Sequence alignment between 1tro(A) 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: ----SPYSAAMAEERHQEWLRFVDLLKNAYQNDLHLPLLNLMLTPDEREALGTRVRIVEELLRGEMSQRELKNELGAGIATITRGSNSLKAAPVELRQWLEEVLLKSD
             -----+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
                 10        20        30        40        50        60        70        80        90       100