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- EMDB-21307: Cryo-EM structure of human NatB complex -

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Basic information

Entry
Database: EMDB / ID: EMD-21307
TitleCryo-EM structure of human NatB complex
Map dataNatB complex
Sample
  • Complex: human NatB complex
    • Complex: N-alpha-acetyltransferase 20, N-alpha-acetyltransferase 25, NatB auxiliary subunit
      • Protein or peptide: N-alpha-acetyltransferase 20
      • Protein or peptide: N-alpha-acetyltransferase 25, NatB auxiliary subunit
    • Complex: MDVFM peptide
      • Protein or peptide: MDVFM peptide
  • Ligand: CARBOXYMETHYL COENZYME *A
KeywordsNatB / NAA20 / NAA25 / TRANSFERASE
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
N-alpha-acetyltransferase 20 / N-alpha-acetyltransferase 25, NatB auxiliary subunit
Similarity search - Component
Biological speciesHomo sapiens (human) / Escherichia coli (E. coli) / Escherichia coli K-12 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.46 Å
AuthorsDeng S / Marmorstein R
Funding support United States, 1 items
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, 2020-
Header (metadata) releaseSep 23, 2020-
Map releaseSep 23, 2020-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6vp9
  • Surface level: 0.015
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21307.png

Downloads & links

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Map

FileDownload / File: emd_21307.map.gz / Format: CCP4 / Size: 40.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationNatB complex
Voxel sizeX=Y=Z: 0.83 Å
Density
Contour LevelBy AUTHOR: 0.015 / Movie #1: 0.015
Minimum - Maximum-0.111868426 - 0.16999745
Average (Standard dev.)0.0002937734 (±0.005049073)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-110-110-110
Dimensions220220220
Spacing220220220
CellA=B=C: 182.59999 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.830.830.83
M x/y/z220220220
origin x/y/z0.0000.0000.000
length x/y/z182.600182.600182.600
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ428428428
MAP C/R/S123
start NC/NR/NS-110-110-110
NC/NR/NS220220220
D min/max/mean-0.1120.1700.000

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Supplemental data

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Sample components

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Entire : human NatB complex

EntireName: human NatB complex
Components
  • Complex: human NatB complex
    • Complex: N-alpha-acetyltransferase 20, N-alpha-acetyltransferase 25, NatB auxiliary subunit
      • Protein or peptide: N-alpha-acetyltransferase 20
      • Protein or peptide: N-alpha-acetyltransferase 25, NatB auxiliary subunit
    • Complex: MDVFM peptide
      • Protein or peptide: MDVFM peptide
  • Ligand: CARBOXYMETHYL COENZYME *A

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Supramolecule #1: human NatB complex

SupramoleculeName: human NatB complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2

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Supramolecule #2: N-alpha-acetyltransferase 20, N-alpha-acetyltransferase 25, NatB ...

SupramoleculeName: N-alpha-acetyltransferase 20, N-alpha-acetyltransferase 25, NatB auxiliary subunit
type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: MDVFM peptide

SupramoleculeName: MDVFM peptide / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #3
Source (natural)Organism: Escherichia coli (E. coli)

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Macromolecule #1: N-alpha-acetyltransferase 20

MacromoleculeName: N-alpha-acetyltransferase 20 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
EC number: N-terminal methionine Nalpha-acetyltransferase NatB
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 18.694168 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MTTLRAFTCD DLFRFNNINL DPLTETYGIP FYLQYLAHWP EYFIVAEAPG GELMGYIMGK AEGSVAREEW HGHVTALSVA PEFRRLGLA AKLMELLEEI SERKGGFFVD LFVRVSNQVA VNMYKQLGYS VYRTVIEYYS ASNGEPDEDA YDMRKALSRD T EKK

UniProtKB: N-alpha-acetyltransferase 20

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Macromolecule #2: N-alpha-acetyltransferase 25, NatB auxiliary subunit

MacromoleculeName: N-alpha-acetyltransferase 25, NatB auxiliary subunit / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 112.444258 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MATRGHVQDP NDRRLRPIYD YLDNGNNKMA IQQADKLLKK HKDLHCAKVL KAIGLQRTGK QEEAFTLAQE VAALEPTDDN SLQALTILY REMHRPELVT KLYEAAVKKV PNSEEYHSHL FMAYARVGEY KKMQQAGMAL YKIVPKNPYY FWSVMSLIMQ S ISAQDENL ...String:
MATRGHVQDP NDRRLRPIYD YLDNGNNKMA IQQADKLLKK HKDLHCAKVL KAIGLQRTGK QEEAFTLAQE VAALEPTDDN SLQALTILY REMHRPELVT KLYEAAVKKV PNSEEYHSHL FMAYARVGEY KKMQQAGMAL YKIVPKNPYY FWSVMSLIMQ S ISAQDENL SKTMFLPLAE RMVEKMVKED KIEAEAEVEL YYMILERLGK YQEALDVIRG KLGEKLTSEI QSRENKCMAM YK KLSRWPE CNALSRRLLL KNSDDWQFYL TYFDSVFRLI EEAWSPPAEG EHSLEGEVHY SAEKAVKFIE DRITEESKSS RHL RGPHLA KLELIRRLRS QGCNDEYKLG DPEELMFQYF KKFGDKPCCF TDLKVFVDLL PATQCTKFIN QLLGVVPLST PTED KLALP ADIRALQQHL CVVQLTRLLG LYHTMDKNQK LSVVRELMLR YQHGLEFGKT CLKTELQFSD YYCLLAVHAL IDVWR ETGD ETTVWQALTL LEEGLTHSPS NAQFKLLLVR IYCMLGAFEP VVDLYSSLDA KHIQHDTIGY LLTRYAESLG QYAAAS QSC NFALRFFHSN QKDTSEYIIQ AYKYGAFEKI PEFIAFRNRL NNSLHFAQVR TERMLLDLLL EANISTSLAE SIKSMNL RP EEDDIPWEDL RDNRDLNVFF SWDPKDRDVS EEHKKLSLEE ETLWLRIRSL TLRLISGLPS LNHPVEPKNS EKTAENGV S SRIDILRLLL QQLEATLETG KRFIEKDIQY PFLGPVPTRM GGFFNSGCSQ CQISSFYLVN DIYELDTSGL EDTMEIQER IENSFKSLLD QLKDVFSKCK GDLLEVKDGN LKTHPTLLEN LVFFVETISV ILWVSSYCES VLRPYKLNLQ KKKKKKKETS IIMPPVFTS FQDYVTGLQT LISNVVDHIK GLETHLIALK LEELILEDTS LSPEERKFSK TVQGKVQSSY LHSLLEMGEL L KKRLETTK KLKI

UniProtKB: N-alpha-acetyltransferase 25, NatB auxiliary subunit

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Macromolecule #3: MDVFM peptide

MacromoleculeName: MDVFM peptide / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 641.799 Da
SequenceString:
MDVFM

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Macromolecule #4: CARBOXYMETHYL COENZYME *A

MacromoleculeName: CARBOXYMETHYL COENZYME *A / type: ligand / ID: 4 / Number of copies: 1 / Formula: CMC
Molecular weightTheoretical: 825.57 Da
Chemical component information

ChemComp-CMC:
CARBOXYMETHYL COENZYME *A

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration1.0 mg/mL
BufferpH: 7
Component:
ConcentrationFormulaName
200.0 mMNaClSodium chloridesodium cloride
25.0 mMHepes4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid
1.0 mMDTTDithiothreitol
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 289 K / Instrument: FEI VITROBOT MARK II

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy
Image recording#0 - Image recording ID: 1 / #0 - Film or detector model: GATAN K3 (6k x 4k) / #0 - Average electron dose: 1.6 e/Å2 / #1 - Image recording ID: 2 / #1 - Film or detector model: GATAN K3 (6k x 4k) / #1 - Average electron dose: 1.3 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.46 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 982420
Image recording ID1

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: AB INITIO MODEL
Output model

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

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