein folding wherein PDI acts as a placeholder that is relieved by the pairing of cysteines caused by substrate folding. PMID: 23141538
TPM4, PDIA and SRC8 were also localized to the trophoblast cells, further highlighting the importance of these cytoskeletal remodelling proteins in early pregnancy PMID: 21373848
these data revealed a redox-regulated chaperone function of PDI in delivering antigenic peptides from TAP to MHC-I. PMID: 21299467
Functional PDI is rapidly secreted from human umbilical vein endothelial cells in culture upon activation with thrombin or after laser-induced stimulation. PMID: 20668226
domain c is required for the stabilization and maintenance of the chaperone function of PDI under extreme conditions PMID: 15358778
data indicate that binding sites in three PDI domains, a, b', and a', contribute to efficient C-P4H tetramer assembly PMID: 15590633
PDI can be S-nitrosated and PDI-SNO can be denitrosated by PDI suggesting that this enzyme could be intimately involved in the transport of intracellular NO equivalents to the cell surface. PMID: 15611098
Data show that protein disulfide isomerase can switch its conformation from dimer to tetramer in its functions as a foldase. PMID: 15695804

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Involvement in disease

Cole-Carpenter syndrome 1 (CLCRP1)

Subcellular Location

Endoplasmic reticulum. Endoplasmic reticulum lumen. Melanosome. Cell membrane; Peripheral membrane protein.

Protein Families

Protein disulfide isomerase family

Database Links

HGNC: 8548

OMIM: 112240

KEGG: hsa:5034

STRING: 9606.ENSP00000327801

UniGene: Hs.464336

Code	CSB-AP000091HU
Abbreviation	Recombinant Human P4HB protein, partial (Active)
MSDS	MSDS Datasheet
Size	$516
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Recombinant Human Protein disulfide-isomerase protein (P4HB), partial (Active)

Product Details

Citations

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Target Background

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