Bacterial alginate lyase gene: Nucleotide sequence and molecular route for generation of alginate lyase species |
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Affiliation: | 1. PET & Cyclotron Unit, Department of Nuclear Medicine, Odense University Hospital, Sdr. Boulevard 29, DK-5000, Odense, Denmark;2. Department of Nuclear Medicine & PET Centre, Aarhus University Hospital, DK-8000, Aarhus C, Denmark;3. DanPET AB, Malmö, Sweden |
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Abstract: | A bacterium (strain A1) isolated from a ditch synthesized three types of intracellular alginate lyases: A1-I (molecular weight [M.W.] 60,000), A1-II-2 (M.W. 25,000) and A1-III (M.W. 38,000). The nucleotide sequence of the gene for A1-I lyase, which has been cloned in Escherichia coli DH1 was determined. The open reading frame of the gene encoded 622 amino acids with a calculated M.W. of 69,153. The N-terminal amino acid sequence of A1-I lyase purified from strain A1 or E. coli DH1 cells transformed with the A1-I lyase gene was consistent with the deduced sequence from 55His to 74Ala, indicating that the A1-I lyase was synthesized as a precursor with a M.W. of 69,153 and then processed to a mature form with a M.W. of 63,681. The N-terminal sequence of the first twenty amino acids of A1-III lyase was found to match that of A1-I lyase. The N-terminal sequence of the first twenty amino acids of A1-II-2 lyase was consistent with the deduced amino acid sequence from 414Ala to 433Val in the nucleotide sequence of the A1-I lyase gene. These results indicated that the A1-I lyase was further processed to generate A1-II-2 and A1-III lyase species. |
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