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Chemical Structure| 224452-66-8 Chemical Structure| 224452-66-8

Structure of Retapamulin
CAS No.: 224452-66-8

Chemical Structure| 224452-66-8

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Retapamulin is the first agent in the new pleuromutilin class of antibacterials, used as a topical antibiotic.

Synonyms: SB-275833

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Product Details of Retapamulin

CAS No. :224452-66-8
Formula : C30H47NO4S
M.W : 517.76
SMILES Code : C[C@@H]1CC[C@@]23CCC(=O)[C@H]2[C@@]1([C@@H](C[C@@]([C@H]([C@@H]3C)O)(C)C=C)OC(=O)CS[C@@H]4C[C@H]5CC[C@@H](C4)N5C)C
Synonyms :
SB-275833
MDL No. :MFCD11045316
InChI Key :STZYTFJPGGDRJD-FJJJPKKESA-N
Pubchem ID :6918462

Safety of Retapamulin

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H332-H335
Precautionary Statements:P261-P280-P305+P351+P338

Isoform Comparison

Biological Activity

In Vitro:

Cell Line
Concentration Treated Time Description References
Escherichia coli BL21 100X MIC (5 μg/mL) 2 minutes Ribo-RET analysis identified 620 iTISs in the BL21 strain PMC7115971
Staphylococcus aureus N9 0.0625 mg/L 24 hours Evaluate the synergistic effect of Retapamulin with tetracycline (TET), showing synergy. PMC5572081
Staphylococcus aureus N54 0.0625 mg/L 24 hours Evaluate the synergistic effect of Retapamulin with tetracycline (TET), showing synergy. PMC5572081
Staphylococcus aureus ATCC 43300 0.03125 mg/L 24 hours Evaluate the synergistic effect of Retapamulin with tetracycline (TET), showing synergy. PMC5572081
Staphylococcus aureus ATCC 29213 0.0625 mg/L 24 hours Evaluate the synergistic effect of Retapamulin with tetracycline (TET), showing synergy. PMC5572081
Moraxella catarrhalis 0.03 μg/ml Evaluate the antibacterial activity of Retapamulin against Moraxella catarrhalis, showing an MIC90 of 0.03 μg/ml. PMC1635201
Haemophilus influenzae 2 μg/ml Evaluate the antibacterial activity of Retapamulin against Haemophilus influenzae, showing an MIC90 of 2 μg/ml. PMC1635201
Streptococcus pneumoniae 0.12 μg/ml Evaluate the antibacterial activity of Retapamulin against Streptococcus pneumoniae, showing an MIC90 of 0.12 μg/ml. PMC1635201
Streptococcus agalactiae 0.03 μg/ml Evaluate the antibacterial activity of Retapamulin against Streptococcus agalactiae, showing an MIC90 of 0.03 μg/ml. PMC1635201
Staphylococcus saprophyticus 0.12 μg/ml Evaluate the antibacterial activity of Retapamulin against Staphylococcus saprophyticus, showing an MIC90 of 0.12 μg/ml. PMC1635201
Human liver microsomes 3 μM 1 hour Study the metabolic pathways of retapamulin in human liver microsomes, finding that the main metabolites were monohydroxylated and dihydroxylated derivatives. PMC5913982
Swine liver microsomes 3 μM 1 hour Study the metabolic pathways of retapamulin in swine liver microsomes, finding that the main metabolites were monohydroxylated and dihydroxylated derivatives. PMC5913982
Rat liver microsomes 3 μM 1 hour Study the metabolic pathways of retapamulin in rat liver microsomes, finding that the main metabolites were monohydroxylated and dihydroxylated derivatives. PMC5913982
Bacillus thuringiensis BMB171 0.5 μg/ml 6 hours To evaluate the effect of Retapamulin on LRR-regulated LacZ expression, results showed that 0.5 μg/ml Rtm induced approximately 63.9-fold change in expression. PMC8601186
Methicillin-resistant S. aureus (MRSA, A1024) 17-20 ng/ml 2 doubling times Inhibition of protein synthesis and 50S ribosomal subunit formation, no effect on 30S subunit PMC2043230
Wild-type Staphylococcus aureus (RN1786) 5-27 ng/ml 2 doubling times Inhibition of protein synthesis and 50S ribosomal subunit formation, no effect on 30S subunit PMC2043230
S. epidermidis 0.12 μg/ml Evaluate the antibacterial activity of Retapamulin against S. epidermidis, showing an MIC90 of 0.12 μg/ml. PMC1635201
Streptococcus pyogenes 0.016 μg/ml Evaluate the antibacterial activity of Retapamulin against Streptococcus pyogenes, showing an MIC90 of 0.016 μg/ml. PMC1635201
Staphylococcus aureus 0.12 μg/ml Evaluate the antibacterial activity of Retapamulin against Staphylococcus aureus, showing an MIC90 of 0.12 μg/ml. PMC1635201
Streptococcus pneumoniae D39 62.5 ng/mL 2.5 minutes Identification of unannotated small open reading frames (sORFs) via ribosome profiling PMC9426450
Vero cells 5 μM, 7.5 μM, 10 μM 48 hours Retapamulin dose-dependently and significantly inhibited SARS-CoV-2-induced CPE, with a maximum inhibition of 75% (at 7.5 μM) and IC50 of 4.23 μM. PMC10711598
Vero cells 5 µM 48 hours To evaluate the inhibitory effect of Retapamulin on SARS-CoV-2-induced cytopathic effect (CPE), results showed ≥60% inhibition PMC10014809

In Vivo:

Species
Animal Model
Administration Dosage Frequency Description References
Mice Skin wound infection model Topical application 1% ointment Twice daily for 7 days Evaluate the efficacy of Retapamulin against USA300 MRSA skin infection, showing an 85-fold reduction in bacterial burden and a 53% decrease in inflammation PMC3059384
Escherichia coli ΔtolC derivative of the E. coli strain BW25113 32-fold MIC of RET 2 minutes RET treatment led to a striking ribosome redistribution PMC7115971
Galleria mellonella Galleria mellonella larvae infection model Injection 10 mg/kg Single dose, observed for 5 days Evaluate the in vivo synergistic effect of Retapamulin with tetracycline (TET), showing significant improvement in larval survival rates. PMC5572081
Rat Wistar rats Oral 15 mg/kg Single dose Study the metabolic pathways of retapamulin in rats, finding that the main metabolites were monohydroxylated and dihydroxylated derivatives. PMC5913982

Clinical Trial:

NCT Number Conditions Phases Recruitment Completion Date Locations
NCT01397461 Impetigo Phase 3 Completed - Germany ... More >> Georg Popp Augsburg, Germany Roland Aschoff Dresden, Germany Diamant Thaci Frankfurt/Main, Germany Klaus Chelius Köln, Germany Stephan Schilling Mahlow, Germany South Africa Ismail Mitha Benoni, South Africa Johan Lombaard Bloemfontein, South Africa Jan Fourie Dundee, South Africa Dawie Kruger George, South Africa Philip Nel Hatfield, South Africa Essack Mitha Johannesburg, South Africa J Trokis Kraaifontein, South Africa Mohammed Tayob Middelburg, South Africa Mashra Gani Port Elizabeth, South Africa Zelda Punt Port Elizabeth, South Africa Molefe Phayane Pretoria, South Africa Gail Todd Rondebosch, South Africa Yacoob Vahed Welkom, South Africa Christo van Dyk Worcester, South Africa Less <<
NCT01397461 - Completed - -
NCT00133874 Skin Infections, Bacterial Phase 3 Completed - -
NCT01591785 Hand Eczema F... More >>oot Eczema Less << Not Applicable Completed - United States, New York ... More >> Mount Sinai School of Medicine New York, New York, United States, 10029 Less <<
NCT00133848 Impetigo Phase 3 Completed - India ... More >> GSK Investigational Site Bangalore, India, 560 054 GSK Investigational Site Hyderabad, India, 40000 Italy GSK Investigational Site Roma, Lazio, Italy, 00133 Mexico GSK Investigational Site Zapopan, Jalisco, Jalisco, Mexico, 45190 GSK Investigational Site Mexico city, Mexico, 06780 Netherlands GSK Investigational Site Beek En Donk, Netherlands, 5741 CG GSK Investigational Site Deurne, Netherlands, 5751 XJ GSK Investigational Site Ermelo, Netherlands, 3851 EX GSK Investigational Site Gouda, Netherlands, 2806 DA GSK Investigational Site Musselkanaal, Netherlands, 9581 AD GSK Investigational Site Musselkanaal, Netherlands, 9581 AJ GSK Investigational Site Nijmegen, Netherlands, 6531 NB GSK Investigational Site Nijverdal, Netherlands, 7442 LS GSK Investigational Site Roelofarendsveen, Netherlands, 2371 RB GSK Investigational Site Rotterdam, Netherlands, 3015 GE GSK Investigational Site Rotterdam, Netherlands, 3082 DC GSK Investigational Site Soerendonk, Netherlands, 6027 RN GSK Investigational Site Woerden, Netherlands, 3443 GG GSK Investigational Site Zieuwent, Netherlands, 7136 KH GSK Investigational Site Zwijndrecht, Netherlands, 3331 LZ Peru GSK Investigational Site Callao, Peru, Callao 1 GSK Investigational Site Lima, Peru, Lima 31 Less <<
NCT00903279 Orthopedic Procedures ... More >> Methicillin-resistant Staphylococcus Aureus Less << Phase 2 Withdrawn(Funding) December 2010 United States, Florida ... More >> Bay Pines VAHCS Bay Pines, Florida, United States, 33744 Less <<
NCT00871208 Atopic Dermatitis Phase 4 Withdrawn(Funding withdrawn) - United States, New York ... More >> Department of Dermatology, Beth Israel Medical Center NY, New York, United States, 10003 Department of Dermatology, Roosevelt Hospital NY, New York, United States, 10019 Department of Dermatology, St. Luke's-Roosevelt-Hospital Center NY, New York, United States, 10025 Less <<
NCT00539994 Infections, Bacterial Phase 2 Completed - United States, California ... More >> GSK Investigational Site San Diego, California, United States, 92123 United States, Hawaii GSK Investigational Site Honolulu, Hawaii, United States, 96813 United States, Maryland GSK Investigational Site Baltimore, Maryland, United States, 21225 United States, Washington GSK Investigational Site Tacoma, Washington, United States, 98418 Less <<
NCT00852540 - Completed - -
NCT01064947 Atopic Dermatitis ... More >> Secondary Infection Less << Phase 4 Completed - United States, Kentucky ... More >> DermResearch, PLLC Louisville, Kentucky, United States, 40217 Less <<
NCT01064947 - Completed - -
NCT00684177 Skin Infections, Bacterial Phase 3 Completed - -
NCT00852540 Skin Infections, Bacterial Phase 3 Completed - -
NCT00684177 - Completed - -
NCT00856089 Methicillin-resistant Staphylo... More >>coccus Aureus Less << PHASE4 WITHDRAWN 2025-10-09 Tulane University School of Me... More >>dicine, New Orleans, Louisiana, 70112, United States|Ochsner Health System, New Orleans, Louisiana, 70121, United States Less <<
NCT01126268 Impetigo Foll... More >>iculitis Secondarily Infected Eczema Minor Soft Tissue Infections Less << Phase 4 Completed - United States, Texas ... More >> Houston Medical Center Building Houston, Texas, United States, 77030 Less <<
NCT00539994 - Completed - -
NCT01126268 - Completed - -
NCT00555061 Skin Infections, Bacterial Phase 4 Completed - -
NCT01153828 - Completed - -
NCT01461668 - Completed - -
NCT01445600 - Completed - Korea, Republic of ... More >> GSK Investigational Site Seoul, Korea, Republic of, 138-736 Less <<
NCT01153880 - Completed - -
NCT03304873 MRSA Phase 3 Recruiting February 2020 United States, New York ... More >> New York University School of Medicine Recruiting New York, New York, United States, 10016 Contact: Ami Patel, MD, MPH    212-263-5454       Principal Investigator: Jennifer Lighter, MD Less <<
NCT00555061 - Completed - -
NCT01812382 Skin Infections, Bacterial Phase 1 Completed - United States, Florida ... More >> GSK Investigational Site Gainesville, Florida, United States, 32610 Less <<
NCT01461668 Methicillin-Resistant Staphylo... More >>coccus Aureus Less << Phase 4 Completed - United States, California ... More >> University of California, Irivne Irvine, California, United States, 92617 Less <<

Protocol

Bio Calculators
Preparing Stock Solutions 1mg 5mg 10mg

1 mM

5 mM

10 mM

1.93mL

0.39mL

0.19mL

9.66mL

1.93mL

0.97mL

19.31mL

3.86mL

1.93mL

References

 

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