ribosome disassembly / translation elongation factor activity / large ribosomal subunit / transferase activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / 5S rRNA binding / ribosomal large subunit assembly / cytosolic small ribosomal subunit ...ribosome disassembly / translation elongation factor activity / large ribosomal subunit / transferase activity / ribosomal small subunit biogenesis / ribosomal small subunit assembly / small ribosomal subunit / 5S rRNA binding / ribosomal large subunit assembly / cytosolic small ribosomal subunit / large ribosomal subunit rRNA binding / small ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / negative regulation of translation / rRNA binding / ribosome / structural constituent of ribosome / translation / ribonucleoprotein complex / GTPase activity / mRNA binding / GTP binding / RNA binding / zinc ion binding / metal ion binding / cytosol / cytoplasm Similarity search - Function
: / Elongation factor G, domain III / EFG, domain V / Ribosomal protein L7/L12, oligomerisation / Ribosomal protein L7/L12, oligomerisation domain superfamily / Ribosomal protein L7/L12 dimerisation domain / Ribosomal protein L7/L12 / Ribosomal protein L7/L12, C-terminal / Ribosomal protein L7/L12 C-terminal domain / Ribosomal protein L7/L12, C-terminal/adaptor protein ClpS-like ...: / Elongation factor G, domain III / EFG, domain V / Ribosomal protein L7/L12, oligomerisation / Ribosomal protein L7/L12, oligomerisation domain superfamily / Ribosomal protein L7/L12 dimerisation domain / Ribosomal protein L7/L12 / Ribosomal protein L7/L12, C-terminal / Ribosomal protein L7/L12 C-terminal domain / Ribosomal protein L7/L12, C-terminal/adaptor protein ClpS-like / Elongation Factor G, domain II / Elongation Factor G, domain III / Ribosomal protein L10, eubacterial, conserved site / Ribosomal protein L10 signature. / Translation elongation factor EFG/EF2, domain IV / Elongation factor G, domain IV / Elongation factor G, domain IV / Elongation factor G C-terminus / Ribosomal protein L25, long-form / Ribosomal protein L25, beta domain / Ribosomal protein L25, C-terminal / Ribosomal protein TL5, C-terminal domain / Ribosomal protein L10 / Elongation factor EFG, domain V-like / Elongation factor G C-terminus / EF-G domain III/V-like / : / : / Ribosomal protein S14, type Z / Translation elongation factor EFTu-like, domain 2 / Ribosomal protein L11, bacterial-type / Elongation factor Tu domain 2 / Ribosomal protein L31 type A / Ribosomal protein S16, conserved site / Ribosomal protein S16 signature. / Translational (tr)-type GTP-binding domain / Elongation factor Tu GTP binding domain / Translational (tr)-type guanine nucleotide-binding (G) domain profile. / Ribosomal protein L31 signature. / Ribosomal protein L31 / Ribosomal protein L31 superfamily / Ribosomal protein L31 / Ribosomal protein L11, conserved site / Ribosomal protein L11 signature. / Ribosomal protein L10-like domain superfamily / : / Ribosomal protein L10P / Ribosomal protein L10 / Ribosomal protein L16 signature 1. / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / Ribosomal protein L16 signature 2. / Ribosomal protein L16, conserved site / Ribosomal protein L6, conserved site / Ribosomal protein L6 signature 1. / : / Ribosomal protein L9 signature. / Ribosomal protein L9, bacteria/chloroplast / Ribosomal protein L9, C-terminal / Ribosomal protein L9, C-terminal domain / Ribosomal protein L9, C-terminal domain superfamily / Ribosomal protein L11, N-terminal / Ribosomal protein L11, N-terminal domain / Ribosomal protein L11/L12 / Ribosomal protein L11, C-terminal / Ribosomal protein L11, C-terminal domain superfamily / Ribosomal protein L11/L12, N-terminal domain superfamily / Ribosomal protein L11/L12 / Ribosomal protein L11, RNA binding domain / Ribosomal protein L17 signature. / Ribosomal L25p family / Ribosomal protein L25 / Ribosomal protein L36 signature. / Ribosomal protein L28/L24 superfamily / Ribosomal protein L25/Gln-tRNA synthetase, N-terminal / Ribosomal protein L25/Gln-tRNA synthetase, anti-codon-binding domain superfamily / Ribosomal protein L9, N-terminal domain superfamily / Ribosomal protein L9 / Ribosomal protein L9, N-terminal / Ribosomal protein L9, N-terminal domain / Ribosomal protein L33, conserved site / Ribosomal protein L33 signature. / Ribosomal protein L35, conserved site / Ribosomal protein L35 signature. / Ribosomal protein L28 / Ribosomal protein L35, non-mitochondrial / : / Ribosomal protein L18, bacterial-type / : / Ribosomal protein S19, bacterial-type / Ribosomal protein S3, bacterial-type / Ribosomal protein L5, bacterial-type / Ribosomal protein L6, bacterial-type / Ribosomal protein S13, bacterial-type / Ribosomal protein S6, conserved site / Ribosomal protein S6 signature. / Ribosomal protein S7, bacterial/organellar-type / Ribosomal protein S9, bacterial/plastid / Ribosomal protein L9/RNase H1, N-terminal / Ribosomal protein S11, bacterial-type Similarity search - Domain/homology
Small ribosomal subunit protein bS6 / Large ribosomal subunit protein bL33A / Large ribosomal subunit protein uL11 / Large ribosomal subunit protein uL10 / Large ribosomal subunit protein bL12 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein uS10 / Large ribosomal subunit protein uL3 / Large ribosomal subunit protein uL4 ...Small ribosomal subunit protein bS6 / Large ribosomal subunit protein bL33A / Large ribosomal subunit protein uL11 / Large ribosomal subunit protein uL10 / Large ribosomal subunit protein bL12 / Small ribosomal subunit protein uS12 / Small ribosomal subunit protein uS7 / Small ribosomal subunit protein uS10 / Large ribosomal subunit protein uL3 / Large ribosomal subunit protein uL4 / Large ribosomal subunit protein uL23 / Large ribosomal subunit protein uL2 / Small ribosomal subunit protein uS19 / Large ribosomal subunit protein uL22 / Small ribosomal subunit protein uS3 / Large ribosomal subunit protein uL16 / Large ribosomal subunit protein uL29 / Small ribosomal subunit protein uS17 / Large ribosomal subunit protein uL14 / Large ribosomal subunit protein uL24 / Large ribosomal subunit protein uL5 / Small ribosomal subunit protein uS14B / Small ribosomal subunit protein uS8 / Large ribosomal subunit protein uL6 / Small ribosomal subunit protein uS5 / Large ribosomal subunit protein uL30 / Large ribosomal subunit protein bL36 / Small ribosomal subunit protein uS13 / Small ribosomal subunit protein uS11 / Small ribosomal subunit protein uS4 / Large ribosomal subunit protein bL17 / Large ribosomal subunit protein uL13 / Small ribosomal subunit protein uS9 / Uncharacterized protein / Small ribosomal subunit protein bS16 / Large ribosomal subunit protein bL19 / Small ribosomal subunit protein uS2 / Small ribosomal subunit protein uS15 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein bL35 / Small ribosomal subunit protein bS20 / Large ribosomal subunit protein bL27 / Large ribosomal subunit protein bL21 / Large ribosomal subunit protein bL31 / Large ribosomal subunit protein bL32 / Elongation factor G-like protein / Large ribosomal subunit protein bL9 / Small ribosomal subunit protein bS18B / Large ribosomal subunit protein bL34 / Large ribosomal subunit protein uL18 / Large ribosomal subunit protein bL28 / Large ribosomal subunit protein uL15 / Large ribosomal subunit protein bL25 Similarity search - Component
Biological species
Mycolicibacterium smegmatis MC2 155 (bacteria)
Method
single particle reconstruction / cryo EM / Resolution: 4.7 Å
Council of Scientific & Industrial Research (CSIR)
MLP-139
India
Citation
Journal: FEBS J / Year: 2025 Title: Cryo-EM structural analyses reveal a unique role for elongation factor G2 (EF-G2) in Mycobacteria. Authors: Priya Baid / Jayati Sengupta / Abstract: The gene-encoding translation elongation factor G (EF-G) has undergone gene duplication across various bacterial species including Mycobacteria, and in mammalian mitochondria, leading to the ...The gene-encoding translation elongation factor G (EF-G) has undergone gene duplication across various bacterial species including Mycobacteria, and in mammalian mitochondria, leading to the emergence of the paralogue elongation factor G2 (EF-G2). Our study reveals that mycobacterial EF-G2, unlike EF-G1, neither participates in ribosome-recycling nor significantly contributes to overall translation, suggesting that it plays an alternative role in Mycobacteria. Remarkably, our investigation found a significant overexpression of mycobacterial EF-G2 during the stationary growth phase. Moreover, EF-G2 lacks ribosome-dependent GTPase activity, an observation consistent with previous reports. Cryo-EM analysis of the M. smegmatis 70S ribosome purified from the nutrient-starved (stationary) phase and complexed with EF-G2 unveiled the structural basis for its inability to hydrolyse GTP in a ribosome-dependent manner. Furthermore, we report an unprecedented binding mode of two EF-G2 copies on the 50S ribosomal subunit that impedes subunit association, thereby preventing the formation of active 70S ribosomes. Thus, instead of performing canonical functions, mycobacterial EF-G2 acts as a translation repressor during nutrient starvation. Altogether, our findings shed light on the multifaceted mechanisms by which EF-G2 modulates protein synthesis under nutrient-limited conditions, providing insights into adaptive strategies employed by Mycobacteria to survive in hostile environments.
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