Home Microbiology Antibiotics chemical Retapamulin For research use only.

Retapamulin

Synonyms: SB-275833

Retapamulin (SB-275833) is a topical antibiotic, which binds to both E. coli and S. aureus ribosomes with similar potencies with Kd of 3 nM.

Retapamulin Chemical Structure

Retapamulin Chemical Structure

CAS No. 224452-66-8

Purity & Quality Control

Retapamulin Related Products

Biological Activity

Description Retapamulin (SB-275833) is a topical antibiotic, which binds to both E. coli and S. aureus ribosomes with similar potencies with Kd of 3 nM.
Features Retapamulin is insoluble in water but is soluble in dimethyl sulfoxide and methanol.
Targets
ribosome [1] ribosome [1]
3 nM(Kd)
In vitro
In vitro Retapamulin is a potent inhibitor of protein synthesis with an IC50 of 0.33 μM in lysates prepared from erythromycin-susceptible E. coli cells. Retapamulin (100 μM) is ineffective in inhibiting eukaryotic translation when tested in a rabbit reticulocyte lysate system with the cellular components necessary for mammalian protein synthesis. Retapamulin binds to Erys ribosomes and fully displaces the labeled ligand with an IC50 of 26.1 nM. Retapamulin partially inhibits the ability of charged, N-blocked tRNA to bind to the P-site of E. coli ribosomes, with an IC50 of 17.4 nM (maximum inhibition of 80%). [1] Retapamulin inhibits Staphylococcus aureus and Streptococcus pyogenes with MIC90 of 0.12 μg/mL and ≤0.03 μg/mL, respectively. Retapamulin inhibits S. aureus subset with MIC50/90 values of 0.06/0.12 μg/mL. Retapamulin shows excellent activity against these isolates, with only two requiring a MIC of 0.06 μg/mL. [2] Retapamulin is very active against the S. pyogenes isolates tested with MIC90 of 0.016 μg/mL, and based on MIC90s, is 32- and >1,024-fold more active than mupirocin and fusidic acid, respectively. Retapamulin binds to a unique site on the bacterial ribosome, and by virtue of its novel mode of action. [3] Retapamulin (<2 mg/L) inhibits 37/52 (71%) strains of the B. fragilis group and 85/87 (98%) of the other Gram-negative bacilli. Retapamulin is more active than clindamycin, metronidazole and ceftriaxone against Propionibacterium acnes and anaerobic Gram-positive cocci. [4] Retapamulin inhibits total viable cells (TVC), Protein synthesis and 50S subunit synthesis in both wild-type (wt) Staphylococcus aureus strain RN1786 with IC50 of 12 ng/mL, 5 ng/mL and 27 ng/mL, respectively. [5]
NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT03304873 Completed
MRSA
NYU Langone Health
 December 1 2017 Phase 3
NCT01812382 Completed
Skin Infections Bacterial
GlaxoSmithKline
 April 2 2014 Phase 1
NCT01445600 Completed
Skin Infections Bacterial
GlaxoSmithKline
 November 2012 --
NCT00903279 Withdrawn
Orthopedic Procedures|Methicillin-resistant Staphylococcus Aureus
Bay Pines VA Healthcare System
 August 2009 Phase 2

Chemical Information & Solubility

Molecular Weight 517.76 Formula

C30H47NO4S
CAS No. 224452-66-8 SDF --
Smiles CC1CCC23CCC(=O)C2C1(C(CC(C(C3C)O)(C)C=C)OC(=O)CSC4CC5CCC(C4)N5C)C
Storage (From the date of receipt)

In vitro
Batch:

DMSO : 104 mg/mL ( (200.86 mM) Moisture-absorbing DMSO reduces solubility. Please use fresh DMSO.)

Ethanol : 104 mg/mL

Water : Insoluble


Molecular Weight Calculator

In vivo
Batch:

Add solvents to the product individually and in order.


In vivo Formulation Calculator

Preparing Stock Solutions

Molarity Calculator

Mass Concentration Volume Molecular Weight

In vivo Formulation Calculator (Clear solution)

Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment)

mg/kg g μL

Step 2: Enter the in vivo formulation (This is only the calculator, not formulation. Please contact us first if there is no in vivo formulation at the solubility Section.)

% DMSO % % Tween 80 % ddH2O
%DMSO %

Calculation results:

Working concentration: mg/ml;

Method for preparing DMSO master liquid: mg drug pre-dissolved in μL DMSO ( Master liquid concentration mg/mL, Please contact us first if the concentration exceeds the DMSO solubility of the batch of drug. )

Method for preparing in vivo formulation: Take μL DMSO master liquid, next addμL PEG300, mix and clarify, next addμL Tween 80, mix and clarify, next add μL ddH2O, mix and clarify.

Method for preparing in vivo formulation: Take μL DMSO master liquid, next add μL Corn oil, mix and clarify.

Note: 1. Please make sure the liquid is clear before adding the next solvent.
2. Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such
as vortex, ultrasound or hot water bath can be used to aid dissolving.

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

Tel: +1-832-582-8158 Ext:3
If you have any other enquiries, please leave a message.

* Indicates a Required Field

Please enter your name.
Please enter your email. Please enter a valid email address.
Please write something to us.
Tags: buy Retapamulin | Retapamulin ic50 | Retapamulin price | Retapamulin cost | Retapamulin solubility dmso | Retapamulin purchase | Retapamulin manufacturer | Retapamulin research buy | Retapamulin order | Retapamulin mouse | Retapamulin chemical structure | Retapamulin mw | Retapamulin molecular weight | Retapamulin datasheet | Retapamulin supplier | Retapamulin in vitro | Retapamulin cell line | Retapamulin concentration | Retapamulin nmr