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- PDB-9ees: Cryo-EM model of E. coli aspartate transcarbamoylase in an expand... -

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Basic information

Entry
Database: PDB / ID: 9ees
TitleCryo-EM model of E. coli aspartate transcarbamoylase in an expanded state complexed with CP, ATP, GTP, and Mg2+
Components
  • Aspartate carbamoyltransferase
  • Aspartate carbamoyltransferase regulatory chain
KeywordsCYTOSOLIC PROTEIN / Complex / Allostery / MWC / ATCase / T-state / R-state / ATP / GTP / Expanded
Function / homology
Function and homology information


aspartate carbamoyltransferase complex / pyrimidine nucleotide biosynthetic process / aspartate carbamoyltransferase / aspartate carbamoyltransferase activity / amino acid metabolic process / amino acid binding / 'de novo' UMP biosynthetic process / 'de novo' pyrimidine nucleobase biosynthetic process / transferase activity / metal ion binding / cytosol
Similarity search - Function
Aspartate transcarbamylase regulatory subunit / Aspartate carbamoyltransferase regulatory subunit, C-terminal / Aspartate carbamoyltransferase regulatory subunit, N-terminal / Aspartate carbamoyltransferase regulatory subunit, C-terminal domain superfamily / Aspartate carbamoyltransferase regulatory subunit, N-terminal domain superfamily / Aspartate carbamoyltransferase regulatory chain, allosteric domain / Aspartate carbamoyltransferase regulatory chain, metal binding domain / Aspartate carbamoyltransferase / Aspartate and ornithine carbamoyltransferases signature. / Aspartate/ornithine carbamoyltransferase ...Aspartate transcarbamylase regulatory subunit / Aspartate carbamoyltransferase regulatory subunit, C-terminal / Aspartate carbamoyltransferase regulatory subunit, N-terminal / Aspartate carbamoyltransferase regulatory subunit, C-terminal domain superfamily / Aspartate carbamoyltransferase regulatory subunit, N-terminal domain superfamily / Aspartate carbamoyltransferase regulatory chain, allosteric domain / Aspartate carbamoyltransferase regulatory chain, metal binding domain / Aspartate carbamoyltransferase / Aspartate and ornithine carbamoyltransferases signature. / Aspartate/ornithine carbamoyltransferase / Aspartate/ornithine carbamoyltransferase, Asp/Orn-binding domain / Aspartate/ornithine carbamoyltransferase, carbamoyl-P binding / Aspartate/ornithine carbamoyltransferase superfamily / Aspartate/ornithine carbamoyltransferase, Asp/Orn binding domain / Aspartate/ornithine carbamoyltransferase, carbamoyl-P binding domain
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / PHOSPHORIC ACID MONO(FORMAMIDE)ESTER / GUANOSINE-5'-TRIPHOSPHATE / Aspartate carbamoyltransferase / Aspartate carbamoyltransferase regulatory chain
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.27 Å
AuthorsPatterson, M.G. / Miller, R.C. / Ando, N.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35 GM124847 United States
National Science Foundation (NSF, United States)DMR-1719875 United States
Other governmentU24 GM129539
Simons FoundationSF349247 United States
Citation
Journal: Nat Commun / Year: 2026
Title: Cooperativity in E. coli aspartate transcarbamoylase is tuned by allosteric breathing.
Authors: Robert C Miller / Michael G Patterson / Neti Bhatt / Xiaokun Pei / Nozomi Ando /
Abstract: Aspartate transcarbamoylase (ATCase) from Escherichia coli catalyzes a key step in pyrimidine nucleotide biosynthesis and has long served as a model for allosteric regulation. Despite decades of ...Aspartate transcarbamoylase (ATCase) from Escherichia coli catalyzes a key step in pyrimidine nucleotide biosynthesis and has long served as a model for allosteric regulation. Despite decades of study, how nucleotide binding at distant regulatory sites controls cooperativity between active sites remained unresolved. Here we show that ATCase does not simply interconvert between two conformations, as traditionally depicted, but instead samples a continuum of conformations that tune enzyme cooperativity. Using complementary cryo-electron microscopy, small-angle X-ray scattering, and crystallography under conditions that ensure full assembly of the allosteric sites, we show that ATCase behaves like a flexible balloon whose global "breathing" motions directly regulate activity: compression enforces high cooperativity, inhibiting the enzyme, whereas expansion relieves this cooperativity and activates the enzyme. We further show that all four ribonucleoside triphosphates act in symmetric pairs to tune this motion, with the pyrimidines CTP and UTP compressing the enzyme to limit further pyrimidine production, and the purines ATP and GTP expanding it to balance pyrimidine and purine pools. Together, these findings uncover a dynamic breathing mechanism for long-range allosteric communication in ATCase.
#1: Journal: Acta Crystallogr D Struct Biol / Year: 2019
Title: Macromolecular structure determination using X-rays, neutrons and electrons: recent developments in Phenix.
Authors: Dorothee Liebschner / Pavel V Afonine / Matthew L Baker / Gábor Bunkóczi / Vincent B Chen / Tristan I Croll / Bradley Hintze / Li Wei Hung / Swati Jain / Airlie J McCoy / Nigel W Moriarty ...Authors: Dorothee Liebschner / Pavel V Afonine / Matthew L Baker / Gábor Bunkóczi / Vincent B Chen / Tristan I Croll / Bradley Hintze / Li Wei Hung / Swati Jain / Airlie J McCoy / Nigel W Moriarty / Robert D Oeffner / Billy K Poon / Michael G Prisant / Randy J Read / Jane S Richardson / David C Richardson / Massimo D Sammito / Oleg V Sobolev / Duncan H Stockwell / Thomas C Terwilliger / Alexandre G Urzhumtsev / Lizbeth L Videau / Christopher J Williams / Paul D Adams /
Abstract: Diffraction (X-ray, neutron and electron) and electron cryo-microscopy are powerful methods to determine three-dimensional macromolecular structures, which are required to understand biological ...Diffraction (X-ray, neutron and electron) and electron cryo-microscopy are powerful methods to determine three-dimensional macromolecular structures, which are required to understand biological processes and to develop new therapeutics against diseases. The overall structure-solution workflow is similar for these techniques, but nuances exist because the properties of the reduced experimental data are different. Software tools for structure determination should therefore be tailored for each method. Phenix is a comprehensive software package for macromolecular structure determination that handles data from any of these techniques. Tasks performed with Phenix include data-quality assessment, map improvement, model building, the validation/rebuilding/refinement cycle and deposition. Each tool caters to the type of experimental data. The design of Phenix emphasizes the automation of procedures, where possible, to minimize repetitive and time-consuming manual tasks, while default parameters are chosen to encourage best practice. A graphical user interface provides access to many command-line features of Phenix and streamlines the transition between programs, project tracking and re-running of previous tasks.
History
DepositionNov 19, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Apr 15, 2026Provider: repository / Type: Initial release
Revision 1.0Apr 15, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Apr 15, 2026Data content type: Additional map / Part number: 1 / Data content type: Additional map / Provider: repository / Type: Initial release
Revision 1.0Apr 15, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Apr 15, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 15, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Apr 15, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Apr 15, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
D: Aspartate carbamoyltransferase regulatory chain
E: Aspartate carbamoyltransferase regulatory chain
H: Aspartate carbamoyltransferase regulatory chain
I: Aspartate carbamoyltransferase regulatory chain
J: Aspartate carbamoyltransferase regulatory chain
L: Aspartate carbamoyltransferase regulatory chain
F: Aspartate carbamoyltransferase
K: Aspartate carbamoyltransferase
C: Aspartate carbamoyltransferase
A: Aspartate carbamoyltransferase
B: Aspartate carbamoyltransferase
G: Aspartate carbamoyltransferase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)316,45142
Polymers308,88412
Non-polymers7,56730
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Noncrystallographic symmetry (NCS)NCS domain:
IDEns-IDDetails (eV)
d_1ens_1chain "C"
d_2ens_1chain "G"
d_3ens_1chain "K"
d_4ens_1chain "A"
d_5ens_1chain "F"
d_6ens_1chain "B"
d_1ens_2chain "E"
d_2ens_2chain "H"
d_3ens_2chain "J"
d_1ens_3chain "I"
d_2ens_3chain "D"
d_3ens_3chain "L"

NCS domain segments:
Dom-IDComponent-IDEns-IDBeg auth comp-IDBeg label comp-IDEnd auth comp-IDEnd label comp-IDAuth asym-IDLabel asym-IDAuth seq-IDLabel seq-ID
d_11ens_1ALAALALEULEUCI1 - 3101 - 310
d_12ens_1CPCPCPCPCMA401
d_21ens_1ALAALALEULEUGL1 - 3101 - 310
d_22ens_1CPCPCPCPGPA401
d_31ens_1ALAALALEULEUKH1 - 3101 - 310
d_32ens_1CPCPCPCPKLA401
d_41ens_1ALAALALEULEUAJ1 - 3101 - 310
d_42ens_1CPCPCPCPANA401
d_51ens_1ALAALALEULEUFG1 - 3101 - 310
d_52ens_1CPCPCPCPFKA401
d_61ens_1ALAALALEULEUBK1 - 3101 - 310
d_62ens_1CPCPCPCPBOA401
d_11ens_2ASPASPASNASNEB4 - 1534 - 153
d_12ens_2ZNZNZNZNEQ201
d_13ens_2ATPATPATPATPER202
d_14ens_2GTPGTPGTPGTPES203
d_21ens_2ASPASPASNASNHC4 - 1534 - 153
d_22ens_2ZNZNZNZNHU201
d_23ens_2ATPATPATPATPHV202
d_24ens_2GTPGTPGTPGTPHW203
d_31ens_2ASPASPASNASNJE4 - 1534 - 153
d_32ens_2ZNZNZNZNJCA201
d_33ens_2ATPATPATPATPJDA202
d_34ens_2GTPGTPGTPGTPJEA203
d_11ens_3ASPASPASNASNID4 - 1534 - 153
d_12ens_3ZNZNZNZNIY201
d_13ens_3ATPATPATPATPIZ202
d_14ens_3GTPGTPGTPGTPIAA203
d_21ens_3ASPASPASNASNDA4 - 1534 - 153
d_22ens_3ZNZNZNZNDM201
d_23ens_3ATPATPATPATPDN202
d_24ens_3GTPGTPGTPGTPDO203
d_31ens_3ASPASPASNASNLF4 - 1534 - 153
d_32ens_3ZNZNZNZNLGA201
d_33ens_3ATPATPATPATPLHA202
d_34ens_3GTPGTPGTPGTPLIA203

NCS ensembles :
ID
ens_1
ens_2
ens_3

NCS oper:
IDCodeMatrixVector
1given(-0.500454611028, 0.865762770403, -8.76640241114E-5), (-0.865762752624, -0.500454618559, -0.000175873077701), (-0.000196136228738, -1.21202458706E-5, 0.999999980692)94.3861313929, 351.834264551, 0.0345888470501
2given(-0.499871946404, -0.86609931429, 0.000122411398), (0.866099320448, -0.499871929247, 0.000146528236553), (-6.57179835224E-5, 0.000179265783431, 0.999999981772)351.760384191, 94.2096825849, -0.0177956662762
3given(0.848106951478, -0.529825062776, -4.13357848059E-5), (-0.529823367479, -0.848104035145, -0.00259708375468), (0.00134094301747, 0.00222450545062, -0.999996626718)101.318426619, 353.774245141, 295.451651167
4given(-0.882960546286, -0.469443055282, -0.0019727012452), (-0.469445846015, 0.882960296654, 0.00130850777704), (0.00112754698796, 0.00208143714662, -0.999997198125)349.946371864, 87.1205344004, 295.508155891
5given(0.0348227523439, 0.999390825553, 0.00231381054493), (0.999393152605, -0.0348245883745, 0.000758004047243), (0.00083811979035, 0.00228601062781, -0.999997035851)-5.26978966278, 5.17409381568, 295.52345402
6given(-0.490976910536, 0.871149950444, -0.00627990146604), (-0.871172526896, -0.490961482263, 0.00390529322839), (0.000318906270148, 0.00738828643284, 0.999972655387)93.2344827145, 350.14268189, -1.40403214638
7given(-0.499661373705, -0.866217809627, -0.00228427507645), (0.866218956504, -0.499653088382, -0.00339273700169), (0.00179750411758, -0.00367390200397, 0.999991635677)352.155921043, 94.6943924339, 0.477479329296
8given(-0.489719605003, 0.871878678013, 0.00150973552966), (-0.871865980777, -0.489720819159, 0.00481983882877), (0.00494166362656, 0.00104408251912, 0.999987244845)91.777061801, 349.837368162, -0.773370322414
9given(-0.500812217055, -0.865553926359, 0.00187718209153), (0.86554779055, -0.500815735085, -0.00325910498649), (0.00376105344653, -7.4087821122E-6, 0.999992927186)351.541263123, 94.9987446243, -0.537487909014

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Components

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Protein , 2 types, 12 molecules DEHIJLFKCABG

#1: Protein
Aspartate carbamoyltransferase regulatory chain


Mass: 17143.625 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli)
Gene: pyrI, A2J79_003078, A5U30_000934, ABE91_001630, ABT96_002052, ACN81_01165, ACU57_15645, ACW72_001369, ATM34_004869, AWP47_22675, B6R15_003055, B6R31_000751, BANRA_00251, BANRA_02936, BCB93_ ...Gene: pyrI, A2J79_003078, A5U30_000934, ABE91_001630, ABT96_002052, ACN81_01165, ACU57_15645, ACW72_001369, ATM34_004869, AWP47_22675, B6R15_003055, B6R31_000751, BANRA_00251, BANRA_02936, BCB93_002761, BE932_21745, BG944_000741, BGM66_001591, BGZ_01519, BGZ_05216, BJI68_10435, BK300_13465, BK383_13475, BKL28_003430, BMT50_05825, BRV02_003862, BTB68_002686, BTQ06_18965, BvCmsKKP061_03433, BvCmsNSP007_04795, BVE17_001555, BXT93_08875, C0P57_000164, C1Q91_004308, C2M16_07710, C2R31_000938, C3F40_13760, C4M78_05245, C7B02_12530, C9160_23135, CF22_004478, CG704_05435, CIG67_22820, CLG78_001650, CQ842_08920, CQ842_12485, CR538_22705, CTR35_001469, CV628_004971, CV83915_01780, CWS33_03950, D3C88_12935, D3G36_17315, D4M65_07260, D4N09_04840, D9D43_13595, D9E49_11440, D9J61_12550, DAH27_26525, DD762_15800, DIV22_16800, DL738_14650, DL968_06885, DNQ45_09635, DNX30_17145, DS732_03295, DTL43_02745, DU321_18180, E0I52_01830, E2865_05518, E4K51_15130, E5H86_07995, E6D34_03385, EAI46_26265, ECs5221, EF082_09960, EIA08_16950, EN85_001336, EPS97_17820, EWK56_08305, ExPECSC038_04762, F7G01_01055, F7N46_16835, F9413_07040, F9461_17650, F9B07_19115, FGAF1022_42660, FGAF848_40920, FIJ20_18925, FJQ40_01265, FKO60_19420, FOI11_014385, FOI11_21295, FPI65_26080, FPS11_22330, FTV93_15585, FWK02_19125, FZU14_19580, G3V95_10560, G3W53_08350, G4A38_03450, G4A47_10540, G5603_09985, GAI89_04010, GAJ12_10375, GNW61_17470, GOP25_13770, GP711_18320, GP954_15650, GP965_09380, GP979_09970, GQA06_14590, GQE86_05415, GQM04_23145, GQM13_11155, GQN24_22420, GQN34_01855, GRC73_06810, GRW05_26910, GRW24_19530, GUC01_09440, H0O72_05310, HEP30_009870, HEP34_001711, HHH44_002260, HI084_001706, HIA71_17175, HID72_003760, HIE29_003971, HJ488_000369, HJQ60_002439, HJS37_003258, HKA49_000762, HLZ39_13925, HLZ50_15090, HMV95_06310, HV109_21095, HV209_29450, HVV39_15600, HVW43_13620, HVW90_11240, HVY77_22740, I6H00_15805, I6H02_17080, IFC14_000343, IG021_000550, J0541_002250, J8F57_000039, JNP96_03410, KTF03_003069, NCTC10082_01749, NCTC10089_04452, NCTC10418_06552, NCTC10429_04598, NCTC10764_04396, NCTC10767_00304, NCTC10865_05524, NCTC10974_05017, NCTC11112_02869, NCTC11126_02378, NCTC11181_01681, NCTC11341_03160, NCTC13148_04787, NCTC7922_05338, NCTC7927_04891, NCTC8009_07825, NCTC8179_04754, NCTC8621_04480, NCTC8622_02187, NCTC8959_04206, NCTC8960_01944, NCTC8985_03620, NCTC9045_05134, NCTC9073_03833, NCTC9077_05555, NCTC9081_01671, NCTC9117_05503, NCTC9702_05191, NCTC9703_03795, NCTC9706_01714, NCTC9962_01701, OFN31_17645, OGM49_02120, P6223_000604, PWL68_003651, QDW62_23135, R8G00_26830, R8O40_003192, RZR61_03905, SAMEA3472044_01446, SAMEA3472112_04513, SAMEA3752557_01747, TUM18780_38880
Production host: Escherichia coli (E. coli) / References: UniProt: C3SF57
#2: Protein
Aspartate carbamoyltransferase / Aspartate transcarbamylase / ATCase


Mass: 34337.105 Da / Num. of mol.: 6
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli)
Gene: pyrB, A2J79_003077, ABE91_001635, ABT96_002053, ACN81_01160, ACW72_001368, ATM34_004868, AW118_07535, AWP47_22680, B6R15_003056, B6R31_000750, BANRA_02937, BE932_21750, BER14_11960, BG944_ ...Gene: pyrB, A2J79_003077, ABE91_001635, ABT96_002053, ACN81_01160, ACW72_001368, ATM34_004868, AW118_07535, AWP47_22680, B6R15_003056, B6R31_000750, BANRA_02937, BE932_21750, BER14_11960, BG944_000740, BGM66_001590, BGZ_01518, BGZ_05217, BJI68_10440, BK300_13470, BK383_13480, BKL28_003429, BRV02_003861, BTB68_002687, BTQ06_18960, BvCmsNSP007_04794, BVE17_001554, BXT93_08870, C0P57_000163, C1Q91_004309, C2M16_07715, C2R31_000937, C3F40_13755, C4M78_05240, C719_002693, C9114_01215, C9160_23140, C9Z68_08980, CF22_004479, CG704_05430, CIG67_22815, CLG78_001649, CQ842_08915, CQ842_12490, CR538_22700, CTR35_001468, CV628_004970, CV83915_01779, CWS33_03955, D3C88_12940, D3G36_17310, D4M65_07255, D4N09_04845, D9D43_13600, D9E49_11435, D9J61_12555, DAH27_26520, DIV22_16805, DNQ45_09630, DNX30_17140, DS732_03300, DTL43_02750, DU321_18175, E2865_05519, E5H86_07990, E6D34_03380, EAI46_26260, ECs5222, EF082_09955, EIA08_16955, EIZ93_20760, EN85_001335, EPS76_30055, EPS97_17825, EWK56_08300, ExPECSC038_04763, F7F11_04770, F7G01_01060, F7N46_16830, F9413_07035, F9B07_19120, FEH53_07480, FGAF1022_42670, FIJ20_18930, FJQ40_01260, FKO60_19415, FOI11_014380, FOI11_21300, FPI65_26085, FPS11_22335, FVB16_24685, FZU14_19575, G3V95_10555, G3W53_08345, G4A38_03455, G4A47_10535, G5603_09990, G6Z99_20225, GAI89_04005, GAJ12_10370, GKF66_08525, GNW61_17465, GNZ05_12485, GOP25_13765, GP965_09375, GP979_09965, GQE86_05410, GQM04_23140, GQM13_11160, GQM21_13835, GQN24_22415, GRC73_06815, GRW05_26905, GRW24_19535, GTP92_08545, GUC01_09445, HEP34_001710, HHH44_002259, HI055_001287, HI084_001705, HIA71_17170, HID72_003759, HIE29_003970, HJ488_000368, HJS37_003257, HKA49_000761, HLX92_11970, HLZ39_13930, HLZ50_15085, HND12_14900, HV209_29455, HVV39_15605, HVW04_12090, HVW43_13615, HVW90_11235, HVY77_22735, I6H00_15800, I6H02_17085, IFN33_000225, IG021_000549, IH772_04275, J0541_002249, J5U05_001302, J8F57_000038, KQO22_002766, NCTC10082_01748, NCTC10089_04451, NCTC10764_04395, NCTC10767_00303, NCTC10865_05523, NCTC10974_05016, NCTC11112_02870, NCTC11181_01680, NCTC11341_03161, NCTC13148_04788, NCTC7922_05337, NCTC7928_04108, NCTC8179_04755, NCTC8500_04950, NCTC8621_04481, NCTC8959_04205, NCTC8960_01943, NCTC8985_03619, NCTC9001_04952, NCTC9044_02747, NCTC9045_05133, NCTC9073_03832, NCTC9081_01672, NCTC9117_05502, NCTC9702_05190, NCTC9703_03794, OFN31_17640, OGM49_02125, P6223_000603, QDW62_23130, R8G00_26825, R8O40_003191, RZR61_03900, SAMEA3472044_01445, SAMEA3472112_04514, SAMEA3752557_01748, TUM18780_38870
Production host: Escherichia coli (E. coli) / References: UniProt: C3SF53, aspartate carbamoyltransferase

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Non-polymers , 5 types, 30 molecules

#3: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Zn
#4: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Comment: ATP, energy-carrying molecule*YM
#5: Chemical
ChemComp-GTP / GUANOSINE-5'-TRIPHOSPHATE


Mass: 523.180 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C10H16N5O14P3 / Comment: GTP, energy-carrying molecule*YM
#6: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Mg
#7: Chemical
ChemComp-CP / PHOSPHORIC ACID MONO(FORMAMIDE)ESTER


Mass: 141.020 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: CH4NO5P

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Details

Has ligand of interestN
Has protein modificationN

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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: E. coli aspartate transcarbamoylase is an expanded quaternary state complexed with CP, ATP, GTP, and Mg2+
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Escherichia coli (E. coli)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
140 mMTris(hydroxymethyl)aminomethane hydrochlorideC4H11NO31
215 mMMagnesium chlorideMgCl21
31 mMTris(2-carboxyethyl)phosphineC9H15O6P1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: E. coli aspartate transcarbamoylase is an expanded quaternary state complexed with CP, ATP, GTP, and Mg2+
Specimen supportDetails: Grids were manually coated with graphene-oxide following glow-discharge as is described in the associated publication.
Grid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2300 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 63.45 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameVersionCategory
2PHENIX1.21.1_5286model refinement
5cryoSPARC4CTF correction
10cryoSPARC4initial Euler assignment
11RELION4final Euler assignment
13RELION43D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 3.27 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 163000 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 105.46 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.002822368
ELECTRON MICROSCOPYf_angle_d0.512730426
ELECTRON MICROSCOPYf_chiral_restr0.04183510
ELECTRON MICROSCOPYf_plane_restr0.00313960
ELECTRON MICROSCOPYf_dihedral_angle_d7.44513276
Refine LS restraints NCS
Ens-IDDom-IDAsym-IDAuth asym-IDRefine-IDTypeRms dev position (Å)
ens_1d_2ICELECTRON MICROSCOPYNCS constraints8.38841531909E-12
ens_1d_3ICELECTRON MICROSCOPYNCS constraints1.64031577659E-11
ens_1d_4ICELECTRON MICROSCOPYNCS constraints1.72640977754E-12
ens_1d_5ICELECTRON MICROSCOPYNCS constraints5.94818107943E-13
ens_1d_6ICELECTRON MICROSCOPYNCS constraints6.33485892676E-13
ens_2d_2BEELECTRON MICROSCOPYNCS constraints2.79057937275E-12
ens_2d_3BEELECTRON MICROSCOPYNCS constraints6.6928559566E-12
ens_3d_2DIELECTRON MICROSCOPYNCS constraints4.85472728807E-11
ens_3d_3DIELECTRON MICROSCOPYNCS constraints3.80717038334E-10

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