Sequence alignment between 6f4l(A) and UniProt seq Q9X1X7 (NADA_THEMA):

Q9X1X7 (NADA_THEMA): Quinolinate synthase from Thermotoga maritima (strain ATCC 43589 / DSM 3109 / JCM 10099 / NBRC 100826 / MSB8)
                     10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290        
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
UniProt: ----MVDEILKLKKEKGYIILAHNYQIPELQDIADFVGDSLQLARKAMELSEKKILFLGVDFMAELVKILNPDKKVIVPDRSATCPMANRLTPEIIREYREKFPDAPVVLYVNSTSECKTLADVICTSANAVEVVKKLDSSVVIFGPDRNLGEYVAEKTGKKVITIPENGHCPVHQFNAESIDAVRKKYPDAKVIVHPECPKPVRDKADYVGSTGQMEKIPEKDPSRIFVIGTEIGMIHKLKKKFPDREFVPLEMAVCVNMKKNTLENTLHALQTESFEVILPKEVIEKAKKPILRMFELMG
         ..............................................................................................................................................................................................................................X...............................................................................
PDB seq: HHHHMVDEILKLKKEKGYIILAHNYQIPELQDIADFVGDSLQLARKAMELSEKKILFLGVDFMAELVKILNPDKKVIVPDRSATCPMANRLTPEIIREYREKFPDAPVVLYVNSTSECKTLADVICTSANAVEVVKKLDSSVVIFGPDRNLGEYVAEKTGKKVITIPENGHCPVHQFNAESIDAVRKKYPDAKVIVHPECPKPVRDKADYVGSTGQMEKIPERDPSRIFVIGTEIGMIHKLKKKFPDREFVPLEMAVCVNMKKNTLENTLHALQTESFEVILPKEVIEKAKKPILRMFELMG
         ---+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+--------
            0        10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210       220       230       240       250       260       270       280       290