Sequence alignment between 1vq3(A) and UniProt seq Q9X0X1 (PURS_THEMA):

Q9X0X1 (PURS_THEMA): Phosphoribosylformylglycinamidine synthase subunit PurS from Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8)
                     10        20        30        40        50        60        70        80  
         ---------+---------+---------+---------+---------+---------+---------+---------+--
UniProt: ----MPLFKFAIDVQYRSNVRDPRGETIERVLREEKGLPVKKLRLGKSIHLEVEAENKEKAYEIVKKACEELLVNPVVEEYEVREL
         ....X.................................................................................
PDB seq: HHHHLPLFKFAIDVQYRSNVRDPRGETIERVLREEKGLPVKKLRLGKSIHLEVEAENKEKAYEIVKKACEELLVNPVVEEYEVREL
         ---+---------+---------+---------+---------+---------+---------+---------+---------+--
            0        10        20        30        40        50        60        70        80