Leptomycin B
- CAS No.
- 87081-35-4
- Chemical Name:
- Leptomycin B
- Synonyms
- Lepomycin B;Leprimycin B;LEPTOMYCIN B;antibioticci940;antibioticcl1957a;Leptomycin B solutio;Leptomycin B (CI 940;Leptomycin B (0.2mg/ml);LeptoMycin B 1% soluton;InSolution? Leptomycin B,
- CBNumber:
- CB9500811
- Molecular Formula:
- C33H48O6
- Molecular Weight:
- 540.73
- MDL Number:
- MFCD06795848
- MOL File:
- 87081-35-4.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Melting point | 41-44°, with prior softening (Hokanson) |
|---|---|
| alpha | D -24.5° (c = 0.70 in MeOH); D23 -157 ° (c = 0.7% in chloroform) |
| Boiling point | 725.8±60.0 °C(Predicted) |
| Density | 1.072±0.06 g/cm3(Predicted) |
| Flash point | 11°(52°F) |
| storage temp. | −20°C |
| solubility | Supplied in solution in ethanol (1 mg/ml). Further dilutions may be made with either ethanol or DMSO. |
| pka | 5.10±0.33(Predicted) |
| form | Liquid |
| color | White to off-white |
| Stability | Stable for 1 year from date of purchase as supplied. Solutions or dilutions in DMSO are not stable. Solutions should be made fresh and used within one working day. |
| InChIKey | YACHGFWEQXFSBS-XYERBDPFSA-N |
| SMILES | C(O)(=O)/C=C(\C)/C[C@H](C)[C@@H](O)[C@H](C)C(=O)[C@H](C)/C=C(\C)/C=C/C[C@@H](C)/C=C(/CC)\C=C\[C@@H]1OC(=O)C=C[C@@H]1C |
| FDA UNII | Y031I2N1EO |
| UNSPSC Code | 12352200 |
| NACRES | NA.77 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |    GHS02,GHS06,GHS08 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H225-H301+H311+H331-H370 | |||||||||
| Precautionary statements | P210-P280-P301+P310+P330-P302+P352+P312-P304+P340+P311 | |||||||||
| Hazard Codes | F,T | |||||||||
| Risk Statements | 23/25-36/38-39/23/24/25-23/24/25-11 | |||||||||
| Safety Statements | 7-16-24-33-45-36/37 | |||||||||
| RIDADR | UN 1230 3/PG 2 | |||||||||
| WGK Germany | 3 | |||||||||
| HazardClass | 3 | |||||||||
| HS Code | 29419090 | |||||||||
| Storage Class | 3 - Flammable liquids | |||||||||
| Hazard Classifications | Eye Irrit. 2 Flam. Liq. 2 |
|||||||||
| NFPA 704 |
|
Leptomycin B price More Price(58)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | L2913 | Leptomycin B solution from Streptomyces sp. ≥95% (HPLC), Supplied in methanol: water (7:3) | 87081-35-4 | 0.5μg | $63.6 | 2026-04-30 | Buy |
| Sigma-Aldrich | L2913 | Leptomycin B solution from Streptomyces sp. ≥95% (HPLC), Supplied in methanol: water (7:3) | 87081-35-4 | 2x0.5μg | $118 | 2026-04-30 | Buy |
| Sigma-Aldrich | L2913 | Leptomycin B solution from Streptomyces sp. ≥95% (HPLC), Supplied in methanol: water (7:3) | 87081-35-4 | 5x0.5μg | $259 | 2026-04-30 | Buy |
| Sigma-Aldrich | L2913 | Leptomycin B solution from Streptomyces sp. ≥95% (HPLC), Supplied in methanol: water (7:3) | 87081-35-4 | 10x0.5μg | $405 | 2026-04-30 | Buy |
| Sigma-Aldrich | L2913 | Leptomycin B solution from Streptomyces sp. ≥95% (HPLC), Supplied in methanol: water (7:3) | 87081-35-4 | 5μg | $439 | 2026-04-30 | Buy |
Leptomycin B Chemical Properties, Uses, Production
Description
Leptomycin B (87081-35-4) is an inhibitor of nuclear export of proteins. Acts via covalent binding to and inhibiting CRM1/exportin-1.1 Inhibits the nuclear export of the HIV regulatory protein Rev.2 Leptomycin B stabilizes p53 by blocking its nuclear export.3
Uses
Leptomycin B is the dominant and most studied member of the leptomycin class, isolated from selected Streptomyces strains. Leptomycin B is a nanomolar active and specific nuclear export inhibitor. Its target is CRM1/exportin1, a protein in the nuclear export sequence (NES). Proteins affected include c-Abl, cyclin B1, HIV-1 Rev, IκB, MPF, MAP/ERK, MDM2/p53, NF-κB/IκB7 and PKA. Leptomycin B inhibits export of many RNAs, e.g. COX-2 and c-FOS mRNA. Leptomycin B also shows antifungal and antibacterial and potent antitumour activities.
Uses
Biological tool for studying nuclear localization and protein trafficking in eukaryotic cells.
Uses
Potent, specific inhibitor of nuclear export signal (NES)-dependent protein export from the nucleus
Definition
ChEBI: A leptomycin having a (2E,10E,12E,16Z,18E)-double bond configuration as well as an ethyl substituent at position 17.
Biological Functions
Leptomycin B (LMB) is an unsaturated, branched-chain fatty acid that proved a potent tool in nuclear export studies. It was isolated from Streptomyces sp. strain ATS 1287. Until recently, LMB has been the only known small-molecule inhibitor of nuclear transport. The nuclear export inhibitor leptomycin B (LMB) prevents the export of proteins from the nucleus to the cytoplasm, protects p53 from Mdm2-mediated degradation, and potent inducer of p53 transcriptional activity. It is a specific inhibitor of the nuclear export of proteins containing leucine-rich nuclear export signal (NES). Supplementing sub-nanomolar concentrations of LMB to cultured cells caused inhibition of nuclear export of leucine-rich NES-bearing protein. Since its discovery as a potent inhibitor of nuclear export, a large number of shuttling proteins, performing a diverse range of cellular functions, are now known to accumulate in the nucleus.
General Description
Leptomycin B is an anti-fungal antibiotic, anti-tumor cytotoxin that inhibits CRM1-dependent, NES-dependent nucleo-cytoplasmic translocation (nuclear export inhibitor). NES containing proteins include HIV-1 REV; actin, c-Abl, cyclin B1, MDM2/p53, IB, MPF, PKA and MEK.
Biological Activity
Antifungal antibiotic that is an inhibitor of the nuclear export of proteins; acts by binding directly to and inhibiting CRM1/exportin-1. Inhibits the nuclear export of the HIV regulatory protein Rev and stabilizes p53. Antitumor in vitro and in vivo .
Biochem/physiol Actions
Leptomycin B is an unsaturated, branched-chain fatty acid, and is an important tool in the study of nuclear export. Leptomycin B is a specific inhibitor of proteins containing nuclear export signal. Leptomycin B inhibits nucleo-cytoplasmic translocation of molecules such as the HIV-1 Rev protein and Rev-dependent export of mRNA. The addition of very small amounts to fibroblasts causes accumulation of MEK in the nucleus. Other proteins that are influenced by leptomycinB are actin, c-Abl, cyclin B1, MDM2/p53, IκB, MPF, and PKA. The suggested inhibition mechanism involves the direct binding of leptomycinB to CRM1, which blocks the binding of CRM1 to proteins containing the nuclear export signal, via the interaction with cysteine residue in CRM1 control conserved region.
Mechanism of action
The nuclear export inhibition mechanism involves the direct binding of Leptomycin B to exportin1, which blocks the binding of exportin1 to proteins containing the leucine-rich NES. Later, NES-exportin1 interaction was identified on a conserved region near cysteine-529 residue of human exportin1. This cysteine-529 residue on exportin1 provides LMB sensitivity because unsaturated γ-lactone in LMB undergoes a Michael-type reaction by the sulfhydryl group on cysteine residue. Once LMB is bound to exportin1, the NES-bearing nuclear export cargo fails to bind the receptor.
storage
-20°C
Background
Leptomycin B, originally discovered and utilized as a potent anti-fungal antibiotic from Streptomyces sp., has more recently been identified to inhibit nuclear export of proteins and RNA containing a Nuclear Export Sequence. The mechanism behind LMB's potent inhibition is achieved by specifically binding to chromosomal region maintenance/exportin 1 protein; CRM1 binds to ribonuclear proteins containing the NES. LMB has also been reported to inhibit the degradation and subsequently lead to accumulation of p53 within the nucleus and has demonstrated specific anti-tumor properties, although toxic, at high doses.
References
[1] NOBUAKI KUDO . Leptomycin B Inhibition of Signal-Mediated Nuclear Export by Direct Binding to CRM1[J]. Experimental cell research, 1998, 242 2: Pages 540-547. DOI:10.1006/excr.1998.4136
[2] B WOLFF Y W J J Sanglier. Leptomycin B is an inhibitor of nuclear export: inhibition of nucleo-cytoplasmic translocation of the human immunodeficiency virus type 1 (HIV-1) Rev protein and Rev-dependent mRNA.[J]. Chemistry & biology, 1997, 4 2: 139-147. DOI:10.1016/s1074-5521(97)90257-x
[3] D A FREEDMAN A J L. Nuclear export is required for degradation of endogenous p53 by MDM2 and human papillomavirus E6.[J]. Molecular and Cellular Biology, 1998, 18 12: 7288-7293. DOI:10.1128/mcb.18.12.7288
Leptomycin B Preparation Products And Raw materials
Leptomycin B Suppliers
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Shanghai Degayuan Biotechnology Co., Ltd | 18301711315 18301711315 | 851746237@qq.com | China | 245 | 58 |
| Wuhan SynBioLily Biotechnology Co.,Ltd. | 18971458902 | yangsong@synbiolily.com | China | 482 | 58 |
| J & K SCIENTIFIC LTD. | 18210857532 18210857532 | jkinfo@jkchemical.com | China | 96815 | 76 |
| 3B Pharmachem (Wuhan) International Co.,Ltd. | 18930552037 | 3bsc@sina.com | China | 15813 | 69 |
| Chembest Research Laboratories Limited | 021-20908456 | sales@BioChemBest.com | China | 5996 | 61 |
| Beijing HwrkChemical Technology Co., Ltd | 89508211 18501085097 | sales.bj@hwrkchemical.com | China | 9407 | 55 |
| T&W GROUP | 021-61551611 13296011611 | contact@trustwe.com | China | 9884 | 58 |
| Shanghai Aladdin Bio-Chem Technology Co.,LTD | 400-6206333 13167063860 | anhua.mao@aladdin-e.com | China | 29977 | 65 |
| Shanghai Witofly Chemical Co.,Ltd | sales@witofly.com | China | 2853 | 52 | |
| Guangzhou Isun Pharmaceutical Co., Ltd | 020-39119399 18927568969 | isunpharm@qq.com | China | 4773 | 55 |
View Latest Price from Leptomycin B manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-07-15 | Leptomycin B
87081-35-4
|
$213.00-652.00 | 99.71% | 10g | TargetMol Chemicals Inc. | ||
 |
2019-12-26 | LEPTOMYCIN B FROM STREPTOMYCES SP
87081-35-4
|
$1.00 | 1g | ≥98% | Career Henan Chemical Co |
-
- Leptomycin B
87081-35-4
- $213.00-652.00
- 99.71%
- TargetMol Chemicals Inc.
-
- LEPTOMYCIN B FROM STREPTOMYCES SP
87081-35-4
- $1.00
- ≥98%
- Career Henan Chemical Co
