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- PDB-6kwx: cryo-EM structure of human PA200 -

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Basic information

Entry
Database: PDB / ID: 6kwx
Titlecryo-EM structure of human PA200
ComponentsProteasome activator complex subunit 4
KeywordsHYDROLASE / Proteasome activator
Function / homology
Function and homology information


spermatoproteasome complex / sperm DNA condensation / peptidase activator activity / Proteasome assembly / proteasomal ubiquitin-independent protein catabolic process / proteasome binding / : / nuclear speck / DNA repair / DNA damage response ...spermatoproteasome complex / sperm DNA condensation / peptidase activator activity / Proteasome assembly / proteasomal ubiquitin-independent protein catabolic process / proteasome binding / : / nuclear speck / DNA repair / DNA damage response / nucleoplasm / nucleus / cytosol
Similarity search - Function
Proteasome activator complex subunit 4 C-terminal domain / Proteasome activator Blm10, mid region / Proteasome activator complex subunit 4 / : / Proteasome activator complex subunit 4-like, C-terminal / Proteasome activator complex subunit 4, mid HEAT repeats region / Proteasome activator complex subunit 4-like, HEAT repeat-like / Armadillo-like helical / Armadillo-type fold
Similarity search - Domain/homology
INOSITOL HEXAKISPHOSPHATE / Chem-K0W / Proteasome activator complex subunit 4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.75 Å
AuthorsOuyang, S. / Hongxin, G.
Funding support China, 1items
OrganizationGrant numberCountry
National Science Foundation (NSF, China)31770948 China
CitationJournal: PLoS Biol / Year: 2020
Title: Cryo-EM structures of the human PA200 and PA200-20S complex reveal regulation of proteasome gate opening and two PA200 apertures.
Authors: Hongxin Guan / Youwang Wang / Ting Yu / Yini Huang / Mianhuan Li / Abdullah F U H Saeed / Vanja Perčulija / Daliang Li / Jia Xiao / Dongmei Wang / Ping Zhu / Songying Ouyang /
Abstract: Proteasomes are highly abundant and conserved protease complexes that eliminate unwanted proteins in the cells. As a single-chain ATP-independent nuclear proteasome activator, proteasome activator ...Proteasomes are highly abundant and conserved protease complexes that eliminate unwanted proteins in the cells. As a single-chain ATP-independent nuclear proteasome activator, proteasome activator 200 (PA200) associates with 20S core particle to form proteasome complex that catalyzes polyubiquitin-independent degradation of acetylated histones, thus playing a pivotal role in DNA repair and spermatogenesis. Here, we present cryo-electron microscopy (cryo-EM) structures of the human PA200-20S complex and PA200 at 2.72 Å and 3.75 Å, respectively. PA200 exhibits a dome-like architecture that caps 20S and uses its C-terminal YYA (Tyr-Tyr-Ala) to induce the α-ring rearrangements and partial opening of the 20S gate. Our structural data also indicate that PA200 has two openings formed by numerous positively charged residues that respectively bind (5,6)-bisdiphosphoinositol tetrakisphosphate (5,6[PP]2-InsP4) and inositol hexakisphosphate (InsP6) and are likely to be the gates that lead unfolded proteins through PA200 and into the 20S. Besides, our structural analysis of PA200 found that the bromodomain (BRD)-like (BRDL) domain of PA200 shows considerable sequence variation in comparison to other human BRDs, as it contains only 82 residues because of a short ZA loop, and cannot be classified into any of the eight typical human BRD families. Taken together, the results obtained from this study provide important insights into human PA200-induced 20S gate opening for substrate degradation and the opportunities to explore the mechanism for its recognition of H4 histone in acetylation-mediated proteasomal degradation.
History
DepositionSep 9, 2019Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Apr 1, 2020Provider: repository / Type: Initial release
Revision 2.0Oct 14, 2020Group: Advisory / Atomic model ...Advisory / Atomic model / Author supporting evidence / Data collection / Derived calculations / Non-polymer description / Structure summary
Category: atom_site / chem_comp ...atom_site / chem_comp / entity / pdbx_entity_instance_feature / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_validate_close_contact / struct_site
Item: _atom_site.Cartn_x / _atom_site.Cartn_y ..._atom_site.Cartn_x / _atom_site.Cartn_y / _atom_site.Cartn_z / _atom_site.auth_atom_id / _atom_site.auth_comp_id / _atom_site.label_atom_id / _atom_site.label_comp_id / _atom_site.type_symbol / _chem_comp.id / _chem_comp.name / _chem_comp.pdbx_synonyms / _entity.pdbx_description / _pdbx_entity_instance_feature.auth_comp_id / _pdbx_entity_instance_feature.comp_id / _pdbx_entity_nonpoly.comp_id / _pdbx_entity_nonpoly.name / _pdbx_nonpoly_scheme.mon_id / _pdbx_nonpoly_scheme.pdb_mon_id / _pdbx_validate_close_contact.auth_atom_id_2 / _pdbx_validate_close_contact.auth_comp_id_2 / _struct_site.details / _struct_site.pdbx_auth_comp_id
Revision 2.1Mar 27, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Assembly

Deposited unit
A: Proteasome activator complex subunit 4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)217,2553
Polymers215,7751
Non-polymers1,4802
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area0 Å2
ΔGint0 kcal/mol
Surface area71350 Å2

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Components

#1: Protein Proteasome activator complex subunit 4 / Proteasome activator PA200


Mass: 215774.875 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: PSME4, KIAA0077 / Production host: Homo sapiens (human) / References: UniProt: Q14997
#2: Chemical ChemComp-K0W / [(1~{S},2~{R},3~{R},4~{S},5~{S},6~{R})-2-[oxidanyl(phosphonooxy)phosphoryl]oxy-3,4,5,6-tetraphosphonooxy-cyclohexyl] phosphono hydrogen phosphate


Mass: 819.995 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H20O30P8 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-IHP / INOSITOL HEXAKISPHOSPHATE / MYO-INOSITOL HEXAKISPHOSPHATE / INOSITOL 1,2,3,4,5,6-HEXAKISPHOSPHATE


Mass: 660.035 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H18O24P6 / Feature type: SUBJECT OF INVESTIGATION
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: human PA200 / Type: CELL / Entity ID: #1 / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding 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: OTHER
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 3.75 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 103000 / Symmetry type: POINT

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