Crystal structure of C1QL2

Experimental Data Snapshot

  • Resolution: 2.38 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 

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Structures of C1q-like Proteins Reveal Unique Features among the C1q/TNF Superfamily.

Ressl, S.Vu, B.K.Vivona, S.Martinelli, D.C.Sudhof, T.C.Brunger, A.T.

(2015) Structure 23: 688-699

  • DOI: https://doi.org/10.1016/j.str.2015.01.019
  • Primary Citation of Related Structures:  
    4QPY, 4QQ2, 4QQH, 4QQL, 4QQO, 4QQP

  • PubMed Abstract: 

    C1q-like (C1QL) -1, -2, and -3 proteins are encoded by homologous genes that are highly expressed in brain. C1QLs bind to brain-specific angiogenesis inhibitor 3 (BAI3), an adhesion-type G-protein coupled receptor that may regulate dendritic morphology by organizing actin filaments. To begin to understand the function of C1QLs, we determined high-resolution crystal structures of the globular C1q-domains of C1QL1, C1QL2, and C1QL3. Each structure is a trimer, with each protomer forming a jelly-roll fold consisting of 10 β strands. Moreover, C1QL trimers may assemble into higher-order oligomers similar to adiponectin and contain four Ca(2+)-binding sites along the trimeric symmetry axis, as well as additional surface Ca(2+)-binding sites. Mutation of Ca(2+)-coordinating residues along the trimeric symmetry axis lowered the Ca(2+)-binding affinity and protein stability. Our results reveal unique structural features of C1QLs among C1q/TNF superfamily proteins that may be associated with their specific brain functions.

  • Organizational Affiliation

    Department of Molecular and Cellular Physiology, Stanford University, Stanford, CA 94305, USA; Howard Hughes Medical Institute, Stanford, CA 94305, USA; Departments of Neurology and Neurological Sciences, Photon Science, and Structural Biology, Stanford University, Stanford, CA 94305, USA. Electronic address: brunger@stanford.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Complement C1q-like protein 2
A, B, C
136Mus musculusMutation(s): 0 
Gene Names: C1ql2C1qtnf10Ctrp10
UniProt & NIH Common Fund Data Resources
Find proteins for Q8CFR0 (Mus musculus)
Explore Q8CFR0 
Go to UniProtKB:  Q8CFR0
IMPC:  MGI:3032521
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8CFR0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.38 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 
  • Space Group: F 4 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 225.62α = 90
b = 225.62β = 90
c = 225.62γ = 90
Software Package:
Software NamePurpose
Blu-Icedata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-04-15
    Type: Initial release
  • Version 1.1: 2015-05-06
    Changes: Database references