Journal of Biomolecular NMR

, Volume 42, Issue 1, pp 23–33 | Cite as

Automated amino acid side-chain NMR assignment of proteins using 13C- and 15N-resolved 3D [1H,1H]-NOESY

  • Francesco Fiorito
  • Torsten Herrmann
  • Fred F. Damberger
  • Kurt Wüthrich
Article

Abstract

ASCAN is a new algorithm for automatic sequence-specific NMR assignment of amino acid side-chains in proteins, which uses as input the primary structure of the protein, chemical shift lists of 1HN, 15N, 13Cα, 13Cβ and possibly 1Hα from the previous polypeptide backbone assignment, and one or several 3D 13C- or 15N-resolved [1H,1H]-NOESY spectra. ASCAN has also been laid out for the use of TOCSY-type data sets as supplementary input. The program assigns new resonances based on comparison of the NMR signals expected from the chemical structure with the experimentally observed NOESY peak patterns. The core parts of the algorithm are a procedure for generating expected peak positions, which is based on variable combinations of assigned and unassigned resonances that arise for the different amino acid types during the assignment procedure, and a corresponding set of acceptance criteria for assignments based on the NMR experiments used. Expected patterns of NOESY cross peaks involving unassigned resonances are generated using the list of previously assigned resonances, and tentative chemical shift values for the unassigned signals taken from the BMRB statistics for globular proteins. Use of this approach with the 101-amino acid residue protein FimD(25–125) resulted in 84% of the hydrogen atoms and their covalently bound heavy atoms being assigned with a correctness rate of 90%. Use of these side-chain assignments as input for automated NOE assignment and structure calculation with the ATNOS/CANDID/DYANA program suite yielded structure bundles of comparable quality, in terms of precision and accuracy of the atomic coordinates, as those of a reference structure determined with interactive assignment procedures. A rationale for the high quality of the ASCAN-based structure determination results from an analysis of the distribution of the assigned side chains, which revealed near-complete assignments in the core of the protein, with most of the incompletely assigned residues located at or near the protein surface.

Keywords

Amino acid side-chain NMR assignment ASCAN Nuclear Overhauser effect NOESY Automation of protein structure determination 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Francesco Fiorito
    • 1
  • Torsten Herrmann
    • 1
    • 2
  • Fred F. Damberger
    • 1
  • Kurt Wüthrich
    • 1
    • 3
  1. 1.Institut für Molekularbiologie und Biophysik, ETH ZürichZurichSwitzerland
  2. 2.Université de Lyon, CNRS/ENS Lyon/UCB Lyon-1, Centre Européen de RMN à Très Hauts Champs de LyonVilleurbanneFrance
  3. 3.Department of Molecular Biology and Skaggs Institute of Chemical BiologyThe Scripps Research InstituteLa JollaUSA

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