scholarly journals Three-dimensional location of ribosomal protein BL2 from Bacillus stearothermophilus , a key component of the peptidyl transferase center

FEBS Letters ◽  
1988 ◽  
Vol 233 (1) ◽  
pp. 119-123 ◽  
Author(s):  
W. Hackl ◽  
M. Stöffler-Meilicke ◽  
G. Stöffler
Keyword(s):  
Ribosomal Protein ◽  
Bacillus Stearothermophilus ◽  
Three Dimensional ◽  
Peptidyl Transferase ◽  
Peptidyl Transferase Center

scholarly journals The GTPase Nog1 co-ordinates the assembly, maturation and quality control of distant ribosomal functional centers

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Purnima Klingauf-Nerurkar ◽  
Ludovic C Gillet ◽  
Daniela Portugal-Calisto ◽  
Michaela Oborská-Oplová ◽  
Martin Jäger ◽  
...  
Keyword(s):  
Quality Control ◽  
Protein Folding ◽  
Atpase Activity ◽  
Ribosomal Protein ◽  
Peptidyl Transferase ◽  
Peptidyl Transferase Center ◽  
Eukaryotic Ribosome ◽  
Ribosomal Stalk ◽  
Exit Tunnel ◽  
Ribosome Formation

Eukaryotic ribosome precursors acquire translation competence in the cytoplasm through stepwise release of bound assembly factors, and proofreading of their functional centers. In case of the pre-60S, these steps include removal of placeholders Rlp24, Arx1 and Mrt4 that prevent premature loading of the ribosomal protein eL24, the protein-folding machinery at the polypeptide exit tunnel (PET), and the ribosomal stalk, respectively. Here, we reveal that sequential ATPase and GTPase activities license release factors Rei1 and Yvh1 to trigger Arx1 and Mrt4 removal. Drg1-ATPase activity removes Rlp24 from the GTPase Nog1 on the pre-60S; consequently, the C-terminal tail of Nog1 is extracted from the PET. These events enable Rei1 to probe PET integrity and catalyze Arx1 release. Concomitantly, Nog1 eviction from the pre-60S permits peptidyl transferase center maturation, and allows Yvh1 to mediate Mrt4 release for stalk assembly. Thus, Nog1 co-ordinates the assembly, maturation and quality control of distant functional centers during ribosome formation.

scholarly journals Resistance to the Peptidyl Transferase Inhibitor Tiamulin Caused by Mutation of Ribosomal Protein L3

2003 ◽  
Vol 47 (9) ◽  
pp. 2892-2896 ◽  
Author(s):  
Jacob Bøsling ◽  
Susan M. Poulsen ◽  
Birte Vester ◽  
Katherine S. Long
Keyword(s):  
Ribosomal Protein ◽  
Drug Binding ◽  
Mechanisms Of Resistance ◽  
Peptidyl Transferase ◽  
Peptidyl Transferase Center ◽  
Resistance Determinants ◽  
Drug Binding Site ◽  
Gene Coding ◽  
Bacterial Ribosome ◽  
Ribosomal Protein L3

ABSTRACT The antibiotic tiamulin targets the 50S subunit of the bacterial ribosome and interacts at the peptidyl transferase center. Tiamulin-resistant Escherichia coli mutants were isolated in order to elucidate mechanisms of resistance to the drug. No mutations in the rRNA were selected as resistance determinants using a strain expressing only a plasmid-encoded rRNA operon. Selection in a strain with all seven chromosomal rRNA operons yielded a mutant with an A445G mutation in the gene coding for ribosomal protein L3, resulting in an Asn149Asp alteration. Complementation experiments and sequencing of transductants demonstrate that the mutation is responsible for the resistance phenotype. Chemical footprinting experiments show a reduced binding of tiamulin to mutant ribosomes. It is inferred that the L3 mutation, which points into the peptidyl transferase cleft, causes tiamulin resistance by alteration of the drug-binding site. This is the first report of a mechanism of resistance to tiamulin unveiled in molecular detail.

scholarly journals Mutations in Ribosomal Protein L3 Are Associated with Oxazolidinone Resistance in Staphylococci of Clinical Origin

2009 ◽  
Vol 53 (12) ◽  
pp. 5275-5278 ◽  
Author(s):  
Jeffrey B. Locke ◽  
Mark Hilgers ◽  
Karen Joy Shaw
Keyword(s):  
Staphylococcus Aureus ◽  
Sequence Analysis ◽  
Ribosomal Protein ◽  
Binding Site ◽  
Staphylococcus Epidermidis ◽  
Peptidyl Transferase ◽  
Peptidyl Transferase Center ◽  
Ribosomal Protein L3

ABSTRACT Following recent reports of ribosomal protein L3 mutations in laboratory-derived linezolid-resistant (LZDr) Staphylococcus aureus, we investigated whether similar mutations were present in LZDr staphylococci of clinical origin. Sequence analysis of a variety of LZDr isolates revealed two L3 mutations, ΔSer145 (S. aureus NRS127) and Ala157Arg (Staphylococcus epidermidis 1653059), both occurring proximal to the oxazolidinone binding site in the peptidyl transferase center. The oxazolidinone torezolid maintained a ≥8-fold potency advantage over linezolid for both strains.

scholarly journals NAC covers ribosome-associated nascent chains thereby forming a protective environment for regions of nascent chains just emerging from the peptidyl transferase center.

1995 ◽  
Vol 130 (3) ◽  
pp. 519-528 ◽  
Author(s):  
S Wang ◽  
H Sakai ◽  
M Wiedmann
Keyword(s):  
Amino Acids ◽  
Ribosomal Protein ◽  
Ribosomal Proteins ◽  
Peptidyl Transferase ◽  
Nascent Polypeptide ◽  
Peptidyl Transferase Center ◽  
Protease Resistance ◽  
Protective Environment ◽  
Cytosolic Factors

We demonstrate that nascent polypeptide-associated complex (NAC) is one of the first cytosolic factors that newly synthesized nascent chains encounter. When NAC is present, nascent chains are segregated from the cytosol until approximately 30 amino acids in length, a finding consistent with the well-documented protease resistance of short ribosome-associated nascent chains. When NAC is removed, the normally protected nascent chains are susceptible to proteolysis. Therefore NAC, by covering COOH-terminal segments of nascent chains on the ribosome, perhaps together with ribosomal proteins, forms a protective environment for regions of nascent chains just emerging from the peptidyl transferase center. Since NAC is not a core ribosomal protein, the emergence of nascent chains from the ribosome may be more dynamic than previously thought.

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