5.00653

Nef Hck Activation Inhibitor, B9

• Synonym(s): Nef Hck Activation Inhibitor, B9, Nef Dimerization Blocker, ( E)-4-((3-Chlorophenyl)diazenyl)-5-hydroxy-3-(4-nitrophenyl)-1H-pyrazole-1-carbothioamide, Nef Dimerization Blocker, (E)-4-((3-Chlorophenyl)diazenyl)-5-hydroxy-3-(4-nitrophenyl)-1H-pyrazole-1-carbothioamide
• Empirical Formula (Hill Notation): C₁₆H₁₁ClN₆O₃S
• CAS Number: 1596216-24-8
• Molecular Weight: 402.81
• UNSPSC Code: 51111800
• PubChem Substance ID: 4553981
• NACRES: NA.77

Properties

• assay: ≥98% (HPLC)
• Quality Level: 100
• form: powder
• manufacturer/tradename: Calbiochem^®
• storage condition: OK to freeze; protect from light
• color: orange
• solubility: DMSO: 2.5 mg/mL
• storage temp.: 2-8°C
• SMILES string: C1=CC(=CC(=C1)Cl)N=NC2=C(NN(C2=O)C(=S)N)C3=CC=C(C=C3)[N+](=O)[O-]

Description

General description

A cell-permeable diphenylpyrazolo compound that disrupts HIV accessary protein Nef dimerization (IC₅₀ = 3 µM in HEK293T cells) and prevents Nef-mediated Src family kinase Hck activation (IC₅₀ = 2.8 µM) without directly affecting the catalytic activity of c-Src, Hck, Lck, or Lyn. Shown to suppress HIV and SIV viral replication (IC₅₀/strain/culture = 1 µM/SIV ΔB670/CEM-174 and <0.3 µM/HIV-1 NL4-3/CEM-T4) and infectivity, being ineffective against the replication of Nef-defective HIV-1 mutant. Molecular docking and in vitro binding studies reveal a high-affinity B9-targeting site formed at the Nef dimerization interface and a low-affinity binding site on each Nef monomer at the dimer interface periphery.

A cell-permeable diphenylpyrazolo compound that is shown to disrupt HIV accessary protein Nef dimerization (IC₅₀ = 3 µM in HEK293T cells) and prevent Nef-mediated Src family kinase (SFK) Hck activation (IC₅₀ = 2.8 µM) without directly affecting the catalytic activity of c-Src, Hck, Lck, or Lyn (IC₅₀ >20 µM). Shown to effectively suppress HIV and SIV viral replication (IC₅₀<0.3 µM in 9 d HIV-1 NL4-3-infected CEM-T4 cultures; IC₅₀ = 1 µM in 5 d SIV ΔB670-infected CEM-174 cultures) and infectivity (45% and 50% inhibition against HIV-1 NL4-3 and SIV ΔB670, respectively, following 48 h 3 µM B9 treatment in TZM-bl reporter cells) in a Nef-dependent manner, being ineffective against the replication of Nef-defective HIV-1 mutant. Molecular docking studies predict a high-affinity B9-targeting site formed at the Nef dimerization interface and a low-affinity B9-binding site on each Nef monomer at the dimer interface periphery, with Asn126 contributing to both modes of binding. Consistently, in vitro binding studies reveal two B9 K_D values of 1.72 nM and 860 nM toward full-length HIV-1 Nef and a complete loss of B9 binding toward Nef N126A/L/Q mutants.

Biochem/physiol Actions

Cell permeable: yes

Primary Target
Nef

Reversible: yes

Packaging

Packaged under inert gas

Warning

Toxicity: Standard Handling (A)

Reconstitution

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

Other Notes

Emert-Sedlak, L.A., et al. 2013. Chem. Biol.20, 82.

Legal Information

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

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 2
• flash_point_f: Not applicable
• flash_point_c: Not applicable