JOY is a program to annotate protein sequence alignments with three-dimensional (3D) structural features. It was developed to display 3D structural information in a sequence alignment and help understand the conservation of amino acids in their specific local environments. For instance, it has been recognised that a sidechain hydrogen-bonded to a main-chain amide plays an important role in stabilizing the 3D structure and is generally well conserved during evolution. Such a residue is shown in a bold-face letter in the formatted alignments. Another example is the importance of solvent inaccessible residues which are shown in UPPER-CASE letters.
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Mizuguchi, K., Deane, C.M., Blundell, T.L., Johnson,M.S. and Overington, J.P. (1998)
JOY: protein sequence-structure representation and analysis.