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- EMDB-35453: Cryo-EM structure of ochratoxin A-detoxifying amidohydrolase ADH3... -
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Open data
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Basic information
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Title | Cryo-EM structure of ochratoxin A-detoxifying amidohydrolase ADH3 in complex with Phe | |||||||||
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![]() | amidohydrolase / octamer / ochratoxin A degradtion / cryo-EM structure / HYDROLASE | |||||||||
Function / homology | hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds / Amidohydrolase family / Metal-dependent hydrolase, composite domain superfamily / Amidohydrolase-related / Metal-dependent hydrolase / Amidohydrolase family protein![]() | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.5 Å | |||||||||
![]() | Dai LH / Niu D / Huang J-W / Li X / Shen PP / Li H / Hu YM / Yang Y / Chen C-C / Guo R-T | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structure and rational engineering of a superefficient ochratoxin A-detoxifying amidohydrolase. Authors: Longhai Dai / Du Niu / Jian-Wen Huang / Xian Li / Panpan Shen / Hao Li / Zhenzhen Xie / Jian Min / Yumei Hu / Yu Yang / Rey-Ting Guo / Chun-Chi Chen / ![]() Abstract: Ochratoxin A (OTA) is among the most prevalent mycotoxins detected in agroproducts, posing serious threats to human and livestock health. Using enzymes to conduct OTA detoxification is an appealing ...Ochratoxin A (OTA) is among the most prevalent mycotoxins detected in agroproducts, posing serious threats to human and livestock health. Using enzymes to conduct OTA detoxification is an appealing potential strategy. The recently identified amidohydrolase from Stenotrophomonas acidaminiphila, termed ADH3, is the most efficient OTA-detoxifying enzyme reported thus far and can hydrolyze OTA to nontoxic ochratoxin α (OTα) and L-β-phenylalanine (Phe). To elucidate the catalytic mechanism of ADH3, we solved the single-particle cryo-electron microscopy (cryo-EM) structures of apo-form, Phe- and OTA-bound ADH3 to an overall resolution of 2.5-2.7 Å. The role of OTA-binding residues was investigated by structural, mutagenesis and biochemical analyses. We also rationally engineered ADH3 and obtained variant S88E, whose catalytic activity was elevated by 3.7-fold. Structural analysis of variant S88E indicates that the E88 side chain provides additional hydrogen bond interactions to the OTα moiety. Furthermore, the OTA-hydrolytic activity of variant S88E expressed in Pichia pastoris is comparable to that of Escherichia coli-expressed enzyme, revealing the feasibility of employing the industrial yeast strain to produce ADH3 and its variants for further applications. These results unveil a wealth of information about the catalytic mechanism of ADH3-mediated OTA degradation and provide a blueprint for rational engineering of high-efficiency OTA-detoxifying machineries. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 167.8 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 14.7 KB 14.7 KB | Display Display | ![]() |
Images | ![]() | 141.4 KB | ||
Filedesc metadata | ![]() | 5.6 KB | ||
Others | ![]() ![]() | 165 MB 165 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8ihrMC ![]() 8ihqC ![]() 8ihsC ![]() 8j85C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 0.85 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #1
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Projections & Slices |
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Density Histograms |
-Half map: #2
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : ADH3
Entire | Name: ADH3 |
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Components |
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-Supramolecule #1: ADH3
Supramolecule | Name: ADH3 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Amidohydrolase family protein
Macromolecule | Name: Amidohydrolase family protein / type: protein_or_peptide / ID: 1 / Number of copies: 8 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 45.717617 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MPIRRRFASL LLLACAPAWA EPVAVQCGRL FDARSGQLKG PHTLLVADGR IRQVLPGTGA DAAGARVVDL GDKVCLPGWT DLHVHLGSQ SSPQSYSEDF RLDPVDHAFR AVGYAEKTLM AGFTSVRDLG GEVSPHLRDA INQGLVRGPR IFAAGKSIAT T GGHADPTN ...String: MPIRRRFASL LLLACAPAWA EPVAVQCGRL FDARSGQLKG PHTLLVADGR IRQVLPGTGA DAAGARVVDL GDKVCLPGWT DLHVHLGSQ SSPQSYSEDF RLDPVDHAFR AVGYAEKTLM AGFTSVRDLG GEVSPHLRDA INQGLVRGPR IFAAGKSIAT T GGHADPTN GWNERLAHLV GAPGPAEGVV NSVDEARQAV RQRYKEGSDL I(KCX)ITATGGVL SYARSGDAPQ FTVDEIKA V VDTARDYGFR VAAHAHGTEG MKRAVQAGVT SIEHGTYMDD EVMRLMKQHG TWYVPTFYAG RFVTEKAAID GYFPEVVRP KAARIGALIS QTAAKAYRNG VRIAFGTDQG VGPHGDNARE FVYMVEAGIP AAYALQAATV HAAQVLGVDD QGVLEPGKRA DVIALAGNP LEDINAVLDV RFVMKDGVIY KQ UniProtKB: Amidohydrolase family protein |
-Macromolecule #2: ZINC ION
Macromolecule | Name: ZINC ION / type: ligand / ID: 2 / Number of copies: 16 / Formula: ZN |
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Molecular weight | Theoretical: 65.409 Da |
-Macromolecule #3: PHENYLALANINE
Macromolecule | Name: PHENYLALANINE / type: ligand / ID: 3 / Number of copies: 8 / Formula: PHE |
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Molecular weight | Theoretical: 165.189 Da |
Chemical component information | ![]() ChemComp-PHE: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 0.6 mg/mL |
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Buffer | pH: 7.5 / Details: 20 mM Tris-HCL,pH 7.5 |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 52.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.4 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: PDB ENTRY PDB model - PDB ID: |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 234057 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |
-Atomic model buiding 1
Refinement | Space: REAL / Protocol: RIGID BODY FIT |
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Output model | ![]() PDB-8ihr: |