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- PDB-9nqj: Cryo-EM structure of a bacterial prototype ATP-binding cassette t... -

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Basic information

Entry
Database: PDB / ID: 9nqj
TitleCryo-EM structure of a bacterial prototype ATP-binding cassette transporter MalFGK2.
Components
  • (Maltose/maltodextrin transport system permease protein ...) x 2
  • Maltose/maltodextrin import ATP-binding protein MalK
KeywordsTRANSPORT PROTEIN / bacterial prototype ATP-binding cassette transporter
Function / homology
Function and homology information


ABC-type maltose transporter / ABC-type maltose transporter activity / negative regulation of maltose transport / enzyme IIA-maltose transporter complex / negative regulation of transmembrane transport / maltose transport complex / maltose transport / maltodextrin transmembrane transport / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / ATP-binding cassette (ABC) transporter complex ...ABC-type maltose transporter / ABC-type maltose transporter activity / negative regulation of maltose transport / enzyme IIA-maltose transporter complex / negative regulation of transmembrane transport / maltose transport complex / maltose transport / maltodextrin transmembrane transport / ATP-binding cassette (ABC) transporter complex, substrate-binding subunit-containing / ATP-binding cassette (ABC) transporter complex / DNA-binding transcription factor binding / DNA damage response / ATP hydrolysis activity / ATP binding / membrane / plasma membrane
Similarity search - Function
Maltose transport system permease protein MalF, P2 domain / MalF, N-terminal / : / : / Maltose transport system permease protein MalF P2 domain / MalF, N-terminal region, transmembrane helices / Maltose/Maltodextrin import ATP-binding protein malK family profile. / Transport-associated OB, type 2 / TOBE domain / : ...Maltose transport system permease protein MalF, P2 domain / MalF, N-terminal / : / : / Maltose transport system permease protein MalF P2 domain / MalF, N-terminal region, transmembrane helices / Maltose/Maltodextrin import ATP-binding protein malK family profile. / Transport-associated OB, type 2 / TOBE domain / : / ABC transporter, maltose/maltodextrin import, MalK-like / : / Molybdate/tungstate binding, C-terminal / ABC transporter type 1, transmembrane domain MetI-like / MetI-like superfamily / Binding-protein-dependent transport system inner membrane component / ABC transporter integral membrane type-1 domain profile. / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / Nucleic acid-binding, OB-fold / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
ADENOSINE-5'-DIPHOSPHATE / VANADATE ION / Maltose/maltodextrin transport system permease protein MalF / Maltose/maltodextrin transport system permease protein MalG / Maltose/maltodextrin import ATP-binding protein MalK
Similarity search - Component
Biological speciesEscherichia coli K-12 (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.34 Å
AuthorsQian, R. / Jing, W. / Vinay, I. / Shanwen, Z. / Jeehae, S. / William, G.L. / Luis, M.R.H. / Jong, H.S. / Young, A.G. / IIya, L. ...Qian, R. / Jing, W. / Vinay, I. / Shanwen, Z. / Jeehae, S. / William, G.L. / Luis, M.R.H. / Jong, H.S. / Young, A.G. / IIya, L. / Kirill, M. / Baron, C. / Huan, B.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)DP2GM140920 United States
CitationJournal: Nat Commun / Year: 2025
Title: DeFrND: detergent-free reconstitution into native nanodiscs with designer membrane scaffold peptides.
Authors: Qian Ren / Jing Wang / Vinay Idikuda / Shanwen Zhang / Jeehae Shin / W Grant Ludlam / Luis M Real Hernandez / Sara Zdancewicz / Alex J B Kreutzberger / Hucheng Chang / Volker Kiessling / ...Authors: Qian Ren / Jing Wang / Vinay Idikuda / Shanwen Zhang / Jeehae Shin / W Grant Ludlam / Luis M Real Hernandez / Sara Zdancewicz / Alex J B Kreutzberger / Hucheng Chang / Volker Kiessling / Lukas K Tamm / Ahmad Jomaa / Ilya Levental / Kirill Martemyanov / Baron Chanda / Huan Bao /
Abstract: Membrane scaffold protein-based nanodiscs have facilitated unprecedented structural and biophysical analysis of membrane proteins in a near-native lipid environment. However, successful ...Membrane scaffold protein-based nanodiscs have facilitated unprecedented structural and biophysical analysis of membrane proteins in a near-native lipid environment. However, successful reconstitution of membrane proteins in nanodiscs requires prior solubilization and purification in detergents, which may impact their physiological structure and function. Furthermore, the detergent-mediated reconstitution of nanodiscs is unlikely to recapitulate the precise composition or asymmetry of native membranes. To circumvent this fundamental limitation of traditional nanodisc technology, we herein describe the development of membrane-solubilizing peptides to directly extract membrane proteins from native cell membranes into nanoscale discoids. By systematically protein engineering and screening, we create a class of chemically modified Apolipoprotein-A1 mimetic peptides to enable the formation of detergent-free nanodiscs with high efficiency. Nanodiscs generated with these engineered membrane scaffold peptides are suitable for obtaining high-resolution structures using single-particle cryo-EM with native lipids. To further highlight the versatility of our approach, we directly extract a sampling of membrane signaling proteins with their surrounding native membranes for biochemical and biophysical interrogations.
History
DepositionMar 12, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 24, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Maltose/maltodextrin import ATP-binding protein MalK
B: Maltose/maltodextrin import ATP-binding protein MalK
F: Maltose/maltodextrin transport system permease protein MalF
G: Maltose/maltodextrin transport system permease protein MalG
hetero molecules


Theoretical massNumber of molelcules
Total (without water)172,39010
Polymers171,2584
Non-polymers1,1336
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 1 types, 2 molecules AB

#1: Protein Maltose/maltodextrin import ATP-binding protein MalK


Mass: 40979.234 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli K-12 (bacteria) / Gene: malK, b4035, JW3995 / Production host: Escherichia coli (E. coli) / References: UniProt: P68187, ABC-type maltose transporter

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Maltose/maltodextrin transport system permease protein ... , 2 types, 2 molecules FG

#2: Protein Maltose/maltodextrin transport system permease protein MalF


Mass: 57052.898 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli K-12 (bacteria) / Gene: malF, b4033, JW3993 / Production host: Escherichia coli (E. coli) / References: UniProt: P02916
#3: Protein Maltose/maltodextrin transport system permease protein MalG


Mass: 32246.227 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli K-12 (bacteria) / Gene: malG, b4032, JW3992 / Production host: Escherichia coli (E. coli) / References: UniProt: P68183

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Non-polymers , 3 types, 6 molecules

#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-ADP / ADENOSINE-5'-DIPHOSPHATE


Mass: 427.201 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H15N5O10P2 / Feature type: SUBJECT OF INVESTIGATION / Comment: ADP, energy-carrying molecule*YM
#6: Chemical ChemComp-VO4 / VANADATE ION


Mass: 114.939 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: VO4 / Feature type: SUBJECT OF INVESTIGATION

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Details

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: ATP-binding cassette transporter MalFGK2 / Type: COMPLEX / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightValue: 0.25 MDa / Experimental value: YES
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in.
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 283.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2700 nm / Nominal defocus min: 300 nm
Image recordingElectron dose: 1.172 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.2_4487 / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.34 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 125454 / Symmetry type: POINT

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