Sequence alignment between 3d6c(A) and UniProt seq P00644 (NUC_STAAU):

P00644 (NUC_STAAU): Thermonuclease from Staphylococcus aureus
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230 
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
UniProt: MLVMTEYLLSAGICMAIVSILLIGMAISNVSKGQYAKRFFFFATSCLVLTLVVVSSLSSSANASQTDNGVNRSGSEDPTVYSATSTKKLHKEPATLIKAIDGDTVKLMYKGQPMTFRLLLVDTPETKHPKKGVEKYGPEASAFTKKMVENAKKIEVEFDKGQRTDKYGRGLAYIYADGKMVNEALVRQGLAKVAYVYKPNNTHEQHLRKSEAQAKKEKLNIWSEDNADSGQ
         .......................................................................................................................X..............................................................................X......X...X.....................
PDB seq: ----------------------------------------------------------------------------------------LHKEPATLIKAIDGDTVKLMYKGQPMTFRLLEVDTPETKHPKKGVEKYGPEASAFTKKMVENAKKIEVEFDKGQRTDKYGRGLAYIYADGKMVNEALVRQGLAKVAYVYKGNNTHEQLLRKAEAQAKKEKLNIWS--------
                                                                                                 ---+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-        
                                                                                                   10        20        30        40        50        60        70        80        90       100       110       120       130       140