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3J3V

Atomic model of the immature 50S subunit from Bacillus subtilis (state I-a)

Summary for 3J3V
Entry DOI10.2210/pdb3j3v/pdb
Related3J3W
EMDB information5642
Descriptor50S ribosomal protein L32, 50S ribosomal protein L5, 50S ribosomal protein L6, ... (24 entities in total)
Functional Keywordsribosome biogenesis, ribosome assembly, rna folding, ylqf, ribosome
Biological sourceBacillus subtilis
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Total number of polymer chains24
Total formula weight1314096.31
Authors
Li, N.,Guo, Q.,Zhang, Y.,Yuan, Y.,Ma, C.,Lei, J.,Gao, N. (deposition date: 2013-04-28, release date: 2013-06-12, Last modification date: 2024-03-20)
Primary citationLi, N.,Chen, Y.,Guo, Q.,Zhang, Y.,Yuan, Y.,Ma, C.,Deng, H.,Lei, J.,Gao, N.
Cryo-EM structures of the late-stage assembly intermediates of the bacterial 50S ribosomal subunit
Nucleic Acids Res., 41:7073-7083, 2013
Cited by
PubMed Abstract: Ribosome assembly is a process fundamental for all cellular activities. The efficiency and accuracy of the subunit assembly are tightly regulated and closely monitored. In the present work, we characterized, both compositionally and structurally, a set of in vivo 50S subunit precursors (45S), isolated from a mutant bacterial strain. Our qualitative mass spectrometry data indicate that L28, L16, L33, L36 and L35 are dramatically underrepresented in the 45S particles. This protein spectrum shows interesting similarity to many qualitatively analyzed 50S precursors from different genetic background, indicating the presence of global rate-limiting steps in the late-stage assembly of 50S subunit. Our structural data reveal two major intermediate states for the 45S particles. Consistently, both states severally lack those proteins, but they also differ in the stability of the functional centers of the 50S subunit, demonstrating that they are translationally inactive. Detailed analysis indicates that the orientation of H38 accounts for the global conformational differences in these intermediate structures, and suggests that the reorientation of H38 to its native position is rate-limiting during the late-stage assembly. Especially, H38 plays an essential role in stabilizing the central protuberance, through the interaction with the 5S rRNA, and the correctly orientated H38 is likely a prerequisite for further maturation of the 50S subunit.
PubMed: 23700310
DOI: 10.1093/nar/gkt423
PDB entries with the same primary citation
Experimental method
ELECTRON MICROSCOPY (13.3 Å)
Structure validation

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数据于2025-06-25公开中

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