Sequence alignment between 4xel(A) and UniProt seq Q9HWZ6 (IPYR_PSEAE):

Q9HWZ6 (IPYR_PSEAE): Inorganic pyrophosphatase from Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1) 
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170     
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+-----
UniProt: MSYSKIPAGKDLPNDIYVAIEIPANHAPIKYEIDKDTDCLFVDRFMATPMFYPANYGFIPNTLADDGDPLDVLVVTPYPVAPGSVIRARPVGVLHMTDEAGGDAKLIAVPHDKLSVLYKDVKEYTDLPALLLEQIKHFFENYKDLEKGKWVKVEGWGNADAARAEITKAVAAFQK
         ....................................................................................................................................................XX.........................
PDB seq: -SYSKIPAGKDLPNDIYVAIEIPANHAPIKYEIDKDTDCLFVDRFMATPMFYPANYGFIPNTLADDGDPLDVLVVTPYPVAPGSVIRARPVGVLHMTDEAGGDAKLIAVPHDKLSVLYKDVKEYTDLPALLLEQIKHFFENYKDLEKG--VKVEGWGNADAARAEITKAVAAFQK
          --------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------  ---------+---------+-----
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140                 160       170