Bacterial Alginate Lyase Gene : Nucleotide Sequence and Molecular Route for Generation of Alginate Lyase Species

概要

論文の詳細を見る
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 A1-I lyase gene was consistent with the deduced sequence from ^<55>His to ^<74>Ala, 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 ^<414>Ala to ^<433>Val 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.
社団法人日本生物工学会の論文
1993-05-25