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Yorodumi- PDB-7wjd: Crystal structure of Lactococcus lactis subsp. cremoris GH31 alph... -
+Open data
-Basic information
Entry | Database: PDB / ID: 7wjd | ||||||
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Title | Crystal structure of Lactococcus lactis subsp. cremoris GH31 alpha-1,3-glucosidase mutant D394A in complex with nigerotriose | ||||||
Components | Alpha-xylosidase | ||||||
Keywords | HYDROLASE / nigerose / glucose / glycoside hydrolase / GH31 / carbohydrate / TIM-barrel / hexamer | ||||||
Function / homology | Function and homology information Hydrolases; Glycosylases; Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds / hydrolase activity, hydrolyzing O-glycosyl compounds / carbohydrate metabolic process Similarity search - Function | ||||||
Biological species | Lactococcus lactis subsp. cremoris MG1363 (lactic acid bacteria) | ||||||
Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 1.8 Å | ||||||
Authors | Ikegaya, M. / Miyazaki, T. | ||||||
Funding support | Japan, 1items
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Citation | Journal: J Biol Chem / Year: 2022 Title: Structural basis of the strict specificity of a bacterial GH31 α-1,3-glucosidase for nigerooligosaccharides. Authors: Marina Ikegaya / Toshio Moriya / Naruhiko Adachi / Masato Kawasaki / Enoch Y Park / Takatsugu Miyazaki / Abstract: Carbohydrate-active enzymes are involved in the degradation, biosynthesis, and modification of carbohydrates and vary with the diversity of carbohydrates. The glycoside hydrolase (GH) family 31 is ...Carbohydrate-active enzymes are involved in the degradation, biosynthesis, and modification of carbohydrates and vary with the diversity of carbohydrates. The glycoside hydrolase (GH) family 31 is one of the most diverse families of carbohydrate-active enzymes, containing various enzymes that act on α-glycosides. However, the function of some GH31 groups remains unknown, as their enzymatic activity is difficult to estimate due to the low amino acid sequence similarity between characterized and uncharacterized members. Here, we performed a phylogenetic analysis and discovered a protein cluster (GH31_u1) sharing low sequence similarity with the reported GH31 enzymes. Within this cluster, we showed that a GH31_u1 protein from Lactococcus lactis (LlGH31_u1) and its fungal homolog demonstrated hydrolytic activities against nigerose [α-D-Glcp-(1→3)-D-Glc]. The k/K values of LlGH31_u1 against kojibiose and maltose were 13% and 2.1% of that against nigerose, indicating that LlGH31_u1 has a higher specificity to the α-1,3 linkage of nigerose than other characterized GH31 enzymes, including eukaryotic enzymes. Furthermore, the three-dimensional structures of LlGH31_u1 determined using X-ray crystallography and cryogenic electron microscopy revealed that LlGH31_u1 forms a hexamer and has a C-terminal domain comprising four α-helices, suggesting that it contributes to hexamerization. Finally, crystal structures in complex with nigerooligosaccharides and kojibiose along with mutational analysis revealed the active site residues involved in substrate recognition in this enzyme. This study reports the first structure of a bacterial GH31 α-1,3-glucosidase and provides new insight into the substrate specificity of GH31 enzymes and the physiological functions of bacterial and fungal GH31_u1 members. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7wjd.cif.gz | 181.9 KB | Display | PDBx/mmCIF format |
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PDB format | pdb7wjd.ent.gz | 134.6 KB | Display | PDB format |
PDBx/mmJSON format | 7wjd.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/wj/7wjd ftp://data.pdbj.org/pub/pdb/validation_reports/wj/7wjd | HTTPS FTP |
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-Related structure data
Related structure data | 7wj9C 7wjaSC 7wjbC 7wjcC 7wjeC 7wjfC 7wlgC S: Starting model for refinement C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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Unit cell |
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-Components
#1: Protein | Mass: 87984.477 Da / Num. of mol.: 1 / Mutation: D394A Source method: isolated from a genetically manipulated source Source: (gene. exp.) Lactococcus lactis subsp. cremoris MG1363 (lactic acid bacteria) Strain: MG1363 / Gene: llmg_1836 / Plasmid: pET28a / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) References: UniProt: A2RM80, Hydrolases; Glycosylases; Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds | ||||
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#2: Polysaccharide | alpha-D-glucopyranose-(1-3)-alpha-D-glucopyranose-(1-3)-alpha-D-glucopyranose Source method: isolated from a genetically manipulated source | ||||
#3: Sugar | ChemComp-BGC / | ||||
#4: Chemical | #5: Water | ChemComp-HOH / | Has ligand of interest | Y | |
-Experimental details
-Experiment
Experiment | Method: X-RAY DIFFRACTION / Number of used crystals: 1 |
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-Sample preparation
Crystal | Density Matthews: 3.37 Å3/Da / Density % sol: 63.45 % |
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Crystal grow | Temperature: 293 K / Method: vapor diffusion, hanging drop / pH: 7 Details: 13% PEG 3350, 400 mM ammonium citrate buffer (pH 7.0), 10 mM nigerotriose |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: SYNCHROTRON / Site: Photon Factory / Beamline: BL-5A / Wavelength: 1 Å |
Detector | Type: DECTRIS PILATUS3 S 2M / Detector: PIXEL / Date: Jun 5, 2021 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 1 Å / Relative weight: 1 |
Reflection | Resolution: 1.8→50 Å / Num. obs: 111675 / % possible obs: 100 % / Redundancy: 19.6 % / CC1/2: 1 / Rmerge(I) obs: 0.072 / Net I/σ(I): 30.5 |
Reflection shell | Resolution: 1.8→1.9 Å / Redundancy: 20.2 % / Rmerge(I) obs: 1.505 / Mean I/σ(I) obs: 2.6 / Num. unique obs: 16068 / CC1/2: 0.841 / % possible all: 100 |
-Processing
Software |
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Refinement | Method to determine structure: MOLECULAR REPLACEMENT Starting model: 7WJA Resolution: 1.8→47.948 Å / Cor.coef. Fo:Fc: 0.97 / Cor.coef. Fo:Fc free: 0.964 / WRfactor Rfree: 0.173 / WRfactor Rwork: 0.157 / SU B: 2.236 / SU ML: 0.067 / Average fsc free: 0.9309 / Average fsc work: 0.9368 / Cross valid method: FREE R-VALUE / ESU R: 0.092 / ESU R Free: 0.088 Details: Hydrogens have been added in their riding positions
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Solvent computation | Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: BABINET MODEL PLUS MASK | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 35.264 Å2
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Refinement step | Cycle: LAST / Resolution: 1.8→47.948 Å
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Refine LS restraints |
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LS refinement shell |
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