6L1M

Structure of human StAR-related lipid transfer protein 4 mutant - LWNI107-110GG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural analysis of human sterol transfer protein STARD4.

Tan, L.Tong, J.Chun, C.Im, Y.J.

(2019) Biochem Biophys Res Commun 520: 466-472

  • DOI: https://doi.org/10.1016/j.bbrc.2019.10.054
  • Primary Citation of Related Structures:  
    6L1D, 6L1M

  • PubMed Abstract: 

    The steroidogenic acute regulatory protein (StAR)-related lipid transfer domain-4 (STARD4) is a sterol-binding protein that is involved in cholesterol homeostasis by intracellular sterol transport. In this work, we determined the crystal structures of human STARD4 and its Ω1-loop mutant in apo forms at 1.95 and 1.7 Å resolutions, respectively. The structure of human STARD4 displays a conserved α-helix/β-grip fold containing a deep hydrophobic pocket. The Ω1-loop which serves as a lid for the hydrophobic pocket has a closed conformation. The shape of the sterol-binding cavity in the closed form is not complementary to accommodate cholesterol, suggesting that a conformational change of the Ω1-loop is essential for sterol binding. The human STARD4 displayed sterol transfer activity between liposomes, and the mutations in the Ω1-loop and the hydrophobic wall abolished the transfer activity. This study confirms the structural conservation of the STARD4 subfamily proteins and the flexibility of the Ω1-loop and helix α4 required for sterol transport.


  • Organizational Affiliation

    College of Pharmacy, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
StAR-related lipid transfer protein 4208Homo sapiensMutation(s): 1 
Gene Names: STARD4
UniProt & NIH Common Fund Data Resources
Find proteins for Q96DR4 (Homo sapiens)
Explore Q96DR4 
Go to UniProtKB:  Q96DR4
PHAROS:  Q96DR4
GTEx:  ENSG00000164211 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96DR4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.914α = 90
b = 43.357β = 90
c = 89.798γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Research Foundation (Korea)Korea, Republic OfNRF-2017R1A2B4004914

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-30
    Type: Initial release
  • Version 1.1: 2019-11-13
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description