Nastasijevic B, Becker NA, Wurster SE, Maher LJ. Sequence-specific binding of DNA and RNA to immobilized Nickel ions.
Biochem Biophys Res Commun 2007;
366:420-5. [PMID:
18068116 DOI:
10.1016/j.bbrc.2007.11.169]
[Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2007] [Accepted: 11/23/2007] [Indexed: 10/22/2022]
Abstract
Immobilization of divalent Nickel cations provides a tool for affinity purification of proteins containing hexahistidine tags. During experiments to generate single-stranded DNA aptamers to immobilized proteins we inadvertently identified DNA sequences with affinity for Nickel-nitrilotriacetic acid (Ni(2+)-NTA) magnetic beads. Analysis of these aptamers revealed that affinity for the Ni(2+)-NTA support requires only single-stranded sequences with multiple adenosine residues. Bound nucleic acids can be eluted with imidazole. A single-stranded dA(20) affinity tag (but not other homopolymer sequences) is sufficient for immobilization of double-stranded DNA PCR products on Ni(2+)-NTA magnetic beads. Addition of an rA(20) sequence to an RNA transcript allowed its affinity capture on Ni(2+)-NTA magnetic beads, suggesting an approach for purification of poly(A) mRNA.
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