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Yorodumi- EMDB-73595: Structure of the long chain acyl-CoA carboxylase complex from Myc... -
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Basic information
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| Title | Structure of the long chain acyl-CoA carboxylase complex from Mycobacterium smegmatis with ATP, bicarbonate, arachidoyl-CoA, and propionyl-CoA | |||||||||
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Keywords | Carboxylase / transferase / lipid synthesis / mycolic acid synthesis / LIGASE | |||||||||
| Function / homology | Function and homology informationpropionyl-CoA carboxylase / biotin carboxylase / propionyl-CoA carboxylase activity / acetyl-CoA carboxylase complex / biotin carboxylase activity / acetyl-CoA carboxylase activity / carbon fixation / fatty acid biosynthetic process / ATP binding / metal ion binding Similarity search - Function | |||||||||
| Biological species | Mycolicibacterium smegmatis MC2 155 (bacteria) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 2.3 Å | |||||||||
Authors | Liang Y / Rubinstein JL | |||||||||
| Funding support | Canada, 1 items
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Citation | Journal: Proc Natl Acad Sci U S A / Year: 2026Title: Structural basis for substrate specificity and MSMEG_0435-0436 binding by the mycobacterial long-chain acyl-CoA carboxylase complex. Authors: Yingke Liang / Stephanie A Bueler / John L Rubinstein / ![]() Abstract: The presence of mycolic acid is a defining feature of the mycobacterial cell wall, which provides a highly impermeable barrier to many antibiotics. Biosynthesis of this fatty acid, as well as ...The presence of mycolic acid is a defining feature of the mycobacterial cell wall, which provides a highly impermeable barrier to many antibiotics. Biosynthesis of this fatty acid, as well as tuberculostearic acid, requires precursor molecules produced by the essential long-chain acyl-coenzyme A (CoA) carboxylase (LCC) complex. The LCC complex catalyzes carboxylation of the α-carbon of long-chain acyl-CoA, but also short-chain acetyl-CoA and propionyl-CoA. The complex includes the subunits AccA3, which contains a biotin carboxylase (BC) domain and a biotin carboxyl carrier protein (BCCP) domain, the long-chain acyl-CoA carboxyltransferase AccD4, the short-chain acyl-CoA carboxyltransferase AccD5, and the incompletely characterized protein AccE. We used electron cryomicroscopy (cryo-EM) to determine structures of the LCC complex from . In the structures, two AccE subunits tether eight AccA3 subunits to an AccD4AccD5 heterohexamer core. Cryo-EM of the enzyme during catalysis reveals how AccD4 and AccD5 achieve substrate specificity, with AccD5 binding tightly to CoA and AccD4 binding long acyl chains. The BCCP domains of AccA3 undergo long-distance translocation to transfer a carboxyl group from the BC domain of AccA3 to the acyl-CoA substrate bound in AccD5. Further, we find that two copies of a protein complex formed from MSMEG_0435 and MSMEG_0436 can bind the LCC complex, sequestering the biotin moiety of BCCP domains near AccD5 and decreasing propionyl-CoA carboxylase activity. Rv0263c, the ortholog of MSMEG_0435, has a role in bacterial survival during transmission, suggesting that these proteins may regulate production of branched fatty acid precursors for the mycobacterial cell wall. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_73595.map.gz | 196.5 MB | EMDB map data format | |
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| Header (meta data) | emd-73595-v30.xml emd-73595.xml | 25 KB 25 KB | Display Display | EMDB header |
| Images | emd_73595.png | 73.2 KB | ||
| Filedesc metadata | emd-73595.cif.gz | 7.7 KB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-73595 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-73595 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9yx4MC ![]() 9yx0C ![]() 9yx1C ![]() 9yx2C ![]() 9yx5C C: citing same article ( M: atomic model generated by this map |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_73595.map.gz / Format: CCP4 / Size: 421.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 0.93 Å | ||||||||||||||||||||||||||||||||||||
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : Structure of the long chain acyl-CoA carboxylase complex from Myc...
+Supramolecule #1: Structure of the long chain acyl-CoA carboxylase complex from Myc...
+Macromolecule #1: Biotin-dependent acyl-coenzyme A carboxylase alpha3 subunit
+Macromolecule #2: Acetyl-/propionyl-coenzyme A carboxylase AccE5
+Macromolecule #3: Propionyl-CoA carboxylase beta chain
+Macromolecule #4: Propionyl-CoA carboxylase beta chain
+Macromolecule #5: BIOTIN
+Macromolecule #6: BICARBONATE ION
+Macromolecule #7: ADENOSINE-5'-TRIPHOSPHATE
+Macromolecule #8: MAGNESIUM ION
+Macromolecule #9: S-{(3S,5S,9R)-1-[(2R,3S,4R,5R)-5-(6-amino-9H-purin-9-yl)-4-hydrox...
+Macromolecule #10: propionyl Coenzyme A
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Concentration | 5 mg/mL |
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| Buffer | pH: 6 |
| Grid | Model: Homemade / Material: COPPER/RHODIUM / Mesh: 400 / Support film - Material: GOLD / Support film - topology: HOLEY / Support film - Film thickness: 35 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 15 sec. / Pretreatment - Atmosphere: AIR |
| Vitrification | Cryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 277 K / Instrument: LEICA EM GP |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Specialist optics | Energy filter - Name: TFS Selectris X / Energy filter - Slit width: 10 eV |
| Image recording | Film or detector model: TFS FALCON 4i (4k x 4k) / Number real images: 8000 / Average electron dose: 50.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 20.0 µm / Nominal defocus min: 1.1 µm / Nominal magnification: 130000 |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi



Keywords
Mycolicibacterium smegmatis MC2 155 (bacteria)
Authors
Canada, 1 items
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Processing
FIELD EMISSION GUN
