Sequence alignment between 3ssx(R) and UniProt seq P0A881 (TRPR_ECOLI):

P0A881 (TRPR_ECOLI): Trp operon repressor from Escherichia coli (strain K12)
                 10        20        30        40        50        60        70        80        90       100        
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
UniProt: MAQQSPYSAAMAEQRHQEWLRFVDLLKNAYQNDLHLPLLNLMLTPDEREALGTRVRIVEELLRGEMSQRELKNELGAGIATITRGSNSLKAAPVELRQWLEEVLLKSD
         ..........................................................................X.................................
PDB seq: ----SPYSAAMAEQRHQEWLRFVDLLKNAYQNDLHLPLLNLMLTPDEREALGTRVRIVEELLRGEMSQRELKNEFGAGIATITRGSNSLKAAPVELRQWLEEVLLK--
             -----+---------+---------+---------+---------+---------+---------+---------+---------+---------+------  
                 10        20        30        40        50        60        70        80        90       100