Aggregatibacter actinomycetemcomitans Growth in Biofilm versus Planktonic State: Differential Expression of Proteins

• Published in: Journal of proteome research Vol. 16; no. 9; pp. 3158 - 3167
• Main Authors: Llama-Palacios, Arancha, Potupa, Oksana, Sánchez, María C, Figuero, Elena, Herrera, David, Sanz, Mariano
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 01.09.2017
• Subjects: Adenylate Kinase - genetics; Adenylate Kinase - metabolism; Aggregatibacter actinomycetemcomitans - genetics; Aggregatibacter actinomycetemcomitans - growth & development; Aggregatibacter actinomycetemcomitans - isolation & purification; Aggregatibacter actinomycetemcomitans - metabolism; Bacterial Outer Membrane Proteins - genetics; Bacterial Outer Membrane Proteins - metabolism; Biofilms - growth & development; Dihydrolipoyllysine-Residue Acetyltransferase - genetics; Dihydrolipoyllysine-Residue Acetyltransferase - metabolism; Gene Expression Profiling; Gene Expression Regulation, Bacterial; Gene Ontology; Humans; Metabolic Networks and Pathways - genetics; Molecular Chaperones - genetics; Molecular Chaperones - metabolism; Molecular Sequence Annotation; Periodontitis - microbiology; Plankton - genetics; Plankton - growth & development; Plankton - metabolism; Two-Dimensional Difference Gel Electrophoresis; Virulence Factors - genetics; Virulence Factors - metabolism; Aggregatibacter actinomycetemcomitans; proteomic; outer membrane proteins; 2D-DIGE; biofilm
• ISSN: 1535-3893; 1535-3907
• DOI: 10.1021/acs.jproteome.7b00127

Aggregatibacter actinomycetemcomitans (Aa) is a pathogenic bacterium residing in the subgingival plaque biofilm strongly associated with the pathogenesis of periodontitis. The aim of this investigation was to study the protein differential expression of Aa when growing on biofilm compared with planktonic state using proteomic analysis by the 2D-DIGE system. Eighty-seven proteins were differentially expressed during biofilm growth (1.5-fold, p < 0.05), with 13 overexpressed and 37 down-expressed. Those repressed were mainly proteins involved in metabolism, biosynthesis, and transport. The overexpressed proteins were outer membrane proteins (OMPs) and highly immunogenic proteins such as YaeT (OMP), FtsZ, OMP39, OMP18/16, the chaperone GroEL, OMPA, adenylate kinase (Adk), and dihydrolipoamide acetyltransferase. The enrichment fractions of the OMPs from biofilm and planktonic states were obtained, and these proteins were analyzed by Western blotting with human serum from a periodontitis patient and one healthy control. These immunogenic proteins overexpressed in the biofilm may represent candidate virulence factors.