While other replacements of the lysine residues still allowed interaction with nucleotides as demonstrated by photocross-linking with the analog 8 azido ATP enhancement of fluorescence of trinitrophenyl-ATP.a change to asparagine also
eliminated the nucleotide-binding activity. Wilken, Schmees and Schneider, unpublished). Similarly, substitutions of the conserved aspartate residue in site B were generally shown to abolish ATPase activity and nucleotide binding