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- PDB-8hi5: Crystal structure of the NADP+ and MSA bound C terminal domain of... -
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Basic information
Entry | Database: PDB / ID: 8hi5 | ||||||
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Title | Crystal structure of the NADP+ and MSA bound C terminal domain of bi-functional malonyl-CoA reductase from Roseiflexus castenholzii | ||||||
![]() | Short-chain dehydrogenase/reductase SDR | ||||||
![]() | OXIDOREDUCTASE / The 3-hydroxypropionate cycle / Short chain dehydrogenase | ||||||
Function / homology | oxidoreductase activity, acting on the CH-OH group of donors, NAD or NADP as acceptor / short chain dehydrogenase / PKS_KR / Short-chain dehydrogenase/reductase SDR / NAD(P)-binding domain superfamily / nucleotide binding / 3-oxidanylidenepropanoic acid / NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE / Short-chain dehydrogenase/reductase SDR![]() | ||||||
Biological species | ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Zhang, X. / Wu, W.P. / Xu, X. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis of a bi-functional malonyl-CoA reductase (MCR) from the photosynthetic green non-sulfur bacterium . Authors: Xin Zhang / Jiyu Xin / Zhiguo Wang / Wenping Wu / Yutong Liu / Zhenzhen Min / Yueyong Xin / Bing Liu / Jun He / Xingwei Zhang / Xiaoling Xu / ![]() Abstract: Malonyl-CoA reductase (MCR) is a NADPH-dependent bi-functional enzyme that performs alcohol dehydrogenase and aldehyde dehydrogenase (CoA-acylating) activities in the N- and C-terminal fragments, ...Malonyl-CoA reductase (MCR) is a NADPH-dependent bi-functional enzyme that performs alcohol dehydrogenase and aldehyde dehydrogenase (CoA-acylating) activities in the N- and C-terminal fragments, respectively. It catalyzes the two-step reduction of malonyl-CoA to 3-hydroxypropionate (3-HP), a key reaction in the autotrophic CO fixation cycles of green non-sulfur bacteria and the archaea . However, the structural basis underlying substrate selection, coordination, and the subsequent catalytic reactions of full-length MCR is largely unknown. For the first time, we here determined the structure of full-length MCR from the photosynthetic green non-sulfur bacterium (MCR) at 3.35 Å resolution. Furthermore, we determined the crystal structures of the N- and C-terminal fragments bound with reaction intermediates NADP and malonate semialdehyde (MSA) at 2.0 Å and 2.3 Å, respectively, and elucidated the catalytic mechanisms using a combination of molecular dynamics simulations and enzymatic analyses. Full-length MCR was a homodimer of two cross-interlocked subunits, each containing four tandemly arranged short-chain dehydrogenase/reductase (SDR) domains. Only the catalytic domains SDR1 and SDR3 incorporated additional secondary structures that changed with NADP-MSA binding. The substrate, malonyl-CoA, was immobilized in the substrate-binding pocket of SDR3 through coordination with Arg1164 and Arg799 of SDR4 and the extra domain, respectively. Malonyl-CoA was successively reduced through protonation by the Tyr743-Arg746 pair in SDR3 and the catalytic triad (Thr165-Tyr178-Lys182) in SDR1 after nucleophilic attack from NADPH hydrides. IMPORTANCE The bi-functional MCR catalyzes NADPH-dependent reduction of malonyl-CoA to 3-HP, an important metabolic intermediate and platform chemical, from biomass. The individual MCR-N and MCR-C fragments, which contain the alcohol dehydrogenase and aldehyde dehydrogenase (CoA-acylating) activities, respectively, have previously been structurally investigated and reconstructed into a malonyl-CoA pathway for the biosynthetic production of 3-HP. However, no structural information for full-length MCR has been available to illustrate the catalytic mechanism of this enzyme, which greatly limits our capacity to increase the 3-HP yield of recombinant strains. Here, we report the cryo-electron microscopy structure of full-length MCR for the first time and elucidate the mechanisms underlying substrate selection, coordination, and catalysis in the bi-functional MCR. These findings provide a structural and mechanistic basis for enzyme engineering and biosynthetic applications of the 3-HP carbon fixation pathways. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 143.6 KB | Display | ![]() |
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PDB format | ![]() | 106.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.1 MB | Display | |
Data in XML | ![]() | 24.3 KB | Display | |
Data in CIF | ![]() | 34.2 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8hi4SC ![]() 8hi6C C: citing same article ( S: Starting model for refinement |
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Similar structure data | Similarity search - Function & homology ![]() |
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 73024.969 Da / Num. of mol.: 1 / Fragment: C terminal domain Source method: isolated from a genetically manipulated source Details: The amino acid residues Met563-Ser566 are sequences derived from the expression vector, and His567-His572 are expression tag for purification of the target protein Source: (gene. exp.) ![]() Strain: DSM 13941 / HLO8 / Gene: Rcas_2929 / Production host: ![]() ![]() |
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#2: Chemical | ChemComp-FK2 / |
#3: Chemical | ChemComp-NAP / |
#4: Water | ChemComp-HOH / |
Has ligand of interest | Y |
-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 2.6 Å3/Da / Density % sol: 52.67 % |
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Crystal grow | Temperature: 289 K / Method: vapor diffusion, hanging drop Details: 1.6 M sodium formate, and 0.1 M Bis-Tris propane pH 7.0 |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: DECTRIS EIGER X 16M / Detector: PIXEL / Date: Oct 30, 2021 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.97915 Å / Relative weight: 1 |
Reflection | Resolution: 2.3→41.58 Å / Num. obs: 35934 / % possible obs: 99.92 % / Redundancy: 37.4 % / CC1/2: 0.999 / Net I/σ(I): 22.39 |
Reflection shell | Resolution: 2.3→2.382 Å / Num. unique obs: 3517 / CC1/2: 0.834 |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 8HI4 Resolution: 2.3→41.58 Å / SU ML: 0.33 / Cross valid method: THROUGHOUT / σ(F): 1.35 / Phase error: 26.6 / Stereochemistry target values: ML
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 2.3→41.58 Å
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LS refinement shell |
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