Structure Comparison Program

HOMOLOGY

HOMOLOGY is a structure comparison program [1-3]. This program compares two different structures. The coordinates (x,y,z) of selected atoms are converted to Cartesian coordinates by :

• P1 = [T1] x1 : for the 1st molecule
• P2 = [T2] x2 : for the 2nd molecule

The second molecule is then rotated and translated to correspond to the first by performing the transformation :

• P2' = [C] P2 + d

A best fit is obtained between two molecules by least squres for atoms considered to be equivalent. Finally, all the atoms of the first molecules and of the rotated second molecules are written out.

Download HOMOLOGY source and man page (keyworded)

Download HOMOLOGY test files (keyworded)

Download HOMOLOGY source and man page (non-keyworded)

Download HOMOLOGY test files (non-keyworded)

[1] Rossmann,M.G. & Argos,P. 1976. Exploring Structural Homology of Proreins. JMB. 105:75-95.

[2] Rao,S.T. & Argos,P. 1973. Comparison of Super-secondary Structures inProteins. JMB. 76:241-256.

[3] Rossmann,M.G. & Argos,P. 1975. A Comparison of the Heme Binding Pocket in Globins & Cytochrome b5. JBC. 250:7525-7532.

STEREO

STEREO is a program that extracts 3d coordinates from a stereo diagram.

Download STEREO source and man page (keyworded)

Download STEREO test files (keyworded)

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