C. albicans actin interacting protein Aip5

Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.265 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Orchestrated actin nucleation by the Candida albicans polarisome complex enables filamentous growth.

Xie, Y.Loh, Z.Y.Xue, J.Zhou, F.Sun, J.Qiao, Z.Jin, S.Deng, Y.Li, H.Wang, Y.Lu, L.Gao, Y.Miao, Y.

(2020) J Biol Chem 295: 14840-14854

  • DOI: https://doi.org/10.1074/jbc.RA120.013890
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Candida albicans is a dimorphic fungus that converts from a yeast form to a hyphae form during infection. This switch requires the formation of actin cable to coordinate polarized cell growth. It's known that nucleation of this cable requires a multiprotein complex localized at the tip called the polarisome, but the mechanisms underpinning this process were unclear. Here, we found that C. albicans Aip5, a homolog of polarisome component ScAip5 in Saccharomyces cerevisiae that nucleates actin polymerization and synergizes with the formin ScBni1, regulates actin assembly and hyphae growth synergistically with other polarisome proteins Bni1, Bud6, and Spa2. The C terminus of Aip5 binds directly to G-actin, Bni1, and the C-terminal of Bud6, which form the core of the nucleation complex to polymerize F-actin. Based on insights from structural biology and molecular dynamic simulations, we propose a possible complex conformation of the actin nucleation core, which provides cooperative positioning and supports the synergistic actin nucleation activity of a tri-protein complex Bni1-Bud6-Aip5. Together with known interactions of Bni1 with Bud6 and Aip5 in S. cerevisiae , our findings unravel molecular mechanisms of C. albicans by which the tri-protein complex coordinates the actin nucleation in actin cable assembly and hyphal growth, which is likely a conserved mechanism in different filamentous fungi and yeast.

  • Organizational Affiliation

    School of Biological Sciences, Nanyang Technological University, Singapore.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
C. albicans actin interacting protein Aip598Candida albicans SC5314Mutation(s): 0 
Gene Names: orf19.92CAALFM_C600910CA
Find proteins for A0A1D8PPH3 (Candida albicans (strain SC5314 / ATCC MYA-2876))
Explore A0A1D8PPH3 
Go to UniProtKB:  A0A1D8PPH3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1D8PPH3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.65 Å
  • R-Value Free: 0.306 
  • R-Value Work: 0.259 
  • R-Value Observed: 0.265 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 95.116α = 90
b = 95.116β = 90
c = 74.119γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Ministry of Education (MoE, Singapore)Singapore--

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-26
    Type: Initial release
  • Version 1.1: 2020-09-09
    Changes: Database references
  • Version 1.2: 2020-09-16
    Changes: Database references
  • Version 1.3: 2020-11-18
    Changes: Database references
  • Version 1.4: 2023-11-29
    Changes: Data collection, Database references, Refinement description