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- PDB-8xj4: Structure of prostatic acid phosphatase in human semen -

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Basic information

Entry
Database: PDB / ID: 8xj4
TitleStructure of prostatic acid phosphatase in human semen
ComponentsProstatic acid phosphatase
KeywordsCELL CYCLE / Acid phosphatase
Function / homology
Function and homology information


thiamine phosphate phosphatase activity / positive regulation of adenosine receptor signaling pathway / thiamine metabolic process / Golgi cisterna / adenosine metabolic process / acid phosphatase / regulation of sensory perception of pain / lysophosphatidic acid phosphatase activity / XMP 5'-nucleosidase activity / acid phosphatase activity ...thiamine phosphate phosphatase activity / positive regulation of adenosine receptor signaling pathway / thiamine metabolic process / Golgi cisterna / adenosine metabolic process / acid phosphatase / regulation of sensory perception of pain / lysophosphatidic acid phosphatase activity / XMP 5'-nucleosidase activity / acid phosphatase activity / 5'-nucleotidase / 5'-nucleotidase activity / vesicle membrane / nucleotide metabolic process / choline binding / azurophil granule membrane / lysosome organization / phosphatase activity / purine nucleobase metabolic process / dephosphorylation / multivesicular body / protein-tyrosine-phosphatase / filopodium / protein tyrosine phosphatase activity / lipid metabolic process / apical part of cell / molecular adaptor activity / lysosome / lysosomal membrane / Neutrophil degranulation / protein homodimerization activity / extracellular space / extracellular exosome / identical protein binding / nucleus / plasma membrane / cytosol
Similarity search - Function
Histidine acid phosphatases active site signature. / Histidine acid phosphatases phosphohistidine signature. / Histidine acid phosphatase active site / Histidine phosphatase superfamily, clade-2 / Histidine phosphatase superfamily (branch 2) / Histidine phosphatase superfamily
Similarity search - Domain/homology
alpha-D-mannopyranose / Prostatic acid phosphatase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.19 Å
AuthorsLiu, X.Z. / Li, J.L. / Deng, D. / Wang, X.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Biochem Biophys Res Commun / Year: 2024
Title: Purification, identification and Cryo-EM structure of prostatic acid phosphatase in human semen.
Authors: Xuanzhong Liu / Lin Yu / Zhili Xia / Jialu Li / Wenbo Meng / Ling Min / Fuping Li / Xiang Wang /
Abstract: Prostatic acid phosphatase (PAP) is a glycoprotein that plays a crucial role in the hydrolysis of phosphate ester present in prostatic exudates. It is a well-established indicator for prostate cancer ...Prostatic acid phosphatase (PAP) is a glycoprotein that plays a crucial role in the hydrolysis of phosphate ester present in prostatic exudates. It is a well-established indicator for prostate cancer due to its elevated serum levels in disease progression. Despite its abundance in semen, PAP's influence on male fertility has not been extensively studied. In our study, we report a significantly optimized method for purifying human endogenous PAP, achieving remarkably high efficiency and active protein recovery rate. This achievement allowed us to better analyze and understand the PAP protein. We determined the cryo-electron microscopic (Cryo-EM) structure of prostatic acid phosphatase in its physiological state for the first time. Our structural and gel filtration analysis confirmed the formation of a tight homodimer structure of human PAP. This functional homodimer displayed an elongated conformation in the cryo-EM structure compared to the previously reported crystal structure. Additionally, there was a notable 5-degree rotation in the angle between the α domain and α/β domain of each monomer. Through structural analysis, we revealed three potential glycosylation sites: Asn94, Asn220, and Asn333. These sites contained varying numbers and forms of glycosyl units, suggesting sugar moieties influence PAP function. Furthermore, we found that the active sites of PAP, His44 and Asp290, are located between the two protein domains. Overall, our study not only provide an optimized approach for PAP purification, but also offer crucial insights into its structural characteristics. These findings lay the groundwork for further investigations into the physiological function and potential therapeutic applications of this important protein.
History
DepositionDec 20, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 28, 2024Provider: repository / Type: Initial release
Revision 1.1May 8, 2024Group: Database references / Category: citation
Item: _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: Prostatic acid phosphatase
A: Prostatic acid phosphatase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)82,9269
Polymers80,5262
Non-polymers2,4007
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Prostatic acid phosphatase / PAP


Mass: 40262.949 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Tissue: Human seminal plasma
References: UniProt: P15309, acid phosphatase, 5'-nucleotidase, protein-tyrosine-phosphatase
#2: Polysaccharide alpha-D-mannopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...alpha-D-mannopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DManpa1-3DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5]/1-1-2/a4-b1_b3-c1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][a-D-GlcpNAc]{[(3+1)][a-D-Manp]{}}}}LINUCSPDB-CARE
#3: Polysaccharide alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1- ...alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 748.682 Da / Num. of mol.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DManpa1-2DManpa1-3DGlcpNAcb1-4DGlcpNAcb1-Glycam Condensed SequenceGMML 1.0
WURCS=2.0/2,4,3/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1a_1-5]/1-1-2-2/a4-b1_b3-c1_c2-d1WURCSPDB2Glycan 1.1.0
[]{[(4+1)][b-D-GlcpNAc]{[(4+1)][a-D-GlcpNAc]{[(3+1)][a-D-Manp]{[(2+1)][b-D-Manp]{}}}}}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


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
#5: Sugar ChemComp-MAN / alpha-D-mannopyranose / alpha-D-mannose / D-mannose / mannose


Type: D-saccharide, alpha linking / Mass: 180.156 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H12O6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DManpaCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
a-D-mannopyranoseCOMMON NAMEGMML 1.0
a-D-ManpIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
ManSNFG CARBOHYDRATE SYMBOLGMML 1.0
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: structure of prostatic acid phosphatase in human semen
Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: NATURAL
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 8
SpecimenConc.: 8.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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 FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3.19 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 75346 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0045984
ELECTRON MICROSCOPYf_angle_d0.6398131
ELECTRON MICROSCOPYf_dihedral_angle_d12.864849
ELECTRON MICROSCOPYf_chiral_restr0.044913
ELECTRON MICROSCOPYf_plane_restr0.0061019

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