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- PDB-8wyu: Open Falcilysin, from MK-4815-treated dataset -

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Open data


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Basic information

Entry
Database: PDB / ID: 8wyu
TitleOpen Falcilysin, from MK-4815-treated dataset
ComponentsFalcilysin
KeywordsHYDROLASE / falcilysin open conformation
Function / homology
Function and homology information


hemoglobin catabolic process / apicoplast / food vacuole / Hydrolases; Acting on peptide bonds (peptidases); Metalloendopeptidases / vacuolar membrane / protein processing / metalloendopeptidase activity / metal ion binding
Similarity search - Function
: / Peptidase M16C associated / Peptidase M16C associated / PreP C-terminal domain / Peptidase M16C associated / Peptidase M16, C-terminal / Peptidase M16 inactive domain / Peptidase M16, N-terminal / Insulinase (Peptidase family M16) / Metalloenzyme, LuxS/M16 peptidase-like
Similarity search - Domain/homology
Biological speciesPlasmodium falciparum 3D7 (eukaryote)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsLin, J.Q. / Yan, X.F. / Lescar, J.
Funding support Singapore, 1items
OrganizationGrant numberCountry
Not funded Singapore
CitationJournal: Commun Biol / Year: 2024
Title: Inhibition of falcilysin from Plasmodium falciparum by interference with its closed-to-open dynamic transition.
Authors: Jianqing Lin / Xinfu Yan / Zara Chung / Chong Wai Liew / Abbas El Sahili / Evgeniya V Pechnikova / Peter R Preiser / Zbynek Bozdech / Yong-Gui Gao / Julien Lescar /
Abstract: In the absence of an efficacious vaccine, chemotherapy remains crucial to prevent and treat malaria. Given its key role in haemoglobin degradation, falcilysin constitutes an attractive target. Here, ...In the absence of an efficacious vaccine, chemotherapy remains crucial to prevent and treat malaria. Given its key role in haemoglobin degradation, falcilysin constitutes an attractive target. Here, we reveal the mechanism of enzymatic inhibition of falcilysin by MK-4815, an investigational new drug with potent antimalarial activity. Using X-ray crystallography, we determine two binary complexes of falcilysin in a closed state, bound with peptide substrates from the haemoglobin α and β chains respectively. An antiparallel β-sheet is formed between the substrate and enzyme, accounting for sequence-independent recognition at positions P2 and P1. In contrast, numerous contacts favor tyrosine and phenylalanine at the P1' position of the substrate. Cryo-EM studies reveal a majority of unbound falcilysin molecules adopting an open conformation. Addition of MK-4815 shifts about two-thirds of falcilysin molecules to a closed state. These structures give atomic level pictures of the proteolytic cycle, in which falcilysin interconverts between a closed state conducive to proteolysis, and an open conformation amenable to substrate diffusion and products release. MK-4815 and quinolines bind to an allosteric pocket next to a hinge region of falcilysin and hinders this dynamic transition. These data should inform the design of potent inhibitors of falcilysin to combat malaria.
History
DepositionOct 31, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Aug 7, 2024Provider: repository / Type: Initial release
Revision 1.1Feb 19, 2025Group: Data collection / Database references / Structure summary
Category: citation / citation_author ...citation / citation_author / em_admin / pdbx_entry_details
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 / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Falcilysin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)132,1002
Polymers132,0341
Non-polymers651
Water00
1


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

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Components

#1: Protein Falcilysin


Mass: 132034.156 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Plasmodium falciparum 3D7 (eukaryote) / Gene: FLN / Production host: Escherichia coli (E. coli) / References: UniProt: Q76NL8
#2: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationN

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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: Falcilysin / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Plasmodium falciparum 3D7 (eukaryote)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5 / Details: 20 mM Na HEPES, 300 mM NaCl, 0.5 mM TCEP, pH 7.5
SpecimenConc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE / Humidity: 100 %

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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 defocus max: 2500 nm / Nominal defocus min: 500 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21.1_5286 / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 45566 / Symmetry type: POINT
RefinementCross valid method: NONE

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