4XU4

Crystal structure of a mycobacterial Insig homolog MvINS from Mycobacterium vanbaalenii at 1.9A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.901 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

PROTEIN STRUCTURE. Crystal structure of a mycobacterial Insig homolog provides insight into how these sensors monitor sterol levels

Ren, R.Zhou, X.He, Y.Ke, M.Wu, J.Liu, X.Yan, C.Wu, Y.Gong, X.Lei, X.Yan, S.F.Radhakrishnan, A.Yan, N.

(2015) Science 349: 187-191

  • DOI: 10.1126/science.aab1091
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Insulin-induced gene 1 (Insig-1) and Insig-2 are endoplasmic reticulum membrane-embedded sterol sensors that regulate the cellular accumulation of sterols. Despite their physiological importance, the structural information on Insigs remains limited. ...

    Insulin-induced gene 1 (Insig-1) and Insig-2 are endoplasmic reticulum membrane-embedded sterol sensors that regulate the cellular accumulation of sterols. Despite their physiological importance, the structural information on Insigs remains limited. Here we report the high-resolution structures of MvINS, an Insig homolog from Mycobacterium vanbaalenii. MvINS exists as a homotrimer. Each protomer comprises six transmembrane segments (TMs), with TM3 and TM4 contributing to homotrimerization. The six TMs enclose a V-shaped cavity that can accommodate a diacylglycerol molecule. A homology-based structural model of human Insig-2, together with biochemical characterizations, suggest that the central cavity of Insig-2 accommodates 25-hydroxycholesterol, whereas TM3 and TM4 engage in Scap binding. These analyses provide an important framework for further functional and mechanistic understanding of Insig proteins and the sterol regulatory element-binding protein pathway.


    Organizational Affiliation

    State Key Laboratory of Membrane Biology, Tsinghua University, Beijing 100084, China. Center for Structural Biology, School of Life Sciences, School of Medicine, Tsinghua University, Beijing 100084, China. Tsinghua-Peking Center for Life Sciences, Tsinghua University, Beijing 100084, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein
A
210Mycobacterium vanbaalenii (strain DSM 7251 / PYR-1)Mutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Insulin-Induced Gene Products: Insig Proteins
Protein: 
MvINS Insig homolog
Find proteins for A1T557 (Mycobacterium vanbaalenii (strain DSM 7251 / PYR-1))
Go to UniProtKB:  A1T557
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DDQ
Query on DDQ

Download SDF File 
Download CCD File 
A
DECYLAMINE-N,N-DIMETHYL-N-OXIDE
C12 H27 N O
ZRKZFNZPJKEWPC-UHFFFAOYSA-N
 Ligand Interaction
BNG
Query on BNG

Download SDF File 
Download CCD File 
A
B-NONYLGLUCOSIDE
C15 H30 O6
QFAPUKLCALRPLH-UXXRCYHCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.901 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.185 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 85.498α = 90.00
b = 85.498β = 90.00
c = 125.851γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
HKL-2000data scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-10-14
    Type: Initial release