Sequence alignment between 1a4x(A) and UniProt seq P39765 (PYRR_BACSU):

P39765 (PYRR_BACSU): Bifunctional protein PyrR from Bacillus subtilis (strain 168)
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180 
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-
UniProt: MNQKAVILDEQAIRRALTRIAHEMIERNKGMNNCILVGIKTRGIYLAKRLAERIEQIEGNPVTVGEIDITLYRDDLSKKTSNDEPLVKGADIPVDITDQKVILVDDVLYTGRTVRAGMDALVDVGRPSSIQLAVLVDRGHRELPIRADYIGKNIPTSKSEKVMVQLDEVDQNDLVAIYENE
         .........................................................................XXXXXXXXXX..................................................................................................
PDB seq: ---KAVILDEQAIRRALTRIAHEMIERNKGMNNCILVGIKTRGIYLAKRLAERIEQIEGNPVTVGEIDITLYR----------EPLVKGADIPVDITDQKVILVDDVLYTGRTVRAGMDALVDVGRPSSIQLAVLVDRGHRELPIRADYIGKNIPTSKSEKVMVQLDEVDQNDLVAIYEN-
            ------+---------+---------+---------+---------+---------+---------+---          ------+---------+---------+---------+---------+---------+---------+---------+---------+---------+ 
                 10        20        30        40        50        60        70                  90       100       110       120       130       140       150       160       170       180