Difference between revisions of "Part:BBa K4324101"

 
 
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<partinfo>BBa_K4324101 short</partinfo>
 
<partinfo>BBa_K4324101 short</partinfo>
  
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This CDS codes for xylitol dehydrogenase (XDH).
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This part is the CDS of the XYL2 gene from S. cerevisiae that induces xylitol dehydrogenase, and has been codon-optimised for expression in E. coli.
  
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XDH is an enzyme that allows the conversion of xylitol to xylulose, and vice versa, according to the following chemical equation:
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[[Image: Xylitol_dehydrogenase_structure.png|200px|thumb|right|'''Figure 1:''' Protein structure of xylitol dehydrogenase from [https://alphafold.ebi.ac.uk/entry/Q07993 AlphaFold]]]
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xylitol + NAD+ &#8652; D-xylulose + NADH + H+
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In S. cerevisiae yeast cells, XDH forms the second process in the XR-XDH pathway, which converts xylose into xylulose via xylitol. Xylulose is then converted into xylulose-5-phosphate (X5P) for further metabolism in the pentose phosphate pathway.
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<!-- Add more about the biology of this part here
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===Usage and Biology===
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<partinfo>BBa_K4324101 SequenceAndFeatures</partinfo>
 
<partinfo>BBa_K4324101 SequenceAndFeatures</partinfo>
  
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===Usage and Biology===
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Our project focused on the improvement of xylose utilisation in E. coli. One part of this process was to incorporate a yeast-derived XR-XDH pathway
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[[Image:Xylose_metabolism_pathways.jpeg|600px|thumb|center|'''Figure 2:''' Xylose metabolism pathways of various microorganisms, from [https://biotechnologyforbiofuels.biomedcentral.com/articles/10.1186/s13068-020-1662-x Biochemical routes for uptake and conversion of xylose by microorganisms] by Zhao, Z., Xian, M., Liu, M. et al.]]
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Xylitol dehydrogenase ([https://www.genome.jp/dbget-bin/www_bget?ec:1.1.1.9 EC 1.1.1.9]), an oxidoreductase, is an enzyme that serves as a catalyst for the conversion of xylitol into xylulose, and vice versa, according to the following chemical equation:
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<center>'''xylitol + NAD ⇌ D-xylulose + NADH + H<sup>+</sup>'''</center>
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In S. cerevisiae yeast cells, xylitol dehydrogenase forms the second process in the XR-XDH pathway, as shown in Figure 2, which converts xylose into xylulose via xylitol. Xylulose is then converted into xylulose-5-phosphate (X5P) for further metabolism in the pentose phosphate pathway.
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E. coli do not exhibit the XR-XDH pathway, instead having an XI pathway that directly converts xylose into xylulose. Hence, together with xylose reductase ([https://parts.igem.org/Part:BBa_K4324100 '''BBa_K4324100''']) which can convert xylose to xylitol, xylitol dehydrogenase presents an alternate xylose metabolism pathway for E. coli.
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Furthermore, xylitol dehydrogenase enables E. coli to utilise xylitol as an energy source through its direct conversion to xylulose, which then follows the pentose phosphate pathway.
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==References==
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1. https://www.uniprot.org/uniprotkb/Q07993/entry<br>
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2. https://biotechnologyforbiofuels.biomedcentral.com/articles/10.1186/s13068-020-1662-x
  
 
<!-- Uncomment this to enable Functional Parameter display  
 
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Latest revision as of 14:20, 12 October 2022


Xylitol Dehydrogenase from S. cerevisiae

This part is the CDS of the XYL2 gene from S. cerevisiae that induces xylitol dehydrogenase, and has been codon-optimised for expression in E. coli.

Figure 1: Protein structure of xylitol dehydrogenase from AlphaFold

Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    COMPATIBLE WITH RFC[12]
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BglII site found at 606
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    COMPATIBLE WITH RFC[25]
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal BsaI.rc site found at 263

Usage and Biology

Our project focused on the improvement of xylose utilisation in E. coli. One part of this process was to incorporate a yeast-derived XR-XDH pathway

Figure 2: Xylose metabolism pathways of various microorganisms, from Biochemical routes for uptake and conversion of xylose by microorganisms by Zhao, Z., Xian, M., Liu, M. et al.

Xylitol dehydrogenase (EC 1.1.1.9), an oxidoreductase, is an enzyme that serves as a catalyst for the conversion of xylitol into xylulose, and vice versa, according to the following chemical equation:

xylitol + NAD ⇌ D-xylulose + NADH + H+

In S. cerevisiae yeast cells, xylitol dehydrogenase forms the second process in the XR-XDH pathway, as shown in Figure 2, which converts xylose into xylulose via xylitol. Xylulose is then converted into xylulose-5-phosphate (X5P) for further metabolism in the pentose phosphate pathway.

E. coli do not exhibit the XR-XDH pathway, instead having an XI pathway that directly converts xylose into xylulose. Hence, together with xylose reductase (BBa_K4324100) which can convert xylose to xylitol, xylitol dehydrogenase presents an alternate xylose metabolism pathway for E. coli.

Furthermore, xylitol dehydrogenase enables E. coli to utilise xylitol as an energy source through its direct conversion to xylulose, which then follows the pentose phosphate pathway.

References

1. https://www.uniprot.org/uniprotkb/Q07993/entry
2. https://biotechnologyforbiofuels.biomedcentral.com/articles/10.1186/s13068-020-1662-x