When I work with online servers for my protein, i get an RMSD value of -1 and TM score of -1. What does these values suggest of my protein? can any one of you explain?
After the structural calculations a family of structures is obtained instead of an exactly defined structure. This family spans out a relatively narrow conformational space. Therefore, the quality of a NMR structure can be defined by the mean deviation of each structure from this family (RMSD) from an energy minimized mean structure which has to be calculated previously. The smaller the deviation from this mean structure the narrower the conformational space. Another definition of RMSD is to compare pairwise the structures of a family and calculate the mean of these deviations.
Find more at : http://en.wikipedia.org/wiki/Root_mean_square_deviation_%28bioinformatics%29