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Team:TU-Eindhoven/ProteinSelection
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==CEST Based Marker Proteins== | ==CEST Based Marker Proteins== | ||
| - | {{:Team:TU-Eindhoven/Template:Lead}}To create bacteria with the ability to generate contrast on a CEST MRI scan, polypeptides that have that ability had to be found. Various solutions based on short Lysine, Arganine, Threonine or Serine rich sequences were proposed.{{:Team:TU-Eindhoven/Template:Ref | id=McMahonDIACEST | author=M.T. McMahon | title=New "Multicolor" Polypeptide Diamagnetic Chemical Exchange Saturation Transfer (DIACEST) Contrast Agents for MRI | journal=Magnetic Resonance in Medicine | edition=60 | pages=803-812 | year=2008 }} However, it is hard to predict how well these sequences will express in bacteria and whether they are sufficiently stable in vivo. To avoid these problems a new approach was taken. The suitability as a CEST | + | {{:Team:TU-Eindhoven/Template:Lead}}To create bacteria with the ability to generate contrast on a CEST MRI scan, polypeptides that have that ability had to be found. Various solutions based on short Lysine, Arganine, Threonine or Serine rich sequences were proposed.{{:Team:TU-Eindhoven/Template:Ref | id=McMahonDIACEST | author=M.T. McMahon | title=New "Multicolor" Polypeptide Diamagnetic Chemical Exchange Saturation Transfer (DIACEST) Contrast Agents for MRI | journal=Magnetic Resonance in Medicine | edition=60 | pages=803-812 | year=2008 }} However, it is hard to predict how well these sequences will express in bacteria and whether they are sufficiently stable in vivo. To avoid these problems a new approach was taken. The suitability as a CEST based marker was estimated for proteins of which the structure is already clarified.{{:Team:TU-Eindhoven/Template:LeadEnd}} |
===Scanning for Candidates=== | ===Scanning for Candidates=== | ||
| - | To find suitable proteins the [http://www.pdb.org RCSB Protein Data Bank] was queried for all entries containing proteins. This was done using the SEARCH Web Service of PDB.org, for the XML query used see [[Team:TU-Eindhoven/Code:PDBQuery#query.xml | query.xml]]. | + | For good CEST contrast a protein should have a high Lysine or Arganine content.{{:Team:TU-Eindhoven/Template:RefAgain | id=McMahonDIACEST }}{{:Team:TU-Eindhoven/Template:Ref | id=GiladArtificialGene | author=A.A. Gilad | title=Artificial reporter gene providing MRI contrast based on proton exchange. | journal=Nature biotechnology | edition=25.2 | pages=217-219 | year=2007 }} To find suitable proteins the [http://www.pdb.org RCSB Protein Data Bank] was queried for all entries containing proteins. This was done using the SEARCH Web Service of PDB.org, for the XML query used see [[Team:TU-Eindhoven/Code:PDBQuery#query.xml | query.xml]]. A Python program was written to analyse the obtained amino acid sequences and calculate the ratio of Lysine or Arganine to the total chain length (see [[Team:TU-Eindhoven/Code:PDBQuery#query.xml | PDB.py]] and [[Team:TU-Eindhoven/Code:PDBQuery#query.xml | queryPDB.py]]). |
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==References== | ==References== | ||
Revision as of 12:51, 2 July 2013
CEST Based Marker Proteins
To create bacteria with the ability to generate contrast on a CEST MRI scan, polypeptides that have that ability had to be found. Various solutions based on short Lysine, Arganine, Threonine or Serine rich sequences were proposed.McMahonDIACESTM.T. McMahon, New "Multicolor" Polypeptide Diamagnetic Chemical Exchange Saturation Transfer (DIACEST) Contrast Agents for MRI. Magnetic Resonance in Medicine 60, 803-812 (2008) However, it is hard to predict how well these sequences will express in bacteria and whether they are sufficiently stable in vivo. To avoid these problems a new approach was taken. The suitability as a CEST based marker was estimated for proteins of which the structure is already clarified.
Scanning for Candidates
For good CEST contrast a protein should have a high Lysine or Arganine content.McMahonDIACESTGiladArtificialGeneA.A. Gilad, Artificial reporter gene providing MRI contrast based on proton exchange.. Nature biotechnology 25.2, 217-219 (2007) To find suitable proteins the [http://www.pdb.org RCSB Protein Data Bank] was queried for all entries containing proteins. This was done using the SEARCH Web Service of PDB.org, for the XML query used see query.xml. A Python program was written to analyse the obtained amino acid sequences and calculate the ratio of Lysine or Arganine to the total chain length (see PDB.py and queryPDB.py).
References
