[PyMOL] asymmetric transformation matrices

[Thomas E. <te...@mb...>]

Dear pymol users,

I noticed something strange when superimposing 2 opposite pairs of  
chains. E.g.

DEBUG: template  1BQG_A  query  2MUC_A
Query Transformation:
         X2 = +0.86747*(X1+2.29751) + -0.49574*(Y1+60.99794) +   
-0.04181*(Z1+64.71239)
         Y2 = -0.49701*(X1+2.29751) + -0.85983*(Y1+60.99794) +   
-0.11697*(Z1+64.71239)
         Z2 = +0.02204*(X1+2.29751) + +0.12225*(Y1+60.99794) +  
-0.99226*(Z1+64.71239)


DEBUG: template  2MUC_A  query  1BQG_A
Query Transformation:
         X2 = +0.86747*(X1+30.95128) + -0.49701*(Y1+61.15895) +   
+0.02204*(Z1+56.70381)
         Y2 = -0.49574*(X1+30.95128) + -0.85983*(Y1+61.15895) +   
+0.12225*(Z1+56.70381)
         Z2 = -0.04181*(X1+30.95128) + -0.11697*(Y1+61.15895) +  
-0.99226*(Z1+56.70381)

Although looking at the rotation matrices one is the transpose of the  
other, the translation vectors are not opposite. Can someone explain  
that?