Part:BBa_K3349001

Pectin Lyase PelB

This Pectin Lyase is a protein from Paenibacillus amylolyticus . With Pnl and PelC, PelB is able to cleave and therefore breakdown pectin or homogalacturonan substrates. This protein has been characterized to cleave methylated pectin (at unmethylated sites) and polygalacturonic acid. Studies by Keggi and Doran-Peterson, PelB has a Km of 50.1+/- 140 mg/ml and a Vmax of 745 +/-2024 IU/mg with a 80% methylated substrate. The optimal temperature for PelB activity was determined to be 70°C [1].

A hexahistidine tag was added onto the C-terminus for nickel affinity purification. For more information, please visit our website https://2020.igem.org/Team:Lethbridge_HS.

Although this enzyme is already fairly thermostable, we decided to do homology modelling if we were to apply our modelling protocol to make a new PelB thermostable variant.

Figure 2:Homology modelling of PelB from P. amylolyticus. The protein structure was done using iTASSER [2] and SWISS-Model [3]. The two structures were then aligned and compared. A more in depth analysis can be found on our webpage.

For wetlab results we were able to start preparing for subcloning our parts into pSB1C3. The following Figure shows our digestion of the genes from pUC57-Kan using EcoRI and PstI.

<img src= "https://2020.igem.org/wiki/images/c/c9/T--Lethbridge_HS--insertdigest2020.png” alt="pnl modelling" style="width:700px;height:300px;">

Figure 3: Restriction digest of PelB and PelC DNA from the pUC57 plasmid using EcoRI and PstI enzymes run on a 1% agarose gel. The red boxes show the band corresponding to that of our DNA constructs.

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 261
  Illegal BamHI site found at 1146
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]