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- PDB-7xy9: Cryo-EM structure of secondary alcohol dehydrogenases TbSADH afte... -

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Basic information

Entry
Database: PDB / ID: 7xy9
TitleCryo-EM structure of secondary alcohol dehydrogenases TbSADH after carrier-free immobilization based on weak intermolecular interactions
ComponentsNADP-dependent isopropanol dehydrogenase
KeywordsOXIDOREDUCTASE / Coordination complex / Activity / Stability / Enzyme Immobilization
Function / homology
Function and homology information


isopropanol dehydrogenase (NADP+) / isopropanol dehydrogenase (NADP+) activity / zinc ion binding
Similarity search - Function
Alcohol dehydrogenase, zinc-type, conserved site / Zinc-containing alcohol dehydrogenases signature. / Alcohol dehydrogenase-like, C-terminal / Zinc-binding dehydrogenase / Alcohol dehydrogenase, N-terminal / Alcohol dehydrogenase GroES-like domain / Polyketide synthase, enoylreductase domain / Enoylreductase / GroES-like superfamily / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
NADP-dependent isopropanol dehydrogenase
Similarity search - Component
Biological speciesThermoanaerobacter brockii (bacteria)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.12 Å
AuthorsChen, Q. / Li, X. / Yang, F. / Qu, G. / Sun, Z.T. / Wang, Y.J.
Funding support China, 2items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2019YFA0905100 China
National Natural Science Foundation of China (NSFC)21878169 and 21991102 China
CitationJournal: Nat Commun / Year: 2023
Title: Active and stable alcohol dehydrogenase-assembled hydrogels via synergistic bridging of triazoles and metal ions.
Authors: Qiang Chen / Ge Qu / Xu Li / Mingjian Feng / Fan Yang / Yanjie Li / Jincheng Li / Feifei Tong / Shiyi Song / Yujun Wang / Zhoutong Sun / Guangsheng Luo /
Abstract: Biocatalysis is increasingly replacing traditional methods of manufacturing fine chemicals due to its green, mild, and highly selective nature, but biocatalysts, such as enzymes, are generally ...Biocatalysis is increasingly replacing traditional methods of manufacturing fine chemicals due to its green, mild, and highly selective nature, but biocatalysts, such as enzymes, are generally costly, fragile, and difficult to recycle. Immobilization provides protection for the enzyme and enables its convenient reuse, which makes immobilized enzymes promising heterogeneous biocatalysts; however, their industrial applications are limited by the low specific activity and poor stability. Herein, we report a feasible strategy utilizing the synergistic bridging of triazoles and metal ions to induce the formation of porous enzyme-assembled hydrogels with increased activity. The catalytic efficiency of the prepared enzyme-assembled hydrogels toward acetophenone reduction is 6.3 times higher than that of the free enzyme, and the reusability is confirmed by the high residual catalytic activity after 12 cycles of use. A near-atomic resolution (2.1 Å) structure of the hydrogel enzyme is successfully analyzed via cryogenic electron microscopy, which indicates a structure-property relationship for the enhanced performance. In addition, the possible mechanism of gel formation is elucidated, revealing the indispensability of triazoles and metal ions, which guides the use of two other enzymes to prepare enzyme-assembled hydrogels capable of good reusability. The described strategy can pave the way for the development of practical catalytic biomaterials and immobilized biocatalysts.
History
DepositionJun 1, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 7, 2023Provider: repository / Type: Initial release
Revision 1.1Dec 20, 2023Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
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.pdbx_database_id_DOI / _citation.title / _citation.year
Revision 1.2May 8, 2024Group: Database references / Category: citation
Item: _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: NADP-dependent isopropanol dehydrogenase
B: NADP-dependent isopropanol dehydrogenase
C: NADP-dependent isopropanol dehydrogenase
D: NADP-dependent isopropanol dehydrogenase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)154,55516
Polymers154,0994
Non-polymers45612
Water10,341574
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein
NADP-dependent isopropanol dehydrogenase


Mass: 38524.695 Da / Num. of mol.: 4 / Mutation: I86N
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Thermoanaerobacter brockii (bacteria) / Gene: adh / Production host: Escherichia coli (E. coli)
References: UniProt: P14941, isopropanol dehydrogenase (NADP+)
#2: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn
#3: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: Mg
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 574 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestN

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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: enzyme assembled gel / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Thermoanaerobacter brockii (bacteria)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: 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 defocus max: 1600 nm / Nominal defocus min: 700 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: D2 (2x2 fold dihedral)
3D reconstructionResolution: 2.12 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1254312 / Symmetry type: POINT

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