... a wavelength of 1.38 A ˚, using a MAR 345 imaging plate on the protein crystallography beamline [28,29] at the BrazilianNational Synchrotron Laboratory (Campinas, Brazil). The crystal initially ... nucleotidediphosphate kinase, RNA binding protein, ribosomalprotein, allosteric domain of the regulatory subunit of aspartate transcarbamylase, a viral transcriptional regulator and procarboxypeptidase B ... activity necessaryfor adapting to changes in the quality and abundance of nitrogen sources. The NifA protein is the transcriptionalactivator of nitrogen fixation (nif) genes in the majority of diazotrophs...