Protein
Alginate biosynthesis protein AlgX
Organism
Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)
Function
Plays two roles in the biosynthesis of the exopolysaccharide alginate: protects alginate from degradation as the polymer traverses the periplasm, and also plays a role in its O-acetylation. Acetylation of alginate causes the cells in the biofilm to adhere better to lung epithelium, form microcolonies, and resist the effects of the host immune system and/or antibiotics. Displays a low acetylesterase activity in vitro using a pseudosubstrate, 3-carboxyumbelliferyl acetate. Probably has acetyltransferase activity in vivo.
Similarity
Belongs to the AlgX family.
Sequence
MKTRTSRLFRLSALAAGLCLAQAALAADPGAAPSYQALPAGNLCPAAAYDSRYNTKYLGFFTHLVQAQDDWLFRTTYDLRTDFGTSAEGWRELRALRDELKRKGIELVVVYQPTRGLVNREKLSPAEKAGFDYELAKKNYLATIARFRQAGIWTPDFSPLFDEKEEHAYYFKGDHHWTPHGARRSAKIVAETLKQVPGFEEIPKKQFESKRVGLLSKLGTFHKAAAQLCGNSYATQYVDRFETEPVGASDSGDLFGDGGNPQIALVGTSNSGPAYNFAGFLEEFSGADILNNAVSGGGFDSSLLAYMTSEEFHKNPPKILIWEFATHYDMAQKSFYRQAMPLVDNGCSGRKTVLSRKVKLRQGRNEVLLNSAALPIRSGSYVADVTYSDPSVHELKNTIWYMNGRREQLKIEQSKAVDTGGRYVFQLRNDSDWADQQFLSLEIEAPEDMPQGLEVQASICQAAPAKASQSVAGR