9hal

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Pooled 50S subunit d126_(L29)-/(L22)- precursor states supplemented with Api137

Structural highlights

9hal is a 9 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 4.49Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

RL20_ECOLI One of the primary rRNA binding proteins, it binds close to the 5'-end of the 23S rRNA. It is important during the early stages of 50S assembly.[HAMAP-Rule:MF_00382]

Publication Abstract from PubMed

The proline-rich antimicrobial designer peptide Api137 inhibits protein expression in bacteria by binding simultaneously to the ribosomal polypeptide exit tunnel and the release factor (RF), depleting the cellular RF pool and leading to ribosomal arrest at stop codons. This study investigates the additional effect of Api137 on the assembly of ribosomes using an Escherichia coli reporter strain expressing one ribosomal protein per 30S and 50S subunit tagged with mCherry and EGFP, respectively. Separation of cellular extracts derived from cells exposed to Api137 in a sucrose gradient reveals elevated levels of partially assembled and not fully matured precursors of the 50S subunit (pre-50S). High-resolution structures obtained by cryogenic electron microscopy demonstrate that a large proportion of pre-50S states are missing up to five proteins (uL22, bL32, uL29, bL23, and uL16) and have misfolded helices in 23S rRNA domain IV. These data suggest a second mechanism for Api137, wherein it disrupts 50S subunit assembly by inducing the formation of misfolded precursor particles potentially incapable of evolving into active ribosomes, suggesting a bactericidal mechanism.

The proline-rich antimicrobial peptide Api137 disrupts large ribosomal subunit assembly and induces misfolding.,Lauer SM, Gasse J, Krizsan A, Reepmeyer M, Sprink T, Nikolay R, Spahn CMT, Hoffmann R Nat Commun. 2025 Jan 10;16(1):567. doi: 10.1038/s41467-025-55836-8. PMID:39794318^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Lauer SM, Gasse J, Krizsan A, Reepmeyer M, Sprink T, Nikolay R, Spahn CMT, Hoffmann R. The proline-rich antimicrobial peptide Api137 disrupts large ribosomal subunit assembly and induces misfolding. Nat Commun. 2025 Jan 10;16(1):567. PMID:39794318 doi:10.1038/s41467-025-55836-8