Antimicrobial
Streptogramins
Synergistic 50S protein-synthesis blockers
strep-toh-GRAM-inz
High-yield clue
The two streptogramin components are synergistic: dalfopristin binding reshapes the ribosome to boost quinupristin binding, turning bacteriostatic into bactericidal.
Overview
An antibacterial class (quinupristin-dalfopristin) of two components that bind the 50S ribosomal subunit at adjacent sites, used to teach synergistic ribosome inhibition of resistant Gram-positives.
Classification
- Antibacterial
- 50S ribosomal subunit target
- Two-component (A + B) synergy
- Gram-positive spectrum vocabulary
Lab & identification clues
- Bind peptidyl transferase center / exit tunnel vocabulary
- Quinupristin binds like a macrolide in the exit tunnel concept
- Cross-resistance with macrolides/lincosamides (MLS) framing
Associations
- Resistant Gram-positive study association (vancomycin-resistant E. faecium and MRSA; E. faecalis is intrinsically resistant)
- Protein synthesis inhibition concept
- MLSb resistance vocabulary
Commonly confused with
- Macrolides
- Lincosamides (clindamycin)
Frequently asked questions
What is Streptogramins?
An antibacterial class (quinupristin-dalfopristin) of two components that bind the 50S ribosomal subunit at adjacent sites, used to teach synergistic ribosome inhibition of resistant Gram-positives.
What is the high-yield clue for Streptogramins?
The two streptogramin components are synergistic: dalfopristin binding reshapes the ribosome to boost quinupristin binding, turning bacteriostatic into bactericidal.
What is Streptogramins associated with?
Streptogramins is associated with Resistant Gram-positive study association (vancomycin-resistant E. faecium and MRSA; E. faecalis is intrinsically resistant), Protein synthesis inhibition concept, and MLSb resistance vocabulary.
What is Streptogramins commonly confused with?
Streptogramins is commonly confused with Macrolides and Lincosamides (clindamycin).
Original mechanism summary for microbiology study. Sources checked: CDC antimicrobial-resistance guidance, NCBI Bookshelf Medical Microbiology, and standard coursework frameworks; reviewed 2026-06. Covers class, mechanism, and resistance vocabulary only; no prescribing, dosing, or patient-specific treatment guidance.