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- PDB-7yix: The Cryo-EM Structure of Human Tissue Nonspecific Alkaline Phosph... -

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Basic information

Entry
Database: PDB / ID: 7yix
TitleThe Cryo-EM Structure of Human Tissue Nonspecific Alkaline Phosphatase and Single-Chain Fragment Variable (ScFv) Complex.
Components
  • Alkaline phosphatase, tissue-nonspecific isozyme
  • scFvSingle-chain variable fragment
KeywordsHYDROLASE / alkaline phosphatase / bone mineralization / catalytic network / hypophosphatasia / structural biology
Function / homology
Function and homology information


phosphoamidase / pyridoxal phosphate metabolic process / phosphoamidase activity / phosphoethanolamine phosphatase activity / response to vitamin B6 / futile creatine cycle / pyridoxal phosphatase activity / developmental process involved in reproduction / ADP phosphatase activity / response to macrophage colony-stimulating factor ...phosphoamidase / pyridoxal phosphate metabolic process / phosphoamidase activity / phosphoethanolamine phosphatase activity / response to vitamin B6 / futile creatine cycle / pyridoxal phosphatase activity / developmental process involved in reproduction / ADP phosphatase activity / response to macrophage colony-stimulating factor / inhibition of non-skeletal tissue mineralization / pyrophosphatase activity / Post-translational modification: synthesis of GPI-anchored proteins / cementum mineralization / alkaline phosphatase / alkaline phosphatase activity / response to sodium phosphate / phosphate ion homeostasis / inorganic diphosphate phosphatase activity / cellular homeostasis / endochondral ossification / response to vitamin D / bone mineralization / cellular response to organic cyclic compound / calcium ion homeostasis / side of membrane / dephosphorylation / response to glucocorticoid / extracellular matrix / skeletal system development / mitochondrial membrane / response to insulin / mitochondrial intermembrane space / osteoblast differentiation / positive regulation of cold-induced thermogenesis / response to lipopolysaccharide / response to antibiotic / calcium ion binding / ATP hydrolysis activity / extracellular exosome / extracellular region / membrane / plasma membrane
Similarity search - Function
Alkaline phosphatase, active site / Alkaline phosphatase active site. / Alkaline phosphatase / Alkaline phosphatase / Alkaline phosphatase homologues / Alkaline-phosphatase-like, core domain superfamily
Similarity search - Domain/homology
Alkaline phosphatase, tissue-nonspecific isozyme
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.96 Å
AuthorsYu, Y.T. / Yao, D.Q. / Zhang, Q. / Rao, B. / Xia, Y. / Lu, Y. / Qin, A. / Ma, P.X. / Cao, Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nat Commun / Year: 2023
Title: The structural pathology for hypophosphatasia caused by malfunctional tissue non-specific alkaline phosphatase.
Authors: Yating Yu / Kewei Rong / Deqiang Yao / Qing Zhang / Xiankun Cao / Bing Rao / Ying Xia / Yi Lu / Yafeng Shen / Ying Yao / Hongtao Xu / Peixiang Ma / Yu Cao / An Qin /
Abstract: Hypophosphatasia (HPP) is a metabolic bone disease that manifests as developmental abnormalities in bone and dental tissues. HPP patients exhibit hypo-mineralization and osteopenia due to the ...Hypophosphatasia (HPP) is a metabolic bone disease that manifests as developmental abnormalities in bone and dental tissues. HPP patients exhibit hypo-mineralization and osteopenia due to the deficiency or malfunction of tissue non-specific alkaline phosphatase (TNAP), which catalyzes the hydrolysis of phosphate-containing molecules outside the cells, promoting the deposition of hydroxyapatite in the extracellular matrix. Despite the identification of hundreds of pathogenic TNAP mutations, the detailed molecular pathology of HPP remains unclear. Here, to address this issue, we determine the crystal structures of human TNAP at near-atomic resolution and map the major pathogenic mutations onto the structure. Our study reveals an unexpected octameric architecture for TNAP, which is generated by the tetramerization of dimeric TNAPs, potentially stabilizing the TNAPs in the extracellular environments. Moreover, we use cryo-electron microscopy to demonstrate that the TNAP agonist antibody (JTALP001) forms a stable complex with TNAP by binding to the octameric interface. The administration of JTALP001 enhances osteoblast mineralization and promoted recombinant TNAP-rescued mineralization in TNAP knockout osteoblasts. Our findings elucidate the structural pathology of HPP and highlight the therapeutic potential of the TNAP agonist antibody for osteoblast-associated bone disorders.
History
DepositionJul 18, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Aug 16, 2023Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Alkaline phosphatase, tissue-nonspecific isozyme
B: Alkaline phosphatase, tissue-nonspecific isozyme
C: scFv
D: scFv
hetero molecules


Theoretical massNumber of molelcules
Total (without water)174,67420
Polymers171,7014
Non-polymers2,97316
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein / Antibody , 2 types, 4 molecules ABCD

#1: Protein Alkaline phosphatase, tissue-nonspecific isozyme / / AP-TNAP / TNS-ALP / TNSALP / Alkaline phosphatase liver/bone/kidney isozyme / Phosphoamidase / ...AP-TNAP / TNS-ALP / TNSALP / Alkaline phosphatase liver/bone/kidney isozyme / Phosphoamidase / Phosphocreatine phosphatase


Mass: 57020.188 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ALPL / Production host: Trichopalpus nigribasis (fry)
References: UniProt: P05186, alkaline phosphatase, phosphoamidase
#2: Antibody scFv / Single-chain variable fragment


Mass: 28830.195 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Mammalia (mammals)

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Sugars , 2 types, 8 molecules

#3: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#4: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 3 types, 8 molecules

#5: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#7: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY

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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: hALPL-scFv / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Trichopalpus nigribasis (fry)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 281.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2800 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.96 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 314858 / Symmetry type: POINT

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