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- PDB-8v3q: Structure of CCP5 class1 -

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Basic information

Entry
Database: PDB / ID: 8v3q
TitleStructure of CCP5 class1
Components
  • Cytosolic carboxypeptidase-like protein 5
  • beta tubulin tail
KeywordsHYDROLASE/SUBSTRATE / carboxypeptidase / deglutamylation / branch glutamate removal / microtubule / HYDROLASE / HYDROLASE-SUBSTRATE complex
Function / homology
Function and homology information


tubulin-glutamate carboxypeptidase / protein deglutamylation / protein side chain deglutamylation / protein branching point deglutamylation / C-terminal protein deglutamylation / Carboxyterminal post-translational modifications of tubulin / metallocarboxypeptidase activity / intercellular bridge / Hydrolases; Acting on peptide bonds (peptidases); Metallocarboxypeptidases / tubulin binding ...tubulin-glutamate carboxypeptidase / protein deglutamylation / protein side chain deglutamylation / protein branching point deglutamylation / C-terminal protein deglutamylation / Carboxyterminal post-translational modifications of tubulin / metallocarboxypeptidase activity / intercellular bridge / Hydrolases; Acting on peptide bonds (peptidases); Metallocarboxypeptidases / tubulin binding / mitotic spindle / microtubule cytoskeleton / midbody / defense response to virus / proteolysis / zinc ion binding / nucleus / cytosol / cytoplasm
Similarity search - Function
Cytosolic carboxypeptidase-like protein 5 catalytic domain / Cytosolic carboxypeptidase, N-terminal / : / Cytosolic carboxypeptidase N-terminal domain / Peptidase family M14 domain profile. / Peptidase M14, carboxypeptidase A / Zinc carboxypeptidase
Similarity search - Domain/homology
GLUTAMIC ACID / Cytosolic carboxypeptidase-like protein 5
Similarity search - Component
Biological speciesHomo sapiens (human)
Sus scrofa (pig)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsChen, J. / Zehr, E.A. / Gruschus, J.M. / Szyk, A. / Liu, Y. / Tanner, M.E. / Tjandra, N. / Roll-Mecak, A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)1ZIANS003163 United States
CitationJournal: Nature / Year: 2024
Title: Tubulin code eraser CCP5 binds branch glutamates by substrate deformation.
Authors: Jiayi Chen / Elena A Zehr / James M Gruschus / Agnieszka Szyk / Yanjie Liu / Martin E Tanner / Nico Tjandra / Antonina Roll-Mecak /
Abstract: Microtubule function is modulated by the tubulin code, diverse posttranslational modifications that are altered dynamically by writer and eraser enzymes. Glutamylation-the addition of branched ...Microtubule function is modulated by the tubulin code, diverse posttranslational modifications that are altered dynamically by writer and eraser enzymes. Glutamylation-the addition of branched (isopeptide-linked) glutamate chains-is the most evolutionarily widespread tubulin modification. It is introduced by tubulin tyrosine ligase-like enzymes and erased by carboxypeptidases of the cytosolic carboxypeptidase (CCP) family. Glutamylation homeostasis, achieved through the balance of writers and erasers, is critical for normal cell function, and mutations in CCPs lead to human disease. Here we report cryo-electron microscopy structures of the glutamylation eraser CCP5 in complex with the microtubule, and X-ray structures in complex with transition-state analogues. Combined with NMR analysis, these analyses show that CCP5 deforms the tubulin main chain into a unique turn that enables lock-and-key recognition of the branch glutamate in a cationic pocket that is unique to CCP family proteins. CCP5 binding of the sequences flanking the branch point primarily through peptide backbone atoms enables processing of diverse tubulin isotypes and non-tubulin substrates. Unexpectedly, CCP5 exhibits inefficient processing of an abundant β-tubulin isotype in the brain. This work provides an atomistic view into glutamate branch recognition and resolution, and sheds light on homeostasis of the tubulin glutamylation syntax.
History
DepositionNov 28, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 17, 2024Provider: repository / Type: Initial release
Revision 1.1Jul 31, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _em_admin.last_update
Revision 1.2Aug 7, 2024Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update
Revision 1.3Nov 20, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Cytosolic carboxypeptidase-like protein 5
M: beta tubulin tail
hetero molecules


Theoretical massNumber of molelcules
Total (without water)69,2704
Polymers69,0582
Non-polymers2132
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Cytosolic carboxypeptidase-like protein 5


Mass: 68229.547 Da / Num. of mol.: 1 / Fragment: residues 2-605 / Mutation: E516A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: AGBL5 / Plasmid: pFastBac / Details (production host): His6_MBP_Asn10_TEV / Cell line (production host): Sf9 / Production host: Spodoptera frugiperda (fall armyworm) / Strain (production host): IPLB-Sf-21-AE / References: UniProt: Q8NDL9
#2: Protein/peptide beta tubulin tail


Mass: 827.967 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig) / Organ: brain
#3: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Zn
#4: Chemical ChemComp-GLU / GLUTAMIC ACID


Type: L-peptide linking / Mass: 147.129 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Formula: C5H9NO4
Has ligand of interestY
Has protein modificationY

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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: CCP5 in complex with beta tubulin tail / Type: COMPLEX
Details: Focused refinement of CCP5:microtubule class#1 structure
Entity ID: #1 / Source: MULTIPLE SOURCES
Molecular weightExperimental value: NO
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPESC8H18N2O4S1
2150 mMpotassium chlorideKCl1
31 mMTCEPC9H15O6P1
SpecimenConc.: 0.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Au-flat 1.2/1.3
VitrificationInstrument: LEICA EM GP / Cryogen name: ETHANE / Humidity: 90 % / Chamber temperature: 303 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 FIELD / Nominal magnification: 135000 X / Nominal defocus max: 2200 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 1.651 sec. / Electron dose: 53.34 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)
EM imaging opticsEnergyfilter slit width: 20 eV

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Processing

EM software
IDNameVersionCategory
7UCSF Chimeramodel fitting
9PHENIX1.20.1-4487model refinement
13RELION3.0.83D reconstruction
CTF correctionType: NONE
Particle selectionNum. of particles selected: 162521
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 239249 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL / Target criteria: Cross-correlation coefficient
Atomic model buildingDetails: crystal structure of apo CCP5 / Source name: Other / Type: experimental model
RefinementCross valid method: NONE

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