2Q20

Structure of the germline Vk1 O18/O8 light chain variable domain homodimer


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.119 
  • R-Value Observed: 0.120 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Altered dimer interface decreases stability in an amyloidogenic protein.

Baden, E.M.Owen, B.A.Peterson, F.C.Volkman, B.F.Ramirez-Alvarado, M.Thompson, J.R.

(2008) J Biol Chem 283: 15853-15860

  • DOI: https://doi.org/10.1074/jbc.M705347200
  • Primary Citation of Related Structures:  
    2Q1E, 2Q20

  • PubMed Abstract: 

    Amyloidoses are devastating and currently incurable diseases in which the process of amyloid formation causes fatal cellular and organ damage. The molecular mechanisms underlying amyloidoses are not well known. In this study, we address the structural basis of immunoglobulin light chain amyloidosis, which results from deposition of light chains produced by clonal plasma cells. We compare light chain amyloidosis protein AL-09 to its wild-type counterpart, the kappaI O18/O8 light chain germline. Crystallographic studies indicate that both proteins form dimers. However, AL-09 has an altered dimer interface that is rotated 90 degrees from the kappaI O18/O8 dimer interface. The three non-conservative mutations in AL-09 are located within the dimer interface, consistent with their role in the decreased stability of this amyloidogenic protein. Moreover, AL-09 forms amyloid fibrils more quickly than kappaI O18/O8 in vitro. These results support the notion that the increased stability of the monomer and delayed fibril formation, together with a properly formed dimer, may be protective against amyloidogenesis. This could open a new direction into rational drug design for amyloidogenic proteins.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, College of Medicine, Mayo Clinic, Rochester, Minnesota 55905, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Vk1 O18/O8 germline light chain variable domain
A, B
109Homo sapiensMutation(s): 0 
Gene Names: Vk1 O18/O8 light chain germline
UniProt & NIH Common Fund Data Resources
Find proteins for P01594 (Homo sapiens)
Explore P01594 
Go to UniProtKB:  P01594
GTEx:  ENSG00000242076 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01594
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.30 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.119 
  • R-Value Observed: 0.120 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.265α = 90
b = 74.265β = 90
c = 99.051γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
SBC-Collectdata collection
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-18
    Changes: Refinement description
  • Version 1.3: 2023-08-30
    Changes: Data collection, Database references, Refinement description