1HX8

CRYSTAL STRUCTURE OF N-TERMINAL DOMAIN OF DROSOPHILA AP180

• PDB DOI:  https://doi.org/10.2210/pdb1HX8/pdb

• Classification: ENDOCYTOSIS/EXOCYTOSIS
• Organism(s): Drosophila melanogaster
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2001-01-12 Released: 2001-02-28 
• Deposition Author(s): Mao, Y., Chen, J., Maynard, J.A., Zhang, B., Quiocho, F.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.253 
• R-Value Work: 0.211 
• R-Value Observed: 0.221 

Literature

A novel all helix fold of the AP180 amino-terminal domain for phosphoinositide binding and clathrin assembly in synaptic vesicle endocytosis.

Mao, Y., Chen, J., Maynard, J.A., Zhang, B., Quiocho, F.A.

(2001) Cell 104: 433-440

• PubMed: 11239400 
• DOI: https://doi.org/10.1016/s0092-8674(01)00230-6
• Primary Citation of Related Structures:  
  1HX8


• PubMed Abstract: 
  

Clathrin-mediated endocytosis plays a major role in retrieving synaptic vesicles from the plasma membrane following exocytosis. This endocytic process requires AP180 (or a homolog), which promotes the assembly and restricts the size of clathrin-coated vesicles. The highly conserved 33 kDa amino-terminal domain of AP180 plays a critical role in binding to phosphoinositides and in regulating the clathrin assembly activity of AP180. The crystal structure of the amino-terminal domain reported herein reveals a novel fold consisting of a large double layer of sheets of ten alpha helices and a unique site for binding phosphoinositides. The finding that the clathrin-box motif is mostly buried and lies in a helix indicates a different site and mechanism for binding of the domain to clathrins than previously assumed.

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Organizational Affiliation: 

Structural and Computational Biology and Molecular Biophysics Graduate Program, Baylor College of Medicine, Houston, TX 77030, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 67.49 kDa 
• Atom Count: 4,432 
• Modelled Residue Count: 539 
• Deposited Residue Count: 598 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
SYNAPSE-ENRICHED CLATHRIN ADAPTOR PROTEIN LAP	A, B	299	Drosophila melanogaster	Mutation(s): 0  Gene Names: lap, CG2520
UniProt
Find proteins for Q9VI75 (Drosophila melanogaster) Explore Q9VI75  Go to UniProtKB:  Q9VI75

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A], D [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.253 
• R-Value Work: 0.211 
• R-Value Observed: 0.221 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 105.632	α = 90
b = 106.933	β = 119.3
c = 79.207	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-02-28 
Deposition Author(s): Mao, Y., Chen, J., Maynard, J.A., Zhang, B., Quiocho, F.A.

Revision History  

• Version 1.0: 2001-02-28
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance