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- PDB-6hd5: Cryo-EM structure of the ribosome-NatA complex -

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Basic information

Entry
Database: PDB / ID: 6hd5
TitleCryo-EM structure of the ribosome-NatA complex
Components
  • N-alpha-acetyltransferase NAT5
  • N-terminal acetyltransferase A complex catalytic subunit ARD1
  • N-terminal acetyltransferase A complex subunit NAT1
KeywordsTRANSLATION / N-terminal acetylation / protein modification / ribosome / expansion segments
Function / homology
Function and homology information


N-terminal protein amino acid propionylation / peptide-glutamate-alpha-N-acetyltransferase activity / N-terminal amino-acid Nalpha-acetyltransferase NatA / N-terminal methionine Nalpha-acetyltransferase NatE / peptide-serine-alpha-N-acetyltransferase activity / NatA complex / N-terminal protein amino acid acetylation / peptide alpha-N-acetyltransferase activity / mitotic sister chromatid cohesion / ribosome binding ...N-terminal protein amino acid propionylation / peptide-glutamate-alpha-N-acetyltransferase activity / N-terminal amino-acid Nalpha-acetyltransferase NatA / N-terminal methionine Nalpha-acetyltransferase NatE / peptide-serine-alpha-N-acetyltransferase activity / NatA complex / N-terminal protein amino acid acetylation / peptide alpha-N-acetyltransferase activity / mitotic sister chromatid cohesion / ribosome binding / mitochondrion / identical protein binding / cytoplasm
Similarity search - Function
N-terminal acetyltransferase A, auxiliary subunit / N-terminal acetyltransferase A, auxiliary subunit / N-acetyltransferase Ard1-like / Acetyltransferase (GNAT) family / Gcn5-related N-acetyltransferase (GNAT) domain profile. / GNAT domain / Tetratricopeptide repeats / Acyl-CoA N-acyltransferase / Tetratricopeptide repeat / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
N-terminal acetyltransferase A complex catalytic subunit ARD1 / N-terminal acetyltransferase A complex subunit NAT1 / N-alpha-acetyltransferase NAT5
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.8 Å
AuthorsKnorr, A.G. / Becker, T. / Beckmann, R.
Funding support Germany, 2items
OrganizationGrant numberCountry
German Research FoundationGRK1721 Germany
German Research FoundationFOR1805 Germany
CitationJournal: Nat Struct Mol Biol / Year: 2019
Title: Ribosome-NatA architecture reveals that rRNA expansion segments coordinate N-terminal acetylation.
Authors: Alexandra G Knorr / Christian Schmidt / Petr Tesina / Otto Berninghausen / Thomas Becker / Birgitta Beatrix / Roland Beckmann /
Abstract: The majority of eukaryotic proteins are N-terminally α-acetylated by N-terminal acetyltransferases (NATs). Acetylation usually occurs co-translationally and defects have severe consequences. ...The majority of eukaryotic proteins are N-terminally α-acetylated by N-terminal acetyltransferases (NATs). Acetylation usually occurs co-translationally and defects have severe consequences. Nevertheless, it is unclear how these enzymes act in concert with the translating ribosome. Here, we report the structure of a native ribosome-NatA complex from Saccharomyces cerevisiae. NatA (comprising Naa10, Naa15 and Naa50) displays a unique mode of ribosome interaction by contacting eukaryotic-specific ribosomal RNA expansion segments in three out of four binding patches. Thereby, NatA is dynamically positioned directly underneath the ribosomal exit tunnel to facilitate modification of the emerging nascent peptide chain. Methionine amino peptidases, but not chaperones or signal recognition particle, would be able to bind concomitantly. This work assigns a function to the hitherto enigmatic ribosomal RNA expansion segments and provides mechanistic insights into co-translational protein maturation by N-terminal acetylation.
History
DepositionAug 17, 2018Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 19, 2018Provider: repository / Type: Initial release
Revision 1.1Dec 26, 2018Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_abbrev / _citation.pdbx_database_id_DOI ..._citation.journal_abbrev / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Jan 16, 2019Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.year / _citation_author.identifier_ORCID

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Structure visualization

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Assembly

Deposited unit
t: N-terminal acetyltransferase A complex subunit NAT1
u: N-terminal acetyltransferase A complex catalytic subunit ARD1
v: N-alpha-acetyltransferase NAT5


Theoretical massNumber of molelcules
Total (without water)146,4393
Polymers146,4393
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area10110 Å2
ΔGint-51 kcal/mol
Surface area61800 Å2
MethodPISA

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Components

#1: Protein N-terminal acetyltransferase A complex subunit NAT1 / NatA complex subunit NAT1 / Amino-terminal / alpha-amino / acetyltransferase 1


Mass: 99050.133 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: ribosome binding subunit
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
References: UniProt: P12945
#2: Protein N-terminal acetyltransferase A complex catalytic subunit ARD1 / NatA complex subunit ARD1 / Arrest-defective protein 1


Mass: 27635.168 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: catalytic subunit
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
References: UniProt: P07347, N-terminal amino-acid Nalpha-acetyltransferase NatA
#3: Protein N-alpha-acetyltransferase NAT5 / NatA complex subunit NAT5


Mass: 19753.727 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Details: ribosome binding subunit
Source: (natural) Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
References: UniProt: Q08689, N-terminal methionine Nalpha-acetyltransferase NatE

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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: Ribosome-NatA complex / Type: COMPLEX
Details: Map was refined on NatA. Coordinates are deposited for NatA only.
Entity ID: all / Source: NATURAL
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
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: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 2.5 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k)

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Processing

EM software
IDNameCategory
1Gautomatchparticle selection
4GctfCTF correction
9RELIONinitial Euler assignment
10RELIONfinal Euler assignment
11RELIONclassification
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 262507 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT

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