38 Goddard TD, Kneller DG SPARKY 3. University of California, San Francisco. http://www.cgl.ucsf.edu/home/sparky/ Locht C, Keith JM (1986) Pertussis toxin gene: nucleotide sequence and genetic organization. Science 232:1258–1264 Masignani V, Balducci E, Di Marcello F, Savino S, Serruto D, Veggi D, Bambini S, Scarselli M, Arico B, Comanducci M, Adu-Bobie J, Giuliani M, Rappuoli R, Pizza M (2003) NarE: a novel ADP- ribosyltransferase from Neisseria meningitidis. Mol Microbiol 50(3):1055–1067 Moss J, Vaughan M (1988) ADP-ribosylation of guanyl nucleotide- binding regulatory proteins by bacterial toxins. Adv Enzymol 61:303–379 L. Carlier et al. Shen Y, Delaglio F, Cornilescu G, Bax A (2009) TALOS?: a hybrid method for predicting protein backbone torsion angles from NMR chemical shifts. J Biomol NMR 44:213–223 Wishart DS, Sykes BD (1994) The 13C chemical shift index. A simple method for the identiﬁcation of protein secondary structure using 13C chemical shift data. J Biomol NMR 4:171–180 Wishart DS, Bigam CG, Yao J, Abildgaard F, Dyson HJ, Oldﬁeld E, Markley JL, Sykes BD (1995) 1H, 13C and 15N chemical shift referencing in biomolecular NMR. J Biomol NMR 6:135–140 123