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- PDB-6vp9: Cryo-EM structure of human NatB complex -

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Basic information

Entry
Database: PDB / ID: 6vp9
TitleCryo-EM structure of human NatB complex
Components
  • MDVFM peptide
  • N-alpha-acetyltransferase 20
  • N-alpha-acetyltransferase 25, NatB auxiliary subunit
KeywordsTRANSFERASE / NatB / NAA20 / NAA25
Function / homology
Function and homology information


N-terminal peptidyl-glutamine acetylation / N-terminal methionine Nalpha-acetyltransferase NatB / N-terminal peptidyl-aspartic acid acetylation / N-terminal peptidyl-glutamic acid acetylation / NatB complex / N-terminal protein amino acid acetylation / peptide alpha-N-acetyltransferase activity / Golgi apparatus / nucleus / cytosol / cytoplasm
Similarity search - Function
N-acetyltransferase B complex, non-catalytic subunit / N-acetyltransferase B complex (NatB) non catalytic subunit / Acetyltransferase (GNAT) family / Gcn5-related N-acetyltransferase (GNAT) domain profile. / GNAT domain / TPR repeat region circular profile. / Acyl-CoA N-acyltransferase / Tetratricopeptide-like helical domain superfamily
Similarity search - Domain/homology
CARBOXYMETHYL COENZYME *A / N-alpha-acetyltransferase 20 / N-alpha-acetyltransferase 25, NatB auxiliary subunit
Similarity search - Component
Biological speciesHomo sapiens (human)
Escherichia coli K-12 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.46 Å
AuthorsDeng, S. / Marmorstein, R.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM118090 United States
CitationJournal: Elife / Year: 2020
Title: Molecular basis for N-terminal alpha-synuclein acetylation by human NatB.
Authors: Sunbin Deng / Buyan Pan / Leah Gottlieb / E James Petersson / Ronen Marmorstein /
Abstract: NatB is one of three major N-terminal acetyltransferase (NAT) complexes (NatA-NatC), which co-translationally acetylate the N-termini of eukaryotic proteins. Its substrates account for about 21% of ...NatB is one of three major N-terminal acetyltransferase (NAT) complexes (NatA-NatC), which co-translationally acetylate the N-termini of eukaryotic proteins. Its substrates account for about 21% of the human proteome, including well known proteins such as actin, tropomyosin, CDK2, and α-synuclein (αSyn). Human NatB (hNatB) mediated N-terminal acetylation of αSyn has been demonstrated to play key roles in the pathogenesis of Parkinson's disease and as a potential therapeutic target for hepatocellular carcinoma. Here we report the cryo-EM structure of hNatB bound to a CoA-αSyn conjugate, together with structure-guided analysis of mutational effects on catalysis. This analysis reveals functionally important differences with human NatA and NatB, resolves key hNatB protein determinants for αSyn N-terminal acetylation, and identifies important residues for substrate-specific recognition and acetylation by NatB enzymes. These studies have implications for developing small molecule NatB probes and for understanding the mode of substrate selection by NAT enzymes.
History
DepositionFeb 2, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 23, 2020Provider: repository / Type: Initial release
Revision 1.1Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: N-alpha-acetyltransferase 20
B: N-alpha-acetyltransferase 25, NatB auxiliary subunit
C: MDVFM peptide
hetero molecules


Theoretical massNumber of molelcules
Total (without water)132,6064
Polymers131,7803
Non-polymers8261
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area7080 Å2
ΔGint-36 kcal/mol
Surface area45180 Å2

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Components

#1: Protein N-alpha-acetyltransferase 20 / Methionine N-acetyltransferase / N-acetyltransferase 5 / N-terminal acetyltransferase B complex ...Methionine N-acetyltransferase / N-acetyltransferase 5 / N-terminal acetyltransferase B complex catalytic subunit NAA20 / N-terminal acetyltransferase B complex catalytic subunit NAT5 / NatB complex subunit NAT5 / NatB catalytic subunit


Mass: 18694.168 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: NAA20, NAT5 / Production host: Spodoptera frugiperda (fall armyworm)
References: UniProt: P61599, N-terminal methionine Nalpha-acetyltransferase NatB
#2: Protein N-alpha-acetyltransferase 25, NatB auxiliary subunit / Mitochondrial distribution and morphology protein 20 / N-terminal acetyltransferase B complex ...Mitochondrial distribution and morphology protein 20 / N-terminal acetyltransferase B complex subunit MDM20 / NatB complex subunit MDM20 / N-terminal acetyltransferase B complex subunit NAA25 / p120


Mass: 112444.258 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: NAA25, C12orf30, MDM20, NAP1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q14CX7
#3: Protein/peptide MDVFM peptide


Mass: 641.799 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Escherichia coli K-12 (bacteria)
#4: Chemical ChemComp-CMC / CARBOXYMETHYL COENZYME *A


Mass: 825.570 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C23H38N7O18P3S / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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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

Component
IDNameTypeEntity IDParent-IDSource
1human NatB complexCOMPLEX#1-#20MULTIPLE SOURCES
2N-alpha-acetyltransferase 20, N-alpha-acetyltransferase 25, NatB auxiliary subunitCOMPLEX#1-#21RECOMBINANT
3MDVFM peptideCOMPLEX#31RECOMBINANT
Molecular weightUnits: MEGADALTONS / Experimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
23Escherichia coli (E. coli)562
12Homo sapiens (human)9606
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
23synthetic construct (others)32630
12Spodoptera frugiperda (fall armyworm)7108
Buffer solutionpH: 7
Buffer component
IDConc.NameFormulaBuffer-ID
1200 mMsodium clorideNaClSodium chloride1
225 mM4-(2-hydroxyethyl)-1-piperazineethanesulfonic acidHepes1
31 mMDithiothreitolDTT1
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK II / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 289 K

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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 recording
IDImaging-IDElectron dose (e/Å2)Film or detector model
111.6GATAN K3 (6k x 4k)
211.3GATAN K3 (6k x 4k)

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Processing

Software
NameVersionClassificationNB
phenix.real_space_refine1.14_3260refinement
PHENIX1.14_3260refinement
EM software
IDNameVersionCategory
4CTFFINDCTF correction
7Coot0.8.9.2model fitting
9PHENIX1.17.1-3660model refinement
10RELION3initial Euler assignment
11RELION3final Euler assignment
12RELION3classification
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.46 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 982420 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
RefinementStereochemistry target values: CDL v1.2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.01088106
ELECTRON MICROSCOPYf_angle_d1.027811050
ELECTRON MICROSCOPYf_chiral_restr0.05921305
ELECTRON MICROSCOPYf_plane_restr0.00841387
ELECTRON MICROSCOPYf_dihedral_angle_d14.59024761

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