Biological Assembly 1  

 3D View: Structure

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 40-mer - A40 

Biological assembly 1 assigned by authors and generated by (software)

Macromolecule Content

• Total Structure Weight: 173337.39 
• Atom Count: 11682 
• Residue Count: 1528 
• Unique protein chains: 1

4CKG

Helical reconstruction of ACAP1(BAR-PH domain) decorated membrane tubules by cryo-electron microscopy

• DOI: 10.2210/pdb4CKG/pdb
• EMDataResource: EMD-2546

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2014-01-06 Released: 2014-10-15 
• Deposition Author(s): Pang, X.Y., Fan, J., Zhang, Y., Zhang, K., Gao, B.Q., Ma, J., Li, J., Deng, Y.C., Zhou, Q.J., Hsu, V., Sun, F.

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 15 Å
• Aggregation State: HELICAL ARRAY 
• Reconstruction Method: HELICAL 

Literature

A Ph Domain in Acap1 Possesses Key Features of the Bar Domain in Promoting Membrane Curvature.

Pang, X., Fan, J., Zhang, Y., Zhang, K., Gao, B., Ma, J., Li, J., Deng, Y., Zhou, Q., Egelman, E.H., Hsu, V.W., Sun, F.

(2014) Dev.Cell 31: 73

• PubMed: 25284369 
• DOI: 10.1016/j.devcel.2014.08.020
• Primary Citation of Related Structures:  
  4NSW, 4CKH


• PubMed Abstract: 
  

The BAR (Bin-Amphiphysin-Rvs) domain undergoes dimerization to produce a curved protein structure, which superimposes onto membrane through electrostatic interactions to sense and impart membrane curvature. In some cases, a BAR domain also possesses an amphipathic helix that inserts into the membrane to induce curvature. ACAP1 (Arfgap with Coil coil, Ankyrin repeat, and PH domain protein 1) contains a BAR domain. Here, we show that this BAR domain can neither bind membrane nor impart curvature, but instead requires a neighboring PH (Pleckstrin Homology) domain to achieve these functions. Specific residues within the PH domain are responsible for both membrane binding and curvature generation. The BAR domain adjacent to the PH domain instead interacts with the BAR domains of neighboring ACAP1 proteins to enable clustering at the membrane. Thus, we have uncovered the molecular basis for an unexpected and unconventional collaboration between PH and BAR domains in membrane bending.

---

Organizational Affiliation: 

National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ARF-GAP WITH COILED-COIL, ANK REPEAT AND PH DOMAIN-CONTAINING PROTEIN 1	A, B, C, D	382	Homo sapiens	Mutation(s): 0  Gene Names: ACAP1 (CENTB1, KIAA0050)
Find proteins for Q15027 (Homo sapiens) Go to Gene View: ACAP1 Go to UniProtKB:  Q15027

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 15 Å
• Aggregation State: HELICAL ARRAY 
• Reconstruction Method: HELICAL 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-01-06 
• Released Date: 2014-10-15 
• Deposition Author(s): Pang, X.Y., Fan, J., Zhang, Y., Zhang, K., Gao, B.Q., Ma, J., Li, J., Deng, Y.C., Zhou, Q.J., Hsu, V., Sun, F.

Revision History 

• Version 1.0: 2014-10-15
  Type: Initial release
• Version 1.1: 2014-10-22
  Type: Database references
• Version 1.2: 2017-08-30
  Type: Data collection, Derived calculations, Refinement description
• Version 1.3: 2019-01-23
  Type: Advisory, Data collection, Derived calculations