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Analysis of tandem, multiple genes encoding 30-kDa membrane proteins in Pasteurella haemolytica A1
1Oklahoma State University, Department of Veterinary Pathology, Stillwater 74078.
Abstract:
A number of outer membrane proteins (OMPs), including a 30-kDa protein, may be important in eliciting immunity to Pasteurella haemolytica A1, the causative agent of bovine pneumonic pasteurellosis. To better understand the nature of the 30-kDa antigen, several genes encoding this protein were sequenced. Sequence analysis revealed that three separate genes encoding similar, yet distinct, versions of the 30-kDa protein are tandemly arranged on the P. haemolytica A1 chromosome. The genes appear to be transcribed from a single promoter. The deduced amino acid sequences of the proteins encoded by these genes are similar to a 28-kDa inner membrane lipoprotein of Escherichia coli and a 28-kDa membrane protein which may contribute to the virulence of Haemophilus influenzae type b strains.
Insights
Outer membrane proteins (OMPs) are key to immunity against bovine pneumonic pasteurellosis. Researchers sequenced genes for a 30-kDa OMP in Pasteurella haemolytica A1, finding three distinct versions arranged together.
Area of Science:
- Veterinary Microbiology
- Bacterial Genetics
- Immunology
Background:
- Outer membrane proteins (OMPs) of Pasteurella haemolytica A1 are implicated in bovine pneumonic pasteurellosis immunity.
- A specific 30-kDa OMP is a potential target for eliciting protective immunity.
Purpose of the Study:
- To investigate the genetic basis and characteristics of the 30-kDa antigen in Pasteurella haemolytica A1.
- To understand the genomic organization and potential evolutionary relationships of genes encoding the 30-kDa protein.
Main Methods:
- Gene sequencing of multiple genes encoding the 30-kDa protein from Pasteurella haemolytica A1.
- Bioinformatic analysis of deduced amino acid sequences.
- Analysis of gene arrangement and transcriptional organization.
Main Results:
- Three distinct, yet similar, genes encoding versions of the 30-kDa protein were identified.
- These genes are tandemly arranged on the Pasteurella haemolytica A1 chromosome.
- The genes appear to be transcribed from a single promoter.
- Deduced amino acid sequences show similarity to proteins from Escherichia coli and Haemophilus influenzae.
Conclusions:
- The 30-kDa antigen is encoded by a gene family within Pasteurella haemolytica A1.
- The identified gene family suggests potential functional redundancy or adaptation.
- Sequence similarities hint at conserved functions or evolutionary links with other Gram-negative bacteria.