Part of the 50S ribosomal subunit (PubMed:1225626, PubMed:10094780, PubMed:12809609, PubMed:16272117, PubMed:25310980, PubMed:24844575, PubMed:27934701, PubMed:27906160, PubMed:27906161). Cross-links to the 23S rRNA (PubMed:7556101, PubMed:6170935). Cross-links to the A and P site tRNAs (PubMed:8524654). Belongs to the bacterial ribosomal protein bL27 family.