BIIB 021A novel inhibitor of Hsp90

BIIB 021 (CAS 848695-25-0)

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Synonym: CNF 2024
Application: A novel inhibitor of Hsp90
CAS Number: 848695-25-0
Molecular Weight: 318.76
Molecular Formula: C14H15ClN6O
* Refer to Certificate of Analysis for lot specific data (including water content).
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BIIB 021 binds in the ATP-binding pocket of Hsp90, interferes with Hsp90 chaperone function, and results in client protein degradation and tumor growth inhibition. BIIB 021 inhibits tumor cell (BT474, MCF-7, N87, HT29, H1650, H1299, H69 and H82) proliferation (IC50 of 0.06-0.31 μM). BIIB 021 induces the degradation of Hsp90 client proteins including HER-2, Akt, and Raf-1 and up-regulated expression of the heat shock proteins Hsp70 and Hsp27. BIIB 021 inhibits Hodgkin's lymphoma cells (KM-H2, L428, L540, L540cy, L591, L1236 and DEV) (IC50 of 0.24-0.8 μM). BIIB 021 shows low activity in lymphocytes from healthy individuals. BIIB 021 inhibits the constitutive activity of NF-κB despite defective IκB. BIIB 021 induces the expression of ligands for the activating NK cell receptor NKG2D on Hodgkin's lymphoma cells resulting in an increased susceptibility to NK cell–mediated killing. BIIB 021 enhanced the in vitro radiosensitivity of HNSCCA cell lines (UM11B and JHU12) with a corresponding reduction in the expression of key radioresponsive proteins, increased apoptotic cells and enhance G2 arrest. BIIB 021 is considerably more active than 17-AAG against adrenocortical carcinoma H295R, both in vitro and in vivo. The cytotoxic activity of BIIB 021 is not influenced by loss of NQO1 or Bcl-2 overexpression, molecular lesions that do not prevent client loss but are nonetheless associated with reduced cell killing by 17-AAG. BIIB 021 is also active in 17-AAG resistant cell lines (NIH-H69, MES SA Dx5, NCI-ADR-RES, Nalm6 and etc.).


PMID: 19372565 PMID: 19671844 PMID: 19662650 PMID: 19676042

Physical State :
Solubility :
Soluble in DMSO (64 mg/ml at 25 °C), ethanol (2 mg/ml at 25 °C), water (<1 mg/ml at 25 °C), and 30% propylene glycol, 5% Tween 80, 65% D5W (30 mg/ml at 25 °C).
Storage :
Store at -20° C
Melting Point :
219.35 °C (Predicted)
Boiling Point :
~588.5 °C at 760 mmHg (Predicted)
Density :
~1.5 g/cm3 (Predicted)
Refractive Index :
n20D 1.71 (Predicted)
IC50 :
HSP 90α: IC50 = 5.1 nM (human); HSP 90β: IC50 = 7 nM (human); Hsp90: IC50 = 20 nM (MCF7 cell lysates); HSP 75: IC50 = 90 nM (human); BT-474: IC50 = 100 nM (human)
Ki Data :
HSP 90β: Ki= 1.7 nM (human); HSP 90α: Ki= 1.7 nM (human); HSP 75: Ki= 62 nM (human); Endoplasmin: Ki= 176 nM (human)
pK Values :
pKb: 6.07 (Predicted)
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
PubChem CID :
MDL Number :

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Certificate of Analysis

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