Cross-structure statistics for 3D structure alignment of FEF family members of A.oryzae feruloylome.
RMSD stands for the Root Mean Square Deviation, calculated between Cα-atoms of matched residues at best 3D superposition of the query and target structures. RMSD is presented in angstroms. In simple words, RMSD gives you an idea how separated, at best 3D superposition, a “typical” pair of matched Ca-atoms is.2
Sequence identity is a quality characteristic of Cα-alignment. It is calculated from structure (3D), rather than sequence alignment. Therefore, two almost identical sequences may be estimated at low sequence identity if they fold into slightly different structures.