Bulletin of the Korean Chemical Society

  • 제33권8호
  • /
  • Pages.2508-2512
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  • 2012
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Purification and Structural Characterization of Cold Shock Protein from Listeria monocytogenes

  • Lee, Ju-Ho (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Jeong, Ki-Woong (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Kim, Yang-Mee (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University)
  • 투고 : 2012.04.05
  • 심사 : 2012.04.30
  • 발행 : 2012.08.20
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초록

Cold shock proteins (CSPs) are a family of proteins induced at low temperatures. CSPs bind to single-stranded nucleic acids through the ribonucleoprotein 1 and 2 (RNP 1 and 2) binding motifs. CSPs play an essential role in cold adaptation by regulating transcription and translation via molecular chaperones. The solution nuclear magnetic resonance (NMR) or X-ray crystal structures of several CSPs from various microorganisms have been determined, but structural characteristics of psychrophilic CSPs have not been studied. Therefore, we optimized the purification process to obtain highly pure Lm-Csp and determined the three-dimensional structure model of Lm-Csp by comparative homology modeling using MODELLER on the basis of the solution NMR structure of Bs-CspB. Lm-Csp consists of a ${\beta}$-barrel structure, which includes antiparallel ${\beta}$ strands (G4-N10, F15-I18, V26-H29, A46-D50, and P58-Q64). The template protein, Bs-CspB, shares a similar ${\beta}$ sheet structure and an identical chain fold to Lm-Csp. However, the sheets in Lm-Csp were much shorter than those of Bs-CspB. The Lm-Csp side chains, E2 and R20 form a salt bridge, thus, stabilizing the Lm-Csp structure. To evaluate the contribution of this ionic interaction as well as that of the hydrophobic patch on protein stability, we investigated the secondary structures of wild type and mutant protein (W8, F15, and R20) of Lm-Csp using circular dichroism (CD) spectroscopy. The results showed that solvent-exposed aromatic side chains as well as residues participating in ionic interactions are very important for structural stability. Further studies on the three-dimensional structure and dynamics of Lm-Csp using NMR spectroscopy are required.

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피인용 문헌

  1. Resistance of Listeria monocytogenes to Stress Conditions Encountered in Food and Food Processing Environments vol.9, pp.1664-302X, 2018, https://doi.org/10.3389/fmicb.2018.02700
  2. Adaptive Response of Listeria monocytogenes to the Stress Factors in the Food Processing Environment vol.12, pp.None, 2012, https://doi.org/10.3389/fmicb.2021.710085