1C28

THE CRYSTAL STRUCTURE OF A COMPLMENT-1Q FAMILY PROTEIN SUGGESTS AN EVOLUTIONARY LINK TO TUMOR NECROSIS FACTOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The crystal structure of a complement-1q family protein suggests an evolutionary link to tumor necrosis factor.

Shapiro, L.Scherer, P.E.

(1998) Curr.Biol. 8: 335-338


  • PubMed Abstract: 
  • ACRP30--adipocyte complement-related protein of 30 kDa or AdipoQ--is an abundant serum protein, secreted exclusively from fat cells, which is implicated in energy homeostasis and obesity [1,2]. ACRP30 is a close homologue of the complement protein C1 ...

    ACRP30--adipocyte complement-related protein of 30 kDa or AdipoQ--is an abundant serum protein, secreted exclusively from fat cells, which is implicated in energy homeostasis and obesity [1,2]. ACRP30 is a close homologue of the complement protein C1q, which is involved in the recognition of microbial surfaces [3-5] and antibody-antigen complexes [6,7] in the classical pathway of complement. We have determined the crystal structure of a homotrimeric fragment from ACRP30 at 2.1 A resolution. The structure reveals an unexpected homology to the tumor necrosis factor (TNF) family. Identical folding topologies, key residue conservations, and similarity of trimer interfaces and intron positions firmly establish an evolutionary link between the TNF and C1q families. We suggest that TNFs--which control many aspects of inflammation, adaptive immunity, apoptosis and energy homeostasis--arose by divergence from a primordial recognition molecule of the innate immune system. The evolutionary connection between C1q-like proteins and TNFs illuminates the shared functions of these two important groups of proteins.


    Organizational Affiliation

    Department of Physiology and Biophysics, Mount Sinai School of Medicine, New York, New York 10029, USA. shapiro@convex.hhmi.columbia.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (30 KD ADIPOCYTE COMPLEMENT-RELATED PROTEIN PRECURSOR (ACRP30))
A, B, C
135Mus musculusGene Names: Adipoq (Acdc, Acrp30, Apm1)
Find proteins for Q60994 (Mus musculus)
Go to UniProtKB:  Q60994
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.212 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 112.300α = 90.00
b = 112.300β = 90.00
c = 71.600γ = 120.00
Software Package:
Software NamePurpose
MLPHAREphasing
DENZOdata reduction
SCALEPACKdata scaling
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-08-04
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-31
    Type: Experimental preparation