(Below N is a link to NCBI taxonomic web page and E link to ESTHER at designed phylum.) > cellular organisms: NE > Bacteria: NE > Proteobacteria: NE > Gammaproteobacteria: NE > Pseudomonadales: NE > Pseudomonadaceae: NE > Pseudomonas: NE > Pseudomonas chlororaphis group: NE > Pseudomonas chlororaphis: NE
Warning: This entry is a compilation of different species or line or strain with more than 90% amino acide identity. You can retrieve all strain data
(Below N is a link to NCBI taxonomic web page and E link to ESTHER at designed phylum.) Pseudomonas aurantiaca: N, E.
Pseudomonas chlororaphis O6: N, E.
Pseudomonas chlororaphis subsp. aureofaciens 30-84: N, E.
Pseudomonas chlororaphis subsp. chlororaphis: N, E.
Pseudomonas chlororaphis subsp. aurantiaca: N, E.
Pseudomonas chlororaphis subsp. aureofaciens: N, E.
Pseudomonas chlororaphis subsp. aurantiaca PB-St2: N, E.
LegendThis sequence has been compared to family alignement (MSA) red => minority aminoacid blue => majority aminoacid color intensity => conservation rate title => sequence position(MSA position)aminoacid rate Catalytic site Catalytic site in the MSA MSTLSWVRGVNGTLGWVAPTLVASKMRLAFMTPRERLPRDWELPLLARSE RITLRFGLSALRWGQGPAVLLMHGWEGRPTQFASLIDALVGAGYSVVALD GPAHGRSPGHEANVMLFARAMLEAAAELPPLRAVIGHSMGGASAMLAVQL GLRTETLVSIAAPARILGVLRGFARYVRLPPKARSAFIRQVEQDVGMRAA AMDVAHYQLDMPGLIVHAEDDNFVPVKESDLIHEAWFDSRLLRLKEGGHQ RVLADPRVIEGVLTLLAGRSLQARQSA
Reference
Title: Characterization of Polymer Degrading Lipases, LIP1 and LIP2 From Pseudomonas chlororaphis PA23 Mohanan N, Wong CH, Budisa N, Levin DB Ref: Front Bioeng Biotechnol, 10:854298, 2022 : PubMed
The outstanding metabolic and bioprotective properties of the bacterial genus Pseudomonas make these species a potentially interesting source for the search of hydrolytic activities that could be useful for the degradation of plastics. We identified two genes encoding the intracellular lipases LIP1 and LIP2 of the biocontrol bacterium Pseudomonas chlororaphis PA23 and subsequently performed cloning and expression in Escherichia coli. The lip1 gene has an open reading frame of 828 bp and encodes a protein of 29.7 kDa whereas the lip2 consists of 834 bp and has a protein of 30.2 kDa. Although secondary structure analyses of LIP1 and LIP2 indicate a dominant alpha/beta-hydrolase-fold, the two proteins differ widely in their amino acid sequences (15.39% identity), substrate specificities, and hydrolysis rates. Homology modeling indicates the catalytic serine in both enzymes located in a GXSXG sequence motif (lipase box). However, LIP1 has a catalytic triad of Ser152-His253-Glu221 with a GGX-type oxyanion pocket, whereas LIP2 has Ser138-His249-Asp221 in its active site and a GX-type of oxyanion hole residues. However, LIP1 has a catalytic triad of Ser152-His253-Glu221 with an oxyanion pocket of GGX-type, whereas LIP2 has Ser138-His249-Asp221 in its active site and a GX-type of oxyanion hole residues. Our three-dimensional models of LIP1 and LIP2 complexed with a 3-hydroxyoctanoate dimer revealed the core alpha/beta hydrolase-type domain with an exposed substrate binding pocket in LIP1 and an active-site capped with a closing lid domain in LIP2. The recombinant LIP1 was optimally active at 45 degreesC and pH 9.0, and the activity improved in the presence of Ca(2+). LIP2 exhibited maximum activity at 40 degreesC and pH 8.0, and was unaffected by Ca(2+). Despite different properties, the enzymes exhibited broadsubstrate specificity and were able to hydrolyze short chain length and medium chain length polyhydroxyalkanoates (PHAs), polylactic acid (PLA), and para-nitrophenyl (pNP) alkanoates. Gel Permeation Chromatography (GPC) analysis showed a decrease in the molecular weight of the polymers after incubation with LIP1 and LIP2. The enzymes also manifested some polymer-degrading activity on petroleum-based polymers such as poly(sigma-caprolactone) (PCL) and polyethylene succinate (PES), suggesting that these enzymes could be useful for biodegradation of synthetic polyester plastics. The study will be the first report of the complete characterization of intracellular lipases from bacterial and/or Pseudomonas species. The lipases, LIP1 and LIP2 are different from other bacterial lipases/esterases in having broad substrate specificity for polyesters.
