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- PDB-8cuy: ACP1-KS-AT domains of mycobacterial Pks13 -

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Basic information

Entry
Database: PDB / ID: 8cuy
TitleACP1-KS-AT domains of mycobacterial Pks13
ComponentsPolyketide synthase PKS13
KeywordsBIOSYNTHETIC PROTEIN / mycolic acid synthesis / acyl carrier protein / ketosynthase / acyltransferase / multi-domain assembly
Function / homology
Function and homology information


6-deoxyerythronolide-B synthase / erythronolide synthase activity / biosynthetic process / phosphopantetheine binding
Similarity search - Function
: / Thioesterase / Thioesterase domain / Polyketide synthase, C-terminal extension / Ketoacyl-synthetase C-terminal extension / Malonyl-CoA ACP transacylase, ACP-binding / : / Acyl transferase / Acyl transferase domain / Acyl transferase domain in polyketide synthase (PKS) enzymes. ...: / Thioesterase / Thioesterase domain / Polyketide synthase, C-terminal extension / Ketoacyl-synthetase C-terminal extension / Malonyl-CoA ACP transacylase, ACP-binding / : / Acyl transferase / Acyl transferase domain / Acyl transferase domain in polyketide synthase (PKS) enzymes. / Acyl transferase domain superfamily / Acyl transferase/acyl hydrolase/lysophospholipase / Polyketide synthase, phosphopantetheine-binding domain / Phosphopantetheine attachment site / Beta-ketoacyl synthase / 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 / Thiolase-like / Phosphopantetheine attachment site / ACP-like superfamily / Carrier protein (CP) domain profile. / Phosphopantetheine binding ACP domain / Alpha/Beta hydrolase fold
Similarity search - Domain/homology
4'-PHOSPHOPANTETHEINE / Unknown ligand / Polyketide synthase PKS13
Similarity search - Component
Biological speciesMycolicibacterium smegmatis MC2 155 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.4 Å
AuthorsKim, S.K. / Dickinson, M.S. / Finer-Moore, J.S. / Rosenberg, O.S. / Stroud, R.M.
Funding support United States, 3items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)P01 AI095208 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01 AI128214 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM24485 United States
CitationJournal: Nat Struct Mol Biol / Year: 2023
Title: Structure and dynamics of the essential endogenous mycobacterial polyketide synthase Pks13.
Authors: Sun Kyung Kim / Miles Sasha Dickinson / Janet Finer-Moore / Ziqiang Guan / Robyn M Kaake / Ignacia Echeverria / Jen Chen / Ernst H Pulido / Andrej Sali / Nevan J Krogan / Oren S Rosenberg / Robert M Stroud /
Abstract: The mycolic acid layer of the Mycobacterium tuberculosis cell wall is essential for viability and virulence, and the enzymes responsible for its synthesis are targets for antimycobacterial drug ...The mycolic acid layer of the Mycobacterium tuberculosis cell wall is essential for viability and virulence, and the enzymes responsible for its synthesis are targets for antimycobacterial drug development. Polyketide synthase 13 (Pks13) is a module encoding several enzymatic and transport functions that carries out the condensation of two different long-chain fatty acids to produce mycolic acids. We determined structures by cryogenic-electron microscopy of dimeric multi-enzyme Pks13 purified from mycobacteria under normal growth conditions, captured with native substrates. Structures define the ketosynthase (KS), linker and acyl transferase (AT) domains at 1.8 Å resolution and two alternative locations of the N-terminal acyl carrier protein. These structures suggest intermediate states on the pathway for substrate delivery to the KS domain. Other domains, visible at lower resolution, are flexible relative to the KS-AT core. The chemical structures of three bound endogenous long-chain fatty acid substrates were determined by electrospray ionization mass spectrometry.
History
DepositionMay 17, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 15, 2023Provider: repository / Type: Initial release
Revision 1.1Mar 1, 2023Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Mar 29, 2023Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Polyketide synthase PKS13
B: Polyketide synthase PKS13
hetero molecules


Theoretical massNumber of molelcules
Total (without water)390,9457
Polymers389,3362
Non-polymers1,6085
Water1,874104
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Polyketide synthase PKS13


Mass: 194668.203 Da / Num. of mol.: 2
Fragment: The gene for Mycobacterium smegmatis polyketide synthase 13 (Pks13) was tagged with TEV-cleavable GFP at its C-terminus and purified from its natural source with anti-GFP nanobody beads. ...Fragment: The gene for Mycobacterium smegmatis polyketide synthase 13 (Pks13) was tagged with TEV-cleavable GFP at its C-terminus and purified from its natural source with anti-GFP nanobody beads. GFP was cleaved to yield the full-length Pks13.
Source method: isolated from a natural source
Details: The gene for Mycobacterium smegmatis polyketide synthase 13 (Pks13) was tagged with TEV-cleavable GFP at its C-terminus and purified from its natural source with anti-GFP nanobody beads. GFP ...Details: The gene for Mycobacterium smegmatis polyketide synthase 13 (Pks13) was tagged with TEV-cleavable GFP at its C-terminus and purified from its natural source with anti-GFP nanobody beads. GFP was cleaved to yield the full-length Pks13.
Source: (natural) Mycolicibacterium smegmatis MC2 155 (bacteria)
Strain: ATCC 700084 / mc(2)155
References: UniProt: I7FMV0, 6-deoxyerythronolide-B synthase
#2: Chemical
ChemComp-UNL / UNKNOWN LIGAND


Mass: 312.530 Da / Num. of mol.: 4 / Source method: obtained synthetically
Details: The fatty acid ligands deposited as DCR and XPM are designated as UNLs (unknown ligands). DCR is a mixture of C55H106O2 and C40H78O2, and XPM is C24H48O2.
Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-PNS / 4'-PHOSPHOPANTETHEINE


Mass: 358.348 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C11H23N2O7PS / Feature type: SUBJECT OF INVESTIGATION
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 104 / Source method: isolated from a natural source / Formula: H2O
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

ComponentName: Mycobacterial polyketide synthase 13 / Type: COMPLEX
Details: The gene for Mycobacterium smegmatis polyketide synthase 13 (Pks13) was tagged with TEV-cleavable GFP at its C-terminus and purified from its natural source with anti-GFP nanobody beads. GFP ...Details: The gene for Mycobacterium smegmatis polyketide synthase 13 (Pks13) was tagged with TEV-cleavable GFP at its C-terminus and purified from its natural source with anti-GFP nanobody beads. GFP was cleaved to yield the full-length Pks13.
Entity ID: #1 / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameBuffer-ID
150 mMTris1
2150 mMNaCl1
SpecimenConc.: 1.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 283.15 K
Details: Full length pks13 was concentrated to 1.5 mg mL-1 for cryo-EM grid preparation. 4.5 uL of sample was applied to freshly glow discharged holey carbon on gold R1.2/1.3 300 mesh Quantifoil ...Details: Full length pks13 was concentrated to 1.5 mg mL-1 for cryo-EM grid preparation. 4.5 uL of sample was applied to freshly glow discharged holey carbon on gold R1.2/1.3 300 mesh Quantifoil grids and blotted for 9 s with Whatman 1 filter paper at max humidity and 10oC in a FEI Mark IV Vitrobot, before vitrification in liquid nitrogen-cooled liquid 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 FIELD / Nominal magnification: 105000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 700 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 5.9 sec. / Electron dose: 45.8 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of real images: 7567

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM software
IDNameVersionCategoryDetails
1cryoSPARC2.12particle selection
2SerialEMimage acquisition
4cryoSPARC2.12CTF correction
7Coot0.8.9.2model fitting
9ISOLDEmodel refinementapplication in ChimeraX
10PHENIX1.19.2model refinement
11cryoSPARC2.12initial Euler assignment
12cryoSPARC2.12final Euler assignment
13RELION3classification
14RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 4400000
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 146928 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00115133
ELECTRON MICROSCOPYf_angle_d0.3620527
ELECTRON MICROSCOPYf_dihedral_angle_d8.9125536
ELECTRON MICROSCOPYf_chiral_restr0.0382293
ELECTRON MICROSCOPYf_plane_restr0.0032714

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