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- PDB-7u2b: Cryo-electron microscopy structure of human mt-SerRS in complex w... -

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Basic information

Entry
Database: PDB / ID: 7u2b
TitleCryo-electron microscopy structure of human mt-SerRS in complex with mt-tRNA(GCU-TL)
Components
  • RNA (53-MER)
  • Serine--tRNA ligase, mitochondrial
Keywordsligase/RNA / tRNA / SerRS / ligase-RNA complex / mitochondria / aminoacylation
Function / homology
Function and homology information


mitochondrial seryl-tRNA aminoacylation / Mitochondrial tRNA aminoacylation / serine-tRNA ligase / serine-tRNA ligase activity / seryl-tRNA aminoacylation / tRNA binding / mitochondrial matrix / mitochondrion / RNA binding / ATP binding
Similarity search - Function
Serine-tRNA ligase, type1 / Serine-tRNA ligase catalytic core domain / Serine-tRNA synthetase, type1, N-terminal domain superfamily / Class I and II aminoacyl-tRNA synthetase, tRNA-binding arm / Aminoacyl-tRNA synthetase, class II (G/ P/ S/T) / tRNA synthetase class II core domain (G, H, P, S and T) / Aminoacyl-tRNA synthetase, class II / Aminoacyl-transfer RNA synthetases class-II family profile. / Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL)
Similarity search - Domain/homology
5'-O-(N-(L-SERYL)-SULFAMOYL)ADENOSINE / RNA / RNA (> 10) / Serine--tRNA ligase, mitochondrial
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsHirschi, M. / Kuhle, B. / Doerfel, L. / Schimmel, P. / Lander, G.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Aging (NIH/NIA)R01GM125908 United States
National Institutes of Health/National Institute on Aging (NIH/NIA)AG067594 United States
National Institutes of Health/National Institute on Aging (NIH/NIA)AG061697 United States
National Institutes of Health/Office of the DirectorS10OD021634 United States
CitationJournal: Nat Commun / Year: 2022
Title: Structural basis for shape-selective recognition and aminoacylation of a D-armless human mitochondrial tRNA.
Authors: Bernhard Kuhle / Marscha Hirschi / Lili K Doerfel / Gabriel C Lander / Paul Schimmel /
Abstract: Human mitochondrial gene expression relies on the specific recognition and aminoacylation of mitochondrial tRNAs (mtRNAs) by nuclear-encoded mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs). ...Human mitochondrial gene expression relies on the specific recognition and aminoacylation of mitochondrial tRNAs (mtRNAs) by nuclear-encoded mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs). Despite their essential role in cellular energy homeostasis, strong mutation pressure and genetic drift have led to an unparalleled sequence erosion of animal mtRNAs. The structural and functional consequences of this erosion are not understood. Here, we present cryo-EM structures of the human mitochondrial seryl-tRNA synthetase (mSerRS) in complex with mtRNA. These structures reveal a unique mechanism of substrate recognition and aminoacylation. The mtRNA is highly degenerated, having lost the entire D-arm, tertiary core, and stable L-shaped fold that define canonical tRNAs. Instead, mtRNA evolved unique structural innovations, including a radically altered T-arm topology that serves as critical identity determinant in an unusual shape-selective readout mechanism by mSerRS. Our results provide a molecular framework to understand the principles of mito-nuclear co-evolution and specialized mechanisms of tRNA recognition in mammalian mitochondrial gene expression.
History
DepositionFeb 23, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 14, 2022Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
C: RNA (53-MER)
A: Serine--tRNA ligase, mitochondrial
B: Serine--tRNA ligase, mitochondrial
hetero molecules


Theoretical massNumber of molelcules
Total (without water)134,4685
Polymers133,6013
Non-polymers8672
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: RNA chain RNA (53-MER)


Mass: 16884.113 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli (E. coli)
#2: Protein Serine--tRNA ligase, mitochondrial / SerRSmt / Seryl-tRNA synthetase / SerRS / Seryl-tRNA(Ser/Sec) synthetase


Mass: 58358.391 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SARS2, SARSM / Production host: Escherichia coli (E. coli) / References: UniProt: Q9NP81, serine-tRNA ligase
#3: Chemical ChemComp-SSA / 5'-O-(N-(L-SERYL)-SULFAMOYL)ADENOSINE


Mass: 433.397 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C13H19N7O8S
Has ligand of interestN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Human mt-SerRS in complex with mt-tRNA(GCU-TL) and SerSA
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TECNAI ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1200 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 66 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 118269 / Symmetry type: POINT

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