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- PDB-9d30: Cryo-EM structure of mycocerosic acid synthase with a single DH-A... -

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Basic information

Entry
Database: PDB / ID: 9d30
TitleCryo-EM structure of mycocerosic acid synthase with a single DH-ACP crosslink using C16 alpha-bromoamide. Complex C
ComponentsMycocerosic acid synthase
KeywordsBIOSYNTHETIC PROTEIN / FAS / polyketide / crosslinked / dehydratase
Function / homology
Function and homology information


mycocerosate synthase activity / mycocerosate synthase / DIM/DIP cell wall layer assembly / fatty acid synthase activity / phosphopantetheine binding / 3-oxoacyl-[acyl-carrier-protein] synthase activity / fatty acid biosynthetic process / oxidoreductase activity / plasma membrane / cytoplasm
Similarity search - Function
: / Zinc-binding dehydrogenase / : / Polyketide synthase dehydratase N-terminal domain / Polyketide synthase, dehydratase domain / PKS_DH / : / Polyketide synthase dehydratase domain / : / Polyketide and metazoan fatty acid synthase dehydratase (PKS/mFAS DH) domain profile. ...: / Zinc-binding dehydrogenase / : / Polyketide synthase dehydratase N-terminal domain / Polyketide synthase, dehydratase domain / PKS_DH / : / Polyketide synthase dehydratase domain / : / Polyketide and metazoan fatty acid synthase dehydratase (PKS/mFAS DH) domain profile. / Polyketide synthase, dehydratase domain superfamily / Polyketide synthase, C-terminal extension / Ketoacyl-synthetase C-terminal extension / Polyketide synthase, ketoreductase domain / KR domain / Malonyl-CoA ACP transacylase, ACP-binding / : / Acyl transferase / Acyl transferase domain / Acyl transferase domain in polyketide synthase (PKS) enzymes. / Acyl transferase domain superfamily / Alcohol dehydrogenase, N-terminal / Alcohol dehydrogenase GroES-like domain / Polyketide synthase, enoylreductase domain / Enoylreductase / Acyl transferase/acyl hydrolase/lysophospholipase / Polyketide synthase, phosphopantetheine-binding domain / Phosphopantetheine attachment site / PKS_KR / Beta-ketoacyl synthase / Beta-ketoacyl synthase, active site / Ketosynthase family 3 (KS3) active site signature. / Ketosynthase family 3 (KS3) domain profile. / Beta-ketoacyl synthase, N-terminal / Beta-ketoacyl synthase, C-terminal / Polyketide synthase, beta-ketoacyl synthase domain / Beta-ketoacyl synthase, N-terminal domain / Beta-ketoacyl synthase, C-terminal domain / GroES-like superfamily / Thiolase-like / Phosphopantetheine attachment site / Phosphopantetheine attachment site. / Phosphopantetheine attachment site / ACP-like superfamily / Carrier protein (CP) domain profile. / Phosphopantetheine binding ACP domain / Prokaryotic membrane lipoprotein lipid attachment site profile. / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
Chem-MU4 / Mycocerosic acid synthase
Similarity search - Component
Biological speciesMycobacterium tuberculosis (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.74 Å
AuthorsHeberlig, G.W. / Jiang, Z. / Burkart, M.D.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM095970 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)K12 HL141956 United States
National Science Foundation (NSF, United States)DMR-2011924 United States
CitationJournal: Nat Commun / Year: 2025
Title: Visualizing acyl carrier protein interactions within a crosslinked type I polyketide synthase.
Authors: Ziran Jiang / Graham W Heberlig / Jeffrey A Chen / Jennifer Huynh / James J La Clair / Michael D Burkart /
Abstract: Using a combination of dual covalent crosslinking and cryo-EM analyses, we elucidate the structure of mycocerosic acid synthase from Mycobacterium tuberculosis trapped in two distinct catalytic ...Using a combination of dual covalent crosslinking and cryo-EM analyses, we elucidate the structure of mycocerosic acid synthase from Mycobacterium tuberculosis trapped in two distinct catalytic states during its iterative cycle. These structures reveal domain architecture of the acyl carrier protein mediating condensation and dehydration through dual site-selective crosslinking of the acyl carrier protein with the ketosynthase and dehydratase domains. Map density was sufficient to visualize full domain architecture with active site-bound probes and elucidate key interactions of four distinct crosslinked species. Here, iterative vectorial polyketide biosynthesis arises through an overall twisting and tilting architecture, enabling positioning and entry of the cognate substrate at each enzymatic domain. These structures present valuable details for future therapeutic design against mycocerosic acid biosynthesis in M. tuberculosis.
History
DepositionAug 9, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 13, 2025Provider: repository / Type: Initial release
Revision 1.0Aug 13, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Aug 13, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Aug 13, 2025Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 13, 2025Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Aug 13, 2025Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 13, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Sep 3, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Mycocerosic acid synthase
B: Mycocerosic acid synthase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)452,8453
Polymers452,2652
Non-polymers5801
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Mycocerosic acid synthase


Mass: 226132.672 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mycobacterium tuberculosis (bacteria)
Gene: mas, A4S10_03068, ERS035788_00558, ERS053720_02716, SAMEA2683035_02325
Production host: Escherichia coli (E. coli) / References: UniProt: A0A0E8V6Y3, mycocerosate synthase
#2: Chemical ChemComp-MU4 / N-[2-(hexadecanoylamino)ethyl]-N~3~-[(2R)-2-hydroxy-3,3-dimethyl-4-(phosphonooxy)butanoyl]-beta-alaninamide


Mass: 579.707 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C27H54N3O8P
Has ligand of interestN
Has protein modificationY

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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: Homodimeric MAS single crosslink between ACP and DH domains
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Mycobacterium tuberculosis (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
Buffer component
IDConc.NameBuffer-ID
150 mMTris HCl1
2150 mMSodium chloride1
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 277 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: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 800 nm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 55 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3135
EM imaging opticsEnergyfilter name: TFS Selectris X / Energyfilter slit width: 20 eV

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2EPUimage acquisition
4cryoSPARCCTF correction
7UCSF ChimeraXmodel fitting
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignment
11cryoSPARCfinal Euler assignment
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1055614
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.74 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 35969 / Symmetry type: POINT
Atomic model buildingAccession code: AF-Q02251-F1 / Source name: AlphaFold / Type: in silico model
RefinementCross valid method: NONE

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