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AMNE:(NATURVETENSKAP Biologi Strukturbiologi)
 

Sökning: AMNE:(NATURVETENSKAP Biologi Strukturbiologi) > Crystal Structure o...

  • Stenmark, PålStockholms universitet,Institutionen för biokemi och biofysik (författare)

Crystal Structure of the Botulinum Neurotoxin Type G Binding Domain : Insight into Cell Surface Binding

  • Artikel/kapitelEngelska2010

Förlag, utgivningsår, omfång ...

  • Elsevier BV,2010
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:su-50129
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-50129URI
  • https://doi.org/10.1016/j.jmb.2010.02.041DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • authorCount :5
  • Botulinum neurotoxins (BoNTs) typically bind the neuronal cell surface via dual interactions with both protein receptors and gangliosides. We present here the 1.9-angstrom X-ray structure of the BoNT serotype G (BoNT/G) receptor binding domain (residues 868-1297) and a detailed view of protein receptor and ganglioside binding regions. The ganglioside binding motif (SxWY) has a conserved structure compared to the corresponding regions in BoNT serotype A and BoNT serotype B (BoNT/B), but several features of interactions with the hydrophilic face of the ganglioside are absent at the opposite side of the motif in the BoNT/G ganglioside binding cleft. This may significantly reduce the affinity between BoNT/G and gangliosides. BoNT/G and BoNT/B share the protein receptor synaptotagmin (Syt) I/II. The Syt binding site has a conserved hydrophobic plateau located centrally in the proposed protein receptor binding interface (Tyr1189, Phe1202, Ala1204, Pro1205, and Phe1212). Interestingly, only 5 of 14 residues that are important for binding between Syt-II and BoNT/B are conserved in BoNT/G, suggesting that the means by which BoNT/G and BoNT/B bind Syt diverges more than previously appreciated. Indeed, substitution of Syt-II Phe47 and Phe55 with alanine residues had little effect on the binding of BoNT/G, but strongly reduced the binding of BoNT/B. Furthermore, an extended solvent-exposed hydrophobic loop, located between the Syt binding site and the ganglioside binding cleft, may serve as a third membrane association and binding element to contribute to high-affinity binding to the neuronal membrane. While BoNT/G and BoNT/B are homologous to each other and both utilize Syt-I/Syt-II as their protein receptor, the precise means by which these two toxin serotypes bind to Syt appears surprisingly divergent.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Dong, Min (författare)
  • Dupuy, Jerome (författare)
  • Chapman, Edwin R. (författare)
  • Stevens, Raymond C. (författare)
  • Stockholms universitetInstitutionen för biokemi och biofysik (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Journal of Molecular Biology: Elsevier BV397:5, s. 1287-12970022-28361089-8638

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