2LTH

NMR structure of major ampullate spidroin 1 N-terminal domain at pH 5.5


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Sequential pH-driven dimerization and stabilization of the N-terminal domain enables rapid spider silk formation.

Kronqvist, N.Otikovs, M.Chmyrov, V.Chen, G.Andersson, M.Nordling, K.Landreh, M.Sarr, M.Jornvall, H.Wennmalm, S.Widengren, J.Meng, Q.Rising, A.Otzen, D.Knight, S.D.Jaudzems, K.Johansson, J.

(2014) Nat Commun 5: 3254-3254

  • DOI: https://doi.org/10.1038/ncomms4254
  • Primary Citation of Related Structures:  
    2LTH

  • PubMed Abstract: 

    The mechanisms controlling the conversion of spider silk proteins into insoluble fibres, which happens in a fraction of a second and in a defined region of the silk glands, are still unresolved. The N-terminal domain changes conformation and forms a homodimer when pH is lowered from 7 to 6; however, the molecular details still remain to be determined. Here we investigate site-directed mutants of the N-terminal domain from Euprosthenops australis major ampullate spidroin 1 and find that the charged residues D40, R60 and K65 mediate intersubunit electrostatic interactions. Protonation of E79 and E119 is required for structural conversions of the subunits into a dimer conformation, and subsequent protonation of E84 around pH 5.7 leads to the formation of a fully stable dimer. These residues are highly conserved, indicating that the now proposed three-step mechanism prevents premature aggregation of spidroins and enables fast formation of spider silk fibres in general.


  • Organizational Affiliation

    KI Alzheimer Disease Research Centre, NVS Department, Karolinska Institutet, Novum, 5th floor, SE-141 86 Stockholm, Sweden.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Major ampullate spidroin 1
A, B
137Euprosthenops australisMutation(s): 0 
Gene Names: MaSp1
UniProt
Find proteins for Q05H60 (Euprosthenops australis)
Explore Q05H60 
Go to UniProtKB:  Q05H60
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ05H60
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-27
    Type: Initial release
  • Version 1.1: 2014-03-26
    Changes: Database references
  • Version 1.2: 2023-06-14
    Changes: Data collection, Database references, Other