DNA catalysts with tyrosine kinase activity.
DNA catalysts with tyrosine kinase activity.
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DOI:
10.1021/ja407586u
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发表时间:
2013-10-09
影响因子:
15
通讯作者:
Silverman SK
中科院分区:
文献类型:
--
作者:
Walsh SM;Sachdeva A;Silverman SK
We show that DNA catalysts (deoxyribozymes, DNA enzymes) can phosphorylate tyrosine residues of peptides. Using in vitro selection, we identified deoxyribozymes that transfer the γ-phosphoryl group from a 5′-triphosphorylated donor (a pppRNA oligonucleotide or GTP) to the tyrosine hydroxyl acceptor of a tethered hexapeptide. Tyrosine kinase deoxyribozymes that use pppRNA were identified from each of N30, N40, and N50 random-sequence pools. Each deoxyribozyme requires Zn2+, and most additionally require Mn2+. The deoxyribozymes have little or no selectivity for the amino acid identities near the tyrosine, but they are highly selective for phosphorylating tyrosine rather than serine. Analogous GTP-dependent DNA catalysts were identified and found to have apparent Km(GTP) as low as ca. 20 μM. These findings establish that DNA has the fundamental catalytic ability to phosphorylate the tyrosine side chain of a peptide substrate.
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