A phosphotyrosine-imprinted polymer receptor for the recognition of tyrosine phosphorylated peptides.
Hyperphosphorylation at tyrosine is commonly observed in tumor proteomes and, hence, specific phosphoproteins or phosphopeptides could serve as markers useful for cancer diagnostics and therapeutics. The analysis of such targets is, however, a challenging task, because of their commonly low abundance and the lack of robust and effective preconcentration techniques. As a robust alternative to the commonly used immunoaffinity techniques that rely on phosphotyrosine(pTyr)-specific antibodies, we have developed an epitope-imprinting strategy that leads to a synthetic pTyr-selective imprinted polymer receptor. The binding site incorporates two monourea ligands placed by preorganization around a pTyr dianion template. The tight binding site displayed good binding affinities for the pTyr template, in the range of that observed for corresponding antibodies, and a clear preference for pTyr over phosphoserine (pSer). In further analogy to the antibodies, the imprinted polymer was capable of capturing short tyrosine phosphorylated peptides in the presence of an excess of their non-phosphorylated counterparts or peptides phosphorylated at serine.
Emgenbroich
Marco
M
INFU, Technische Universität Dortmund, Otto Hahn Strasse 6, 44221 Dortmund (Germany). borje@infu.uni-dortmund.de
Borrelli
Cristiana
C
Shinde
Sudhirkumar
S
Lazraq
Issam
I
Vilela
Filipe
F
Hall
Andrew J
AJ
Oxelbark
Joakim
J
De Lorenzi
Ersilia
E
Courtois
Julien
J
Simanova
Anna
A
Verhage
Jeroen
J
Irgum
Knut
K
Karim
Kal
K
Sellergren
Börje
B
D008958:Models, Molecular; D054802:Molecular Imprinting; D015394:Molecular Structure; D010455:Peptides / Q000737:chemistry*; D019000:Phosphotyrosine / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014508:Urea / Q000737:chemistry
D010455:Peptides; D011108:Polymers; D019000:Phosphotyrosine; D014508:Urea