Sequence alignment between 4a2s(A) and UniProt seq Q06121 (TRPC_SULSO):

Q06121 (TRPC_SULSO): Indole-3-glycerol phosphate synthase from Saccharolobus solfataricus (strain ATCC 35092 / DSM 1617 / JCM 11322 / P2)
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         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
UniProt: MPRYLKGWLKDVVQLSLRRPSFRASRQRPIISLNERILEFNKRNITAIIAEYKRKSPSGLDVERDPIEYSKFMERYAVGLSILTEEKYFNGSYETLRKIASSVSIPILMKDFIVKESQIDDAYNLGADTVLLIVKILTERELESLLEYARSYGMEPLIEINDENDLDIALRIGARFIGINSRDLETLEINKENQRKLISMIPSNVVKVAESGISERNEIEELRKLGVNAFLIGSSLMRNPEKIKEFIL
         .........X...........X............................X.X................X............X..........................X................................................X....................X.XXX..X......................XX.....................X............X.X
PDB seq: -PRYLKGWLEDVVQLSLRRPSVRASRQRPIISLNERILEFNKRNITAIIAYYSRKSPSGLDVERDPIEYAKFMERYAVGLSIKTEEKYFNGSYETLRKIASSVSIPILMSDFIVKESQIDDAYNLGADTVLLIVKILTERELESLLEYARSYGMEPLILINDENDLDIALRIGARFIGIFSMNFETGEINKENQRKLISMIPSNVVKVAKLGISERNEIEELRKLGVNAFLISSSLMRNPEKIKELIE
          --------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
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