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Merck

412512

4μ8C

≥95% (HPLC), selective inhibitor of IRE1α, powder

Synonym(s):

IRE1 Inhibitor III, 4μ8C, 8-Formyl-7-hydroxy-4-methylcoumarin, 7-Hydroxy-4-methyl-2-oxo-2H-chromene-8-carbaldehyde, ER-to-Nucleus Signaling 1 Inhibitor III, Inositol-Reguiring Protein 1 Inhibitor III

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About This Item

Empirical Formula (Hill Notation):
C11H8O4
CAS Number:
14003-96-4
Molecular Weight:
204.18
UNSPSC Code:
12352200
NACRES:
NA.28
MDL number:
MFCD12027255
Assay:
≥95% (HPLC)
Form:
powder
Quality level:
100
Storage condition:
OK to freeze, protect from light

Key Documents

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Product Name

IRE1 Inhibitor III, 4μ8C, IRE1 Inhibitor III, CAS 14003-96-4, is a cell-permeable. Covalent inhibitor of IRE1 RNase activity (IC50 = 550 and 45 nM, respectively, with 0 & 16 min preincubation in RNA cleavage assays).

SMILES string

O=C(C=C1C)OC2=C1C=CC(O)=C2C=O

InChI key

RTHHSXOVIJWFQP-UHFFFAOYSA-N

InChI

1S/C11H8O4/c1-6-4-10(14)15-11-7(6)2-3-9(13)8(11)5-12/h2-5,13H,1H3

assay

≥95% (HPLC)

form

powder

manufacturer/tradename

Calbiochem®

storage condition

OK to freeze, protect from light

color

yellow

solubility

DMSO: 25 mg/mL

shipped in

ambient

storage temp.

2-8°C

Quality Level

100

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General description

A cell-permeable coumarin o-hydroxyaldehyde compound that inhibits IRE1 RNase activity in a time- and dose-dependent manner (IC50 = 550, 230, 180, 100, and 45 nM, respectively, with 0, 2, 4, 8, 16, min drug preincubation in FRET-based RNA cleavage assays) by covalently targeting IRE1 Lys907 via Schiff base formation, effectively preventing ER stress-induced site-specific mRNA splicing as well as RIDD (Regulated IRE1-Dependent Degradation) mRNA degradation (IC50 = 6.9 and 4.1 µM, respectively, against Xbp1 splicing and Scara3 degradation) in MEF cultures following Tunicamycin (Cat. No. 654380) treatment. Also demonstrated to inhibit ER capacity expansion (Effective conc. 32 µM) and amylase secretion (IC50<2 µM) upon stress induction by Dexamethasone (Cat. No. 265005) treatment in rat AR42J tumoral acinar pancreatic cells. Structural analysis reveals that the reduced water accessibility to Lys907 in IRE1 native conformation accounts for the unusual stability of Lys907 Schiff base formation and forms the basis of selective IRE1 RNase inhibition by 4μ8C and STF083010 (Cat. No. 412510). Although 4μ8C, but not STF083010, is also shown to inhibit IRE1 autophosphorylation by Schiff base formation with IRE1 Lys599 in the absence of ADP, cellular nucleotide prevents 4μ8C from targeting IRE1 Lys599 and inhibiting IRE1 kinase activity intracellularly.
A cell-permeable coumarin o-hydroxyaldehyde that inhibits IRE1 RNase activity in a time- and dose-dependent manner (IC50 = 550 and 45 nM, respectively, with 0 and 16 min drug preincubation in RNA cleavage assays) by covalently targeting IRE1 Lys907 via Schiff base formation, effectively preventing ER stress-induced site-specific mRNA splicing as well as RIDD (Regulated IRE1-Dependent Degradation) mRNA degradation (IC50 = 6.9 and 4.1 µM, respectively, against Xbp1 splicing and Scara3 degradation) in MEF cultures following Tunicamycin (Cat. No. 654380) treatment. Comparing to STF083010 (Cat. No. 412510), 4μ8C is also shown to inhibit IRE1 autophosphorylation in cell-free assays via Schiff base formation with IRE1 Lys599 in the absence of ADP, however cellular nucleotide prevents 4μ8C from targeting IRE1 Lys599 intracellularly.

Biochem/physiol Actions

Cell permeable: yes
Primary Target
IRE1
Reversible: yes

Packaging

Packaged under inert gas

Preparation Note

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months.

Other Notes

Cross, B.C.S., et al. 2012. Proc. Natl. acad. Sci. USA109, E869.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Disclaimer

Toxicity: Standard Handling (A)

Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

412512-MG: + 412512-25MG:

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Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Aparajita Madhavan et al.
Nature communications, 13(1), 608-608 (2022-02-03)
In obesity, signaling through the IRE1 arm of the unfolded protein response exerts both protective and harmful effects. Overexpression of the IRE1-regulated transcription factor XBP1s in liver or fat protects against obesity-linked metabolic deterioration. However, hyperactivation of IRE1 engages regulated IRE1-dependent
Rohit B Sharma et al.
The Journal of biological chemistry, 295(41), 14164-14177 (2020-08-14)
Success or failure of pancreatic beta cell adaptation to ER stress is a determinant of diabetes susceptibility. The ATF6 and IRE1/XBP1 pathways are separate ER stress-response effectors important to beta cell health and function. ATF6α. and XBP1 direct overlapping transcriptional
Rachel E Carlisle et al.
Cell death & disease, 12(10), 921-921 (2021-10-10)
Chronic kidney disease (CKD) is characterized by the gradual loss of renal function and is a major public health concern. Risk factors for CKD include hypertension and proteinuria, both of which are associated with endoplasmic reticulum (ER) stress. ER stress-induced
José P Guirao-Abad et al.
mSphere, 5(5) (2020-10-23)
The unfolded protein response (UPR) is a signaling network that maintains homeostasis of the endoplasmic reticulum (ER). In the human-pathogenic fungus Aspergillus fumigatus, the UPR is initiated by activation of an endoribonuclease (RNase) domain in the ER transmembrane stress sensor
Michael J Grey et al.
The Journal of clinical investigation, 132(17) (2022-06-22)
Epithelial cells lining mucosal surfaces of the gastrointestinal and respiratory tracts uniquely express ERN2/IRE1β, a paralogue of the most evolutionarily conserved endoplasmic reticulum stress sensor, ERN1/IRE1α. How ERN2 functions at the host-environment interface and why a second paralogue evolved remain
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Global Trade Item Number

SKUGTIN
412512-25MGCN04055977188189

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