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Nucleotide and deduced amino acid sequences of a subtilisin-like serine protease from a deep-sea bacterium, Alkalimonas collagenimarina AC40T

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Abstract

The acpI gene encoding an alkaline protease (AcpI) from a deep-sea bacterium, Alkalimonas collagenimarina AC40T, was shotgun-cloned and sequenced. It had a 1,617-bp open reading frame encoding a protein of 538 amino acids. Based on analysis of the deduced amino acid sequence, AcpI is a subtilisin-like serine protease belonging to subtilase family A. It consists of a prepropeptide, a catalytic domain, and a prepeptidase C-terminal domain like other serine proteases from the genera Pseudomonas, Shewanella, Alteromonas, and Xanthomonas. Heterologous expression of the acpI gene in Escherichia coli cells yielded a 28-kDa recombinant AcpI (rAcpI), suggesting that both the prepropeptide and prepeptidase C-terminal domains were cleaved off to give the mature form. Analysis of N-terminal and C-terminal amino acid sequences of purified rAcpI showed that the mature enzyme would be composed of 273 amino acids. The optimal pH and temperature for the caseinolytic activity of the purified rAcpI were 9.0–9.5 and 45°C in 100 mM glycine–NaOH buffer. Calcium ions slightly enhanced the enzyme activity and stability. The enzyme favorably hydrolyzed gelatin, collagen, and casein. AcpI from A. collagenimarina AC40T was also purified from culture broth, and its molecular mass was around 28 kDa, indicating that the cleavage manner of the enzyme is similar to that in E. coli cells.

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Correspondence to Atsushi Kurata.

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Kurata, A., Uchimura, K., Shimamura, S. et al. Nucleotide and deduced amino acid sequences of a subtilisin-like serine protease from a deep-sea bacterium, Alkalimonas collagenimarina AC40T . Appl Microbiol Biotechnol 77, 311–319 (2007). https://doi.org/10.1007/s00253-007-1164-9

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Keywords

  • Serine protease
  • Subtilisin
  • Subtilase family A
  • Deep sea
  • Alkalimonas collagenimarina