Sequence alignment between 1r3k(C) and UniProt seq P0A334 (KCSA_STRLI):

P0A334 (KCSA_STRLI): pH-gated potassium channel KcsA from Streptomyces lividans
                 10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
UniProt: MPPMLSGLLARLVKLLLGRHGSALHWRAAGAATVLLVIVLLAGSYLAVLAERGAPGAQLITYPRALWWSVETATTVGYGDLYPVTLWGRLVAVVVMVAGITSFGLVTAALATWFVGREQERRGHFVRHSEKAAEEAYTRTTRALHERFDRLERMLDDNRR
         .........................................................................................X......................................................................
PDB seq: ---------------------SALHWRAAGAATVLLVIVLLAGSYLAVLAERGAPGAQLITYPRALWWSVETATTVGYGDLYPVTLWGRCVAVVVMVAGITSFGLVTAALATWFVGREQERRGH------------------------------------
                              --------+---------+---------+---------+---------+---------+---------+---------+---------+---------+----                                    
                                     30        40        50        60        70        80        90       100       110       120