Gene AlgD Coding for GDPmannose Dehydrogenase is Transcriptionally Activated in Mucoid Pseudomonas Aeruginosa
Overview
Authors
Affiliations
Transcriptional regulation of alginate biosynthesis by Pseudomonas aeruginosa was studied. A DNA region complementing the alg-5 mutation within the alginate gene cluster was found by RNA-DNA dot blot and Northern hybridization to be transcriptionally activated in mucoid P. aeruginosa. This region was subcloned as a 3.2-kilobase BglII-ClaI DNA fragment on the broad-host-range controlled transcription vector pMMB24, and gene products were analyzed by expression from the tac promoter. A 48-kilodalton polypeptide was detected in extracts of P. aeruginosa and 35S-labeled Escherichia coli maxicells. By using the same expression system, GDPmannose dehydrogenase activity was detected in both P. aeruginosa and E. coli. Thus, gene algD coding for this enzyme was found to be present in the transcriptionally active DNA area. Insertion of the xylE gene within the BglII-ClaI fragment disrupted the induction of the 48-kilodalton polypeptide, GDPmannose dehydrogenase activity, and alg-5 complementing ability. With the algD-xylE transcription fusion, activation of algD gene expression was shown to occur in mucoid P. aeruginosa of different origins. In addition, regulation of the algD promoter activity was demonstrated to be mediated by a diffusible factor.
Hulen C Antibiotics (Basel). 2023; 12(12).
PMID: 38136683 PMC: 10740432. DOI: 10.3390/antibiotics12121649.
Dolan J, Ahmadipour S, Wahart A, Ni Cheallaigh A, Sari S, Eurtivong C RSC Chem Biol. 2023; 4(11):865-870.
PMID: 37920392 PMC: 10619135. DOI: 10.1039/d3cb00126a.
Pseudomonas aeruginosa biofilm exopolysaccharides: assembly, function, and degradation.
Gheorghita A, Wozniak D, Parsek M, Howell P FEMS Microbiol Rev. 2023; 47(6).
PMID: 37884397 PMC: 10644985. DOI: 10.1093/femsre/fuad060.
Alginate: Enhancement Strategies for Advanced Applications.
Hurtado A, Aljabali A, Mishra V, Tambuwala M, Serrano-Aroca A Int J Mol Sci. 2022; 23(9).
PMID: 35562876 PMC: 9102972. DOI: 10.3390/ijms23094486.
The anti-sigma factor MucA is required for viability in Pseudomonas aeruginosa.
Schofield M, Rodriguez D, Kidman A, Cassin E, Michaels L, Campbell E Mol Microbiol. 2021; 116(2):550-563.
PMID: 33905139 PMC: 10069406. DOI: 10.1111/mmi.14732.