Journal of Microbiology and Biotechnology

  • 제31권10호
  • /
  • Pages.1393-1400
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  • 2021
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  • 1017-7825(pISSN)
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  • 1738-8872(eISSN)
한국미생물·생명공학회 (The Korean Society for Microbiology and Biotechnology)
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Crystal Structure and Molecular Mechanism of Phosphotransbutyrylase from Clostridium acetobutylicum

  • Kim, Sangwoo (School of Life Sciences, BK21 FOUR KNU Creative BioSesearch Group, Kyungpook National University) ;
  • Kim, Kyung-Jin (School of Life Sciences, BK21 FOUR KNU Creative BioSesearch Group, Kyungpook National University)
  • 투고 : 2021.09.16
  • 심사 : 2021.09.23
  • 발행 : 2021.10.28
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초록

Acetone-butanol-ethanol (ABE) fermentation by the anaerobic bacterium Clostridium acetobutylicum has been considered a promising process of industrial biofuel production. Phosphotransbutyrylase (phosphate butyryltransferase, PTB) plays a crucial role in butyrate metabolism by catalyzing the reversible conversion of butyryl-CoA into butyryl phosphate. Here, we report the crystal structure of PTB from the Clostridial host for ABE fermentation, C. acetobutylicum, (CaPTB) at a 2.9 Å resolution. The overall structure of the CaPTB monomer is quite similar to those of other acyltransferases, with some regional structural differences. The monomeric structure of CaPTB consists of two distinct domains, the N- and C-terminal domains. The active site cleft was formed at the interface between the two domains. Interestingly, the crystal structure of CaPTB contained eight molecules per asymmetric unit, forming an octamer, and the size-exclusion chromatography experiment also suggested that the enzyme exists as an octamer in solution. The structural analysis of CaPTB identifies the substrate binding mode of the enzyme and comparisons with other acyltransferase structures lead us to speculate that the enzyme undergoes a conformational change upon binding of its substrate.

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과제정보

This research was supported by Kyungpook National University Development Project Research Fund, 2018.

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