Sequence alignment between 1k4j(A) and UniProt seq P54656 (ESAI_PANSE):

P54656 (ESAI_PANSE): Acyl-homoserine-lactone synthase from Pantoea stewartii subsp. stewartii
                  10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210
         ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
UniProt: -MLELFDVSYEELQTTRSEELYKLRKKTFSDRLGWEVICSQGMESDEFDGPGTRYILGICEGQLVCSVRFTSLDRPNMITHTFQHCFSDVTLPAYGTESSRFFVDKARARALLGEHYPISQVLFLAMVNWAQNNAYGNIYTIVSRAMLKILTRSGWQIKVIKEAFLTEKERIYLLTLPAGQDDKQQLGGDVVSRTGCPPVAVTTWPLTLPV
         .............XXXXXXXXXXXXXXXXXX....................................................................................................................................................................................
PDB seq: HMLELFDVSYEEL------------------RLGWEVICSQGMESDEFDGPGTRYILGICEGQLVCSVRFTSLDRPNMITHTFQHCFSDVTLPAYGTESSRFFVDKARARALLGEHYPISQVLFLAMVNWAQNNAYGNIYTIVSRAMLKILTRSGWQIKVIKEAFLTEKERIYLLTLPAGQDDKQQLGGDVVSRTGCPPVAVTTWPLTLPV
         ----------+--                  ---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+---------+
                  10                            40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200       210