Abstract
We present a new program, PASA (Program for Automated Sequential Assignment), for assigning protein backbone resonances based on multidimensional heteronuclear NMR data. Distinct from existing programs, PASA emphasizes a per-residue-based pattern-filtering approach during the initial stage of the automated 13Cα and/or 13Cβ chemical shift matching. The pattern filter employs one or multiple constraints such as 13Cα/Cβ chemical shift ranges for different amino acid types and side-chain spin systems, which helps to rule out, in a stepwise fashion, improbable assignments as resulted from resonance degeneracy or missing signals. Such stepwise filtering approach substantially minimizes early false linkage problems that often propagate, amplify, and ultimately cause complication or combinatorial explosion of the automation process. Our program (http://www.lerner.ccf.org/moleccard/qin/) was tested on four representative small-large sized proteins with various degrees of resonance degeneracy and missing signals, and we show that PASA achieved the assignments efficiently and rapidly that are fully consistent with those obtained by laborious manual protocols. The results demonstrate that PASA may be a valuable tool for NMR-based structural analyses, genomics, and proteomics.
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Xu, Y., Wang, X., Yang, J. et al. PASA – A Program for Automated Protein NMR Backbone Signal Assignment by Pattern-Filtering Approach. J Biomol NMR 34, 41–56 (2006). https://doi.org/10.1007/s10858-005-5358-0
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DOI: https://doi.org/10.1007/s10858-005-5358-0