... Srini-vas for help with preparing the clone of nPS, A. Aro-ra, CDRI, Lucknow, for help in collecting therelaxation data, and N. Srinivasan and S. Yamunadevi for their help with modeling and analyzing ... A-chain and B-chain of nPS inthe region of the HXGH (34–37) motif (whereX = Asp for E. coli PS and Glu for M. tuberculosis and A. thaliana PS). As compared with the substrate-free form, the ... electrondensity maps and facilitate further rebuilding and improvement of the molecular model, until no unex-plained electron density remained, and the Rcryst and Rfreevalues converged at 18.9% and 24.4%,...