Nucleotide sequence of the protein D2 gene of Pseudomonas aeruginosa

Area of Science:

• Microbiology
• Structural Biology
• Genetics

Background:

• Pseudomonas aeruginosa is an opportunistic pathogen known for its intrinsic resistance to antibiotics.
• Outer membrane proteins (OMPs) play a critical role in the permeability barrier of Gram-negative bacteria.
• Understanding the function of specific OMPs is essential for developing strategies to overcome antibiotic resistance.

Purpose of the Study:

• To characterize Protein D2 from Pseudomonas aeruginosa.
• To determine the role of Protein D2 in imipenem permeability.
• To elucidate the genetic and structural features of Protein D2.

Main Methods:

• Cloning and sequencing of the protein D2 gene.
• Bioinformatic analysis of the deduced amino acid sequence.
• Functional characterization of Protein D2 in relation to imipenem transport.

Main Results:

• Protein D2 was identified as the imipenem-permeable pore in the Pseudomonas aeruginosa outer membrane.
• The protein D2 gene encodes a 443-amino acid polypeptide, including a signal peptide and a mature protein of 420 amino acids (M(r) 46,010).
• Protein D2 exhibits a high molar ratio of glycine and lacks cysteine residues, with polar amino acids distributed throughout its sequence.

Conclusions:

• Protein D2 functions as a key porin facilitating imipenem diffusion across the outer membrane of Pseudomonas aeruginosa.
• The structural characteristics of Protein D2, such as its amino acid composition, may influence its pore-forming properties.
• Further investigation into Protein D2 could provide insights into antibiotic resistance mechanisms and potential therapeutic targets.