Sequence alignment between 1hgx(A) and UniProt seq P51900 (HGXR_TRIFO):

P51900 (HGXR_TRIFO): Hypoxanthine-guanine-xanthine phosphoribosyltransferase from Tritrichomonas foetus
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180   
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---
UniProt: MTETPMMDDLERVLYNQDDIQKRIRELAAELTEFYEDKNPVMICVLTGAVFFYTDLLKHLDFQLEPDYIICSSYSGTKSTGNLTISKDLKTNIEGRHVLVVEDIIDTGLTMYQLLNNLQMRKPASLKVCTLCDKDIGKKAYDVPIDYCGFVVENRYIIGYGFDFHNKYRNLPVIGILKESVYT
         .........................................................................XXXXXXXXX.....................................................................................................
PDB seq: ------MDDLERVLYNQDDIQKRIRELAAELTEFYEDKNPVMICVLTGAVFFYTDLLKHLDFQLEPDYIICSS---------LTISKDLKTNIEGRHVLVVEDIIDTGLTMYQLLNNLQMRKPASLKVCTLCDKDIGKKAYDVPIDYCGFVVENRYIIGYGFDFHNKYRNLPVIGILKE----
               ---+---------+---------+---------+---------+---------+---------+---         -------+---------+---------+---------+---------+---------+---------+---------+---------+---------    
                 10        20        30        40        50        60        70                  90       100       110       120       130       140       150       160       170