Nucleotide sequences of two cellulase genes from alkalophilic Bacillus sp. strain N-4 and their strong homology.
Two genes for cellulases of alkalophilic Bacillus sp. strain N-4 (ATCC 21833) have been sequenced. From the DNA sequences the cellulases encoded in the plasmids pNK1 and pNK2 consist of 488 and 409 amino acids, respectively. The DNA and protein sequences of the pNK1-encoded cellulase are related to those of the pNK2-encoded cellulase. The pNK2-encoded cellulase lacks the direct repeat sequence of a stretch of 60 amino acids near the C-terminal end of the pNK1-encoded cellulase. The duplication of the cellulase genes and the formation of the direct repeat in the pNK1-encoded cellulase occurred at almost the same time.
13 references, click to expand
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