Identification and characterization of Pseudomonas aeruginosa PA-IIL lectin gene and protein compared to PA-IL

• Published in: FEMS immunology and medical microbiology 2000-09, Vol.29 (1), p.53-57
• Main Authors: Gilboa-Garber, Nechama, Katcoff, Don J., Garber, Nachman C.
• Format: Article
• Language: English
• Subjects: Adhesins, Bacterial - chemistry; Adhesins, Bacterial - genetics; Amino Acid Sequence; Amino acids; Bacteria; Bacteriology; Base Sequence; Binding sites; Biological and medical sciences; Cell membranes; Embedding; Fucose; Fundamental and applied biological sciences. Psychology; Gene expression; Gene regulation; Gene sequencing; Genetics; Glycosylation; Histidine; Hydrophobicity; Lectin gene; Lectin structure; Lectins; Mannose; Mass spectrometry; Mass spectroscopy; Methionine; Microbiology; Molecular Sequence Data; Proteins; Pseudomonas aeruginosa; Pseudomonas aeruginosa - genetics; Pseudomonas aeruginosa - metabolism; Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization - methods; Stop codon; Transcription termination; Virulence factor; Waterborne diseases
• ISSN: 0928-8244; 1574-695X; 2049-632X
• DOI: 10.1111/j.1574-695X.2000.tb01505.x

Abstract Using the 33 N-terminal amino acids of the fucose/mannose binding lectin PA-IIL of Pseudomonas aeruginosa ATCC 33347 in a tblastn search of P. aeruginosa PAO1 genomic sequence in GenBank revealed a single open reading frame encoding a 114-amino acid protein (excluding initiator methionine) perfectly matching that amino acid sequence. Following its stop codon there is a GC-rich sequence having a perfect dyad symmetry promoting formation of a hairpin loop structure, potentially enabling rho-independent transcription termination. Upstream of the putative ribosomal binding site there are sequences resembling Vibrio fischeri luxI box, consistent with autoinduction of this gene. The predicted PA-IIL molecular mass, confirmed by mass spectrometry, is 11 732 Da. Its pI is 3.88. The C-terminal domain is particularly hydrophobic, implying possible embedding in the cell membrane. PA-IIL is similar to P. aeruginosa PA-IL lectin in some amino acids and potential glycosylation sites but lacks cysteine, methionine and histidine. Despite their relations in functions and regulation, their genes are widely separated (by about 867.5 kb).