Abstract
The structural gene for the porin of Haemophilus influenzae type b, designated outer membrane protein P2, was cloned, and the DNA sequence was determined. An oligonucleotide probe generated by reverse translation of N-terminal amino acid sequence data from the purified protein was used to screen genomic DNA. The probe detected a single EcoRI fragment of approximately 1,700 base pairs which was cloned to lambda gt11 and then into M13 and partially sequenced. The derived amino acid sequence indicated that we had cloned the N-terminal portion of the P2 gene. An overlapping approximately 1,600-base-pair PvuII genomic fragment was cloned into M13, and the sequence of the remainder of the P2 gene was determined. The gene for P2 was then reconstructed under the control of the T7 promoter and expressed in Escherichia coli. The N-terminal sequence of the purified protein corresponds to residues 21 through 34 of the derived amino acid sequence. Thus, the protein is synthesized with a 20-amino-acid leader peptide. The Mr of the processed protein is 37,782, in good agreement with the estimate of 37,000 from sodium dodecyl sulfate-polyacrylamide gel electrophoresis.
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Selected References
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