... University of California, Berkeley, USA). (C) Diagram showing the structure of human TMP kinase(1E2D.pdb), with the main motifs: the LID is in red, the P loop in blue and the adenine loop in black, with ... enzyme, the replacement of the conserved alanine into a tyro-sine in the binding site of thymidine, shifted the enzyme specificity towards guanosine [33]. Moreoverthree mutations in the deoxynucleoside ... the human and vaccinia enzymes.ABCFig. 1. Sequence and model for the structure of vaccinia virus TMP kinase and the human enzyme. (A) Alignment of the amino acidsequence of VVTMP kinase with...