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Detection of soluble co-factor dependent protein expression in vivo: Application to the 4′-phosphopantetheinyl transferase PptT from Mycobacterium tuberculosis.

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Title: Detection of soluble co-factor dependent protein expression in vivo: Application to the 4′-phosphopantetheinyl transferase PptT from Mycobacterium tuberculosis.
Authors: Rottier, Karine1,2, Faille, Alexandre1,2, Prudhomme, Thomas1,2, Leblanc, Cécile1,2, Chalut, Christian1,2, Cabantous, Stéphanie3,4,5, Guilhot, Christophe1,2, Mourey, Lionel1,2, Pedelacq, Jean-Denis1,2 Jean-Denis.Pedelacq@ipbs.fr
Source: Journal of Structural Biology. Sep2013, Vol. 183 Issue 3, p320-328. 9p.
Subjects: Gene expression in bacteria, Phosphopantetheine, Mycobacterium tuberculosis, Transferases, Cofactors (Biochemistry), Escherichia coli, Precipitation (Chemistry), Polyketide synthases
Abstract: Abstract: The need for early-on diagnostic tools to assess the folding and solubility of expressed protein constructs in vivo is of great interest when dealing with recalcitrant proteins. In this paper, we took advantage of the picomolar sensitivity of the bipartite GFP1–10/GFP11 system to investigate the solubility of the Mycobacterium tuberculosis 4′-phosphopantetheinyl transferase PptT, an enzyme essential for the viability of the tubercle bacillus. In vivo and in vitro complementation assays clearly showed the improved solubility of the full-length PptT compared to its N- and C-terminally truncated counterparts. However, initial attempts to purify the full-length enzyme overexpressed in Escherichia coli cells were hampered by aggregation issues overtime that caused the protein to precipitate within hours. The fact that the naturally occurring Coenzyme A and Mg2+, essentials for PptT to carry out its function, could play a role in stabilizing the enzyme was confirmed using DSF experiments. In vitro activity assays were performed using the ACP substrate from the type I polyketide synthase PpsC from M. tuberculosis, a 2188 amino-acid enzyme that plays a major role in the virulence and pathogenicity of this microbial pathogen. We selected the most soluble and compact ACP fragment (2042–2188), identified by genetic selection of in-frame fragments from random library experiments, to monitor the transfer of the P-pant moiety from Coenzyme A onto a conserved serine residue of this ACP domain. [Copyright &y& Elsevier]
Copyright of Journal of Structural Biology is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Detection of soluble co-factor dependent protein expression in vivo: Application to the 4′-phosphopantetheinyl transferase PptT from Mycobacterium tuberculosis.
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  Data: <searchLink fieldCode="AR" term="%22Rottier%2C+Karine%22">Rottier, Karine</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Faille%2C+Alexandre%22">Faille, Alexandre</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Prudhomme%2C+Thomas%22">Prudhomme, Thomas</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Leblanc%2C+Cécile%22">Leblanc, Cécile</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Chalut%2C+Christian%22">Chalut, Christian</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Cabantous%2C+Stéphanie%22">Cabantous, Stéphanie</searchLink><relatesTo>3,4,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Guilhot%2C+Christophe%22">Guilhot, Christophe</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Mourey%2C+Lionel%22">Mourey, Lionel</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Pedelacq%2C+Jean-Denis%22">Pedelacq, Jean-Denis</searchLink><relatesTo>1,2</relatesTo><i> Jean-Denis.Pedelacq@ipbs.fr</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Structural+Biology%22">Journal of Structural Biology</searchLink>. Sep2013, Vol. 183 Issue 3, p320-328. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Gene+expression+in+bacteria%22">Gene expression in bacteria</searchLink><br /><searchLink fieldCode="DE" term="%22Phosphopantetheine%22">Phosphopantetheine</searchLink><br /><searchLink fieldCode="DE" term="%22Mycobacterium+tuberculosis%22">Mycobacterium tuberculosis</searchLink><br /><searchLink fieldCode="DE" term="%22Transferases%22">Transferases</searchLink><br /><searchLink fieldCode="DE" term="%22Cofactors+%28Biochemistry%29%22">Cofactors (Biochemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Escherichia+coli%22">Escherichia coli</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Polyketide+synthases%22">Polyketide synthases</searchLink>
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  Data: Abstract: The need for early-on diagnostic tools to assess the folding and solubility of expressed protein constructs in vivo is of great interest when dealing with recalcitrant proteins. In this paper, we took advantage of the picomolar sensitivity of the bipartite GFP1–10/GFP11 system to investigate the solubility of the Mycobacterium tuberculosis 4′-phosphopantetheinyl transferase PptT, an enzyme essential for the viability of the tubercle bacillus. In vivo and in vitro complementation assays clearly showed the improved solubility of the full-length PptT compared to its N- and C-terminally truncated counterparts. However, initial attempts to purify the full-length enzyme overexpressed in Escherichia coli cells were hampered by aggregation issues overtime that caused the protein to precipitate within hours. The fact that the naturally occurring Coenzyme A and Mg2+, essentials for PptT to carry out its function, could play a role in stabilizing the enzyme was confirmed using DSF experiments. In vitro activity assays were performed using the ACP substrate from the type I polyketide synthase PpsC from M. tuberculosis, a 2188 amino-acid enzyme that plays a major role in the virulence and pathogenicity of this microbial pathogen. We selected the most soluble and compact ACP fragment (2042–2188), identified by genetic selection of in-frame fragments from random library experiments, to monitor the transfer of the P-pant moiety from Coenzyme A onto a conserved serine residue of this ACP domain. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Journal of Structural Biology is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.jsb.2013.07.010
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 320
    Subjects:
      – SubjectFull: Gene expression in bacteria
        Type: general
      – SubjectFull: Phosphopantetheine
        Type: general
      – SubjectFull: Mycobacterium tuberculosis
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      – SubjectFull: Transferases
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      – SubjectFull: Cofactors (Biochemistry)
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      – SubjectFull: Escherichia coli
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      – SubjectFull: Precipitation (Chemistry)
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      – SubjectFull: Polyketide synthases
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      – TitleFull: Detection of soluble co-factor dependent protein expression in vivo: Application to the 4′-phosphopantetheinyl transferase PptT from Mycobacterium tuberculosis.
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              Text: Sep2013
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