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MedKoo Cat#: 563968 | Name: Qstatin
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Description:

WARNING: This product is for research use only, not for human or veterinary use.

Qstatin is a selective inhibitor of quorum sensing (QS) in vibrio species and inhibits SmcR function.

Chemical Structure

Qstatin
Qstatin
CAS#902688-24-8

Theoretical Analysis

MedKoo Cat#: 563968

Name: Qstatin

CAS#: 902688-24-8

Chemical Formula: C7H5BrN2O2S2

Exact Mass: 291.8976

Molecular Weight: 293.15

Elemental Analysis: C, 28.68; H, 1.72; Br, 27.26; N, 9.56; O, 10.92; S, 21.87

Price and Availability

Size Price Availability Quantity
25mg USD 150.00 Ready to ship
50mg USD 250.00 Ready to ship
100mg USD 450.00 Ready to ship
200mg USD 750.00 Ready to ship
500mg USD 1,650.00 Ready to ship
1g USD 2,950.00 Ready to ship
2g USD 5,250.00 Ready to ship
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No Data
Synonym
Qstatin; Q-statin; Q statin
IUPAC/Chemical Name
1-(5-Bromothiophene-2-sulfonyl)-1H-pyrazole
InChi Key
MLRBBGFHILYDBK-UHFFFAOYSA-N
InChi Code
InChI=1S/C7H5BrN2O2S2/c8-6-2-3-7(13-6)14(11,12)10-5-1-4-9-10/h1-5H
SMILES Code
O=S(N1N=CC=C1)(C2=CC=C(Br)S2)=O
Appearance
Solid powder
Purity
>98% (or refer to the Certificate of Analysis)
Shipping Condition
Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.
Storage Condition
Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).
Solubility
Soluble in DMSO
Shelf Life
>3 years if stored properly
Drug Formulation
This drug may be formulated in DMSO
Stock Solution Storage
0 - 4 C for short term (days to weeks), or -20 C for long term (months).
HS Tariff Code
2934.99.03.00
More Info
Biological target:
QStatin is a potent and selective inhibitor of SmcR (V. harveyi LuxR homologue) with an EC50 of 208.9 nM, binding tightly to SmcR and changes the flexibility of the protein, thereby altering its transcription regulatory activity.
In vitro activity:
To examine whether QStatin affects the DNA-binding activity of SmcR, an electrophoretic mobility shift assay (EMSA) with PvvpE DNA was performed. Although SmcR binding to the DNA was reduced specifically by QStatin in a dose-dependent manner, the interaction was not completely abolished. The enthalpic (ΔH) and entropic (TΔS) components of the free binding energy of SmcR-DNA interaction were markedly changed by QStatin, indicating that QStatin affects the characteristics of the interaction between SmcR and PvvpE DNA. Similarly, SmcR interactions with the promoter DNAs of the flhF (PflhF) and VVMO6_03194 (PVVMO6_03194) genes, both of which are directly repressed by SmcR (37), were affected by QStatin. In these cases, the effect of QStatin was more noticeable, as the compound decreased the binding affinities of SmcR for the DNAs about 5-fold (for PflhF) or 8-fold (for PVVMO6_03194). Reference: mBio. 2018 Jan-Feb; 9(1): e02262-17. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5790914/
In vivo activity:
It was examined whether QStatin (20 μM) affects the expression of SmcR regulon in vivo. Both quantitative reverse transcription-PCR (qRT-PCR) and RNA sequencing analyses revealed that QStatin-treated WT V. vulinificus (WT+QStatin) and DMSO-treated ΔsmcR mutant V. vulinificus (ΔsmcR+DMSO) had expression profiles similar to those seen with the SmcR regulon (Fig. 5a and andb;b; see also Fig. S4), indicating that QStatin switches SmcR to a dysfunctional state and globally affects the expression of the SmcR regulon in vivo. Also, QStatin does not seem to inhibit transcriptional regulators other than SmcR, because gene expression profiles in the ΔsmcR mutant were not affected by QStatin treatment (Fig. 5b); thus, the ΔsmcR+QStatin sample clustered with the ΔsmcR+DMSO and WT+QStatin samples in a principal-component analysis (Fig. 5c). Taken together, these transcriptome-level in vivo analyses further indicate that QStatin affects the expression of the whole SmcR regulon by directly and selectively inhibiting SmcR. Reference: mBio. 2018 Jan-Feb; 9(1): e02262-17. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5790914/
Solvent mg/mL mM
Solubility
DMSO 83.3 284.25
Note: There can be variations in solubility for the same chemical from different vendors or different batches from the same vendor. The following factors can affect the solubility of the same chemical: solvent used for crystallization, residual solvent content, polymorphism, salt versus free form, degree of hydration, solvent temperature. Please use the solubility data as a reference only. Warming and sonication will facilitate dissolving. Still have questions? Please contact our Technical Support scientists.

Preparing Stock Solutions

The following data is based on the product molecular weight 293.15 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL
Formulation protocol:
1. Kim BS, Jang SY, Bang YJ, Hwang J, Koo Y, Jang KK, Lim D, Kim MH, Choi SH. QStatin, a Selective Inhibitor of Quorum Sensing in Vibrio Species. mBio. 2018 Jan 30;9(1):e02262-17. doi: 10.1128/mBio.02262-17. PMID: 29382732; PMCID: PMC5790914.
In vitro protocol:
1. Kim BS, Jang SY, Bang YJ, Hwang J, Koo Y, Jang KK, Lim D, Kim MH, Choi SH. QStatin, a Selective Inhibitor of Quorum Sensing in Vibrio Species. mBio. 2018 Jan 30;9(1):e02262-17. doi: 10.1128/mBio.02262-17. PMID: 29382732; PMCID: PMC5790914.
In vivo protocol:
1. Kim BS, Jang SY, Bang YJ, Hwang J, Koo Y, Jang KK, Lim D, Kim MH, Choi SH. QStatin, a Selective Inhibitor of Quorum Sensing in Vibrio Species. mBio. 2018 Jan 30;9(1):e02262-17. doi: 10.1128/mBio.02262-17. PMID: 29382732; PMCID: PMC5790914.
1: Kim BS, Jang SY, Bang YJ, Hwang J, Koo Y, Jang KK, Lim D, Kim MH, Choi SH. QStatin, a Selective Inhibitor of Quorum Sensing in Vibrio Species. MBio. 2018 Jan 30;9(1). pii: e02262-17. doi: 10.1128/mBio.02262-17. PubMed PMID: 29382732; PubMed Central PMCID: PMC5790914. 2: Sen H, Choudhury GB, Pawar G, Sharma Y, Bhalerao SE, Chaudhari VD, Datta S, Raychaudhuri S. Diversity in the ligand binding pocket of HapR attributes to its uniqueness towards several inhibitors with respect to other homologues - A structural and molecular perspective. Int J Biol Macromol. 2023 Apr 1;233:123495. doi: 10.1016/j.ijbiomac.2023.123495. Epub 2023 Feb 2. PMID: 36739058. 3: Collins GS, Altman DG. Predicting the adverse risk of statin treatment: an independent and external validation of Qstatin risk scores in the UK. Heart. 2012 Jul;98(14):1091-7. doi: 10.1136/heartjnl-2012-302014. Epub 2012 Jun 11. PMID: 22689714.