2VB5

Solution structure of W60G mutant of human beta2-microglobulin


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The Controlling Roles of Trp60 and Trp95 in Beta2-Microglobulin Function, Folding and Amyloid Aggregation Properties.

Esposito, G.Ricagno, S.Corazza, A.Rennella, E.Gumral, D.Mimmi, M.C.Betto, E.Pucillo, C.E.M.Fogolari, F.Viglino, P.Raimondi, S.Giorgetti, S.Bolognesi, B.Merlini, G.Stoppini, M.Bolognesi, M.Bellotti, V.

(2008) J Mol Biol 378: 885

  • DOI: 10.1016/j.jmb.2008.03.002
  • Primary Citation of Related Structures:  
    2VB5, 2Z9T

  • PubMed Abstract: 
  • Amyloidosis associated to hemodialysis is caused by persistently high beta(2)-microglobulin (beta(2)m) serum levels. beta(2)m is an intrinsically amyloidogenic protein whose capacity to assemble into amyloid fibrils in vitro and in vivo is concentration dependent; no beta(2)m genetic variant is known in the human population ...

    Amyloidosis associated to hemodialysis is caused by persistently high beta(2)-microglobulin (beta(2)m) serum levels. beta(2)m is an intrinsically amyloidogenic protein whose capacity to assemble into amyloid fibrils in vitro and in vivo is concentration dependent; no beta(2)m genetic variant is known in the human population. We investigated the roles of two evolutionary conserved Trp residues in relation to beta(2)m structure, function and folding/misfolding by means of a combined biophysical and functional approach. We show that Trp60 plays a functional role in promoting the association of beta(2)m in class I major histocompatibility complex; it is exposed to the solvent at the apex of a protein loop in order to accomplish such function. The Trp60-->Gly mutation has a threefold effect: it stabilizes beta(2)m, inhibits beta(2)m amyloidogenic propensity and weakens the interaction with the class I major histocompatibility complex heavy chain. On the contrary, Trp95 is buried in the beta(2)m core; the Trp95-->Gly mutation destabilizes the protein, which is unfolded in solution, yielding nonfibrillar beta(2)m aggregates. Trp60 and Trp95 therefore play differential and complementary roles in beta(2)m, being relevant for function (Trp60) and for maintenance of a properly folded structure (Trp95) while affecting in distinct ways the intrinsic propensity of wild-type beta(2)m towards self-aggregation into amyloid fibrils.


    Organizational Affiliation

    Department of Biomedical Science and Technology, University of Udine, Piazzale Kolbe 4, 33100 Udine, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-2-MICROGLOBULINA100Homo sapiensMutation(s): 1 
Gene Names: B2MCDABP0092HDCMA22P
UniProt & NIH Common Fund Data Resources
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
PHAROS:  P61769
Entity Groups  
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UniProt GroupP61769
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

Structure Validation

View Full Validation Report



Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2007-09-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-01-15
    Changes: Data collection, Other