8V2J | pdb_00008v2j

Structure of alpha1B and betaI/IVb microtubule bound to GDP

• PDB DOI: https://doi.org/10.2210/pdb8V2J/pdb
• EM Map EMD-42916: EMDB EMDataResource

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 2023-11-22 Released: 2024-11-27 
• Deposition Author(s): Zehr, E.A., Roll-Mecak, A.
• Funding Organization(s): National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.90 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental

Literature

Cryo-EM structures of human alpha 1B/ beta I+ beta IVb microtubules shed light on isoform specific assembly

Zehr, E.A., Roll-Mecak, A.

(2023) bioRxiv 

• DOI: https://doi.org/10.1101/2023.12.01.569594

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A2B2 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 201.83 kDa 
• Atom Count: 13,580 
• Modeled Residue Count: 1,732 
• Deposited Residue Count: 1,790 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tubulin beta chain	A [auth B], B [auth E]	444	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P07437 (Homo sapiens) Explore P07437  Go to UniProtKB:  P07437
PHAROS:  P07437 GTEx:  ENSG00000196230

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Tubulin alpha-1B chain	C [auth A], D	451	Homo sapiens	Mutation(s): 0  EC: 3.6.5
UniProt & NIH Common Fund Data Resources
Find proteins for P68363 (Homo sapiens) Explore P68363  Go to UniProtKB:  P68363
PHAROS:  P68363 GTEx:  ENSG00000123416

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GTP	G [auth A], I [auth D]	GUANOSINE-5'-TRIPHOSPHATE C10 H16 N5 O14 P3 XKMLYUALXHKNFT-UUOKFMHZSA-N
GDP	E [auth B], F [auth E]	GUANOSINE-5'-DIPHOSPHATE C10 H15 N5 O11 P2 QGWNDRXFNXRZMB-UUOKFMHZSA-N
MG	H [auth A], J [auth D]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.90 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.20.1_4487:

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2024-11-27 
Deposition Author(s): Zehr, E.A., Roll-Mecak, A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)	United States	NS003164

Revision History  

• Version 1.0: 2024-11-27
  Type: Initial release
  
• Version 1.1: 2025-06-11
  Changes: Data collection, Database references