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- PDB-8d5b: Crystal structure of human METTL1 in complex with SAH -

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Basic information

Entry
Database: PDB / ID: 8d5b
TitleCrystal structure of human METTL1 in complex with SAH
ComponentstRNA (guanine-N(7)-)-methyltransferase
KeywordsTRANSFERASE / Cancer protein
Function / homology
Function and homology information


internal mRNA (guanine-N7-)-methyltransferase activity / tRNA stabilization / tRNA (m7G46) methyltransferase complex / tRNA (guanine-N7)-methylation / RNA (guanine-N7)-methylation / tRNA (guanine46-N7)-methyltransferase / tRNA (guanine(46)-N7)-methyltransferase activity / tRNA methyltransferase complex / tRNA modification in the nucleus and cytosol / tRNA modification ...internal mRNA (guanine-N7-)-methyltransferase activity / tRNA stabilization / tRNA (m7G46) methyltransferase complex / tRNA (guanine-N7)-methylation / RNA (guanine-N7)-methylation / tRNA (guanine46-N7)-methyltransferase / tRNA (guanine(46)-N7)-methyltransferase activity / tRNA methyltransferase complex / tRNA modification in the nucleus and cytosol / tRNA modification / tRNA methylation / Transferases; Transferring one-carbon groups; Methyltransferases / tRNA binding / nucleolus / nucleoplasm / nucleus / cytosol
Similarity search - Function
tRNA (guanine-N-7) methyltransferase catalytic subunit Trm8, eukaryote / SAM-dependent methyltransferase TRMB-type domain profile. / tRNA (guanine-N-7) methyltransferase, Trmb type / Putative methyltransferase / S-adenosyl-L-methionine-dependent methyltransferase superfamily
Similarity search - Domain/homology
CACODYLATE ION / S-ADENOSYL-L-HOMOCYSTEINE / tRNA (guanine-N(7)-)-methyltransferase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 1.93 Å
AuthorsRaj, R. / Babu, K. / Nam, Y.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM122960 United States
Cancer Prevention and Research Institute of Texas (CPRIT)RP190259 United States
Welch FoundationI-2115-20220331 United States
CitationJournal: Nature / Year: 2023
Title: Structures and mechanisms of tRNA methylation by METTL1-WDR4.
Authors: Victor M Ruiz-Arroyo / Rishi Raj / Kesavan Babu / Otgonbileg Onolbaatar / Paul H Roberts / Yunsun Nam /
Abstract: Specific, regulated modification of RNAs is important for proper gene expression. tRNAs are rich with various chemical modifications that affect their stability and function. 7-Methylguanosine (mG) ...Specific, regulated modification of RNAs is important for proper gene expression. tRNAs are rich with various chemical modifications that affect their stability and function. 7-Methylguanosine (mG) at tRNA position 46 is a conserved modification that modulates steady-state tRNA levels to affect cell growth. The METTL1-WDR4 complex generates mG46 in humans, and dysregulation of METTL1-WDR4 has been linked to brain malformation and multiple cancers. Here we show how METTL1 and WDR4 cooperate to recognize RNA substrates and catalyse methylation. A crystal structure of METTL1-WDR4 and cryo-electron microscopy structures of METTL1-WDR4-tRNA show that the composite protein surface recognizes the tRNA elbow through shape complementarity. The cryo-electron microscopy structures of METTL1-WDR4-tRNA with S-adenosylmethionine or S-adenosylhomocysteine along with METTL1 crystal structures provide additional insights into the catalytic mechanism by revealing the active site in multiple states. The METTL1 N terminus couples cofactor binding with conformational changes in the tRNA, the catalytic loop and the WDR4 C terminus, acting as the switch to activate mG methylation. Thus, our structural models explain how post-translational modifications of the METTL1 N terminus can regulate methylation. Together, our work elucidates the core and regulatory mechanisms underlying mG modification by METTL1, providing the framework to understand its contribution to biology and disease.
History
DepositionJun 4, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 11, 2023Provider: repository / Type: Initial release
Revision 1.1Jan 25, 2023Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.2Oct 25, 2023Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond / pdbx_initial_refinement_model

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: tRNA (guanine-N(7)-)-methyltransferase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)31,3468
Polymers30,4131
Non-polymers9337
Water2,594144
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
MethodPISA
Unit cell
Length a, b, c (Å)86.034, 86.034, 65.483
Angle α, β, γ (deg.)90.000, 90.000, 120.000
Int Tables number169
Space group name H-MP61
Space group name HallP61
Symmetry operation#1: x,y,z
#2: x-y,x,z+1/6
#3: y,-x+y,z+5/6
#4: -y,x-y,z+1/3
#5: -x+y,-x,z+2/3
#6: -x,-y,z+1/2

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Components

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Protein , 1 types, 1 molecules A

#1: Protein tRNA (guanine-N(7)-)-methyltransferase / Methyltransferase-like protein 1 / mRNA (guanine-N(7)-)-methyltransferase / miRNA (guanine-N(7)-)- ...Methyltransferase-like protein 1 / mRNA (guanine-N(7)-)-methyltransferase / miRNA (guanine-N(7)-)-methyltransferase / tRNA (guanine(46)-N(7))-methyltransferase / tRNA(m7G46)-methyltransferase


Mass: 30412.713 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: METTL1, C12orf1 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): Rosetta
References: UniProt: Q9UBP6, tRNA (guanine46-N7)-methyltransferase, Transferases; Transferring one-carbon groups; Methyltransferases

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Non-polymers , 6 types, 151 molecules

#2: Chemical ChemComp-SAH / S-ADENOSYL-L-HOMOCYSTEINE / S-Adenosyl-L-homocysteine


Type: L-peptide linking / Mass: 384.411 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C14H20N6O5S / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-SO4 / SULFATE ION / Sulfate


Mass: 96.063 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: SO4
#4: Chemical ChemComp-GOL / GLYCEROL / GLYCERIN / PROPANE-1,2,3-TRIOL / Glycerol


Mass: 92.094 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Formula: C3H8O3
#5: Chemical ChemComp-CL / CHLORIDE ION / Chloride


Mass: 35.453 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Cl
#6: Chemical ChemComp-CAC / CACODYLATE ION / dimethylarsinate / Cacodylic acid


Mass: 136.989 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: C2H6AsO2
#7: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 144 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 2.46 Å3/Da / Density % sol: 49.97 %
Crystal growTemperature: 295.15 K / Method: vapor diffusion, hanging drop
Details: 50 mM Sodium cacodylate pH 5.7, 1.5 M Lithium sulfate, 10 mM Magnesium sulfate

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Data collection

DiffractionMean temperature: 100 K / Serial crystal experiment: N
Diffraction sourceSource: SYNCHROTRON / Site: APS / Beamline: 19-ID / Wavelength: 0.9789 Å
DetectorType: DECTRIS PILATUS3 6M / Detector: PIXEL / Date: Dec 2, 2020
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 0.9789 Å / Relative weight: 1
ReflectionResolution: 1.93→37.25 Å / Num. obs: 20856 / % possible obs: 100 % / Redundancy: 18.1 % / Biso Wilson estimate: 32.6 Å2 / CC1/2: 0.996 / Rmerge(I) obs: 0.242 / Rpim(I) all: 0.057 / Net I/σ(I): 16.24
Reflection shellResolution: 1.93→1.96 Å / Redundancy: 10.5 % / Rmerge(I) obs: 3.22 / Mean I/σ(I) obs: 1.3 / Num. unique obs: 1034 / CC1/2: 0.45 / Rpim(I) all: 1.03 / % possible all: 99.9

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Processing

Software
NameVersionClassification
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing
PHENIX1.20.1_4487refinement
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: 3CKK

3ckk


Resolution: 1.93→37.25 Å / SU ML: 0.2564 / Cross valid method: FREE R-VALUE / σ(F): 1.35 / Phase error: 24.2094
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
RfactorNum. reflection% reflection
Rfree0.2122 987 4.76 %
Rwork0.1808 19769 -
obs0.1823 20756 99.65 %
Solvent computationShrinkage radii: 0.9 Å / VDW probe radii: 1.1 Å / Solvent model: FLAT BULK SOLVENT MODEL
Displacement parametersBiso mean: 36.9 Å2
Refinement stepCycle: LAST / Resolution: 1.93→37.25 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1577 0 54 144 1775
Refine LS restraints
Refine-IDTypeDev idealNumber
X-RAY DIFFRACTIONf_bond_d0.00631689
X-RAY DIFFRACTIONf_angle_d0.95052297
X-RAY DIFFRACTIONf_chiral_restr0.0571250
X-RAY DIFFRACTIONf_plane_restr0.007291
X-RAY DIFFRACTIONf_dihedral_angle_d12.0873619
LS refinement shell
Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRefine-ID% reflection obs (%)
1.93-2.030.31521400.25362780X-RAY DIFFRACTION99.12
2.03-2.160.26021450.20382810X-RAY DIFFRACTION99.26
2.16-2.330.23251380.19252801X-RAY DIFFRACTION99.59
2.33-2.560.19141200.19082830X-RAY DIFFRACTION99.7
2.56-2.930.23271520.20632824X-RAY DIFFRACTION99.87
2.93-3.690.20161590.17392827X-RAY DIFFRACTION100
3.69-37.250.19191330.15962897X-RAY DIFFRACTION100

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