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. 1987 Dec;55(12):3023–3029. doi: 10.1128/iai.55.12.3023-3029.1987

Cloning and sequence analysis of cytadhesin P1 gene from Mycoplasma pneumoniae.

C J Su 1, V V Tryon 1, J B Baseman 1
PMCID: PMC260023  PMID: 3119495

Abstract

Mycoplasma pneumoniae cytadhesin P1 was purified by monoclonal antibody affinity chromatography followed by preparative sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The N-terminal 18-amino-acid sequence of P1 was determined and used to design two synthetic oligonucleotides, a 14-mer corresponding to amino acids 1 to 5 and an 18-mer corresponding to amino acids 7 to 12. These oligonucleotides served as hybridization probes for the identification of the P1 gene by Southern blot analysis of M. pneumoniae DNA. The P1 gene was cloned into plasmid pUC19 and mapped by using appropriate restriction endonucleases. The DNA sequence of the entire P1 gene was determined by subcloning appropriate DNA fragments into bacteriophage M13 and sequencing the DNA by the dideoxy-chain-termination method. The P1 gene contains an open reading frame of 4,881 nucleotides coding for a protein of 1,627 amino acids with a calculated molecular weight of 176,288. Properties of the amino-terminal sequence suggest that protein P1 may be synthesized as a precursor with subsequent processing to a mature protein of a calculated molecular weight of 169,758. Potential antigenic sites were determined by hydrophilicity plots. A computer search revealed that part of the predicted P1 sequence is homologous to cytoskeletal keratin of mammalian species and human fibrinogen alpha chain precursor. These results demonstrate the uniqueness of P1 as a cytadhesin and virulence determinant.

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Selected References

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