Walsh MK, Wang X, Weimer BC. Optimizing the immobilization of single-stranded DNA onto glass beads.
JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 2001;
47:221-31. [PMID:
11245893 DOI:
10.1016/s0165-022x(00)00146-9]
[Citation(s) in RCA: 90] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The attachment of single-stranded DNA to a solid support has many biotechnology and molecular biology applications. This paper compares different immobilization chemistries to covalently link single-stranded DNA (20 base pairs), oligo(1), onto glass beads via a 5'-amino terminal end. Immobilization methods included a one-step 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and a two-step EDC reaction to succinylated and PEG-modified glass beads. The third method used 1,4-phenylene diisothiocyanate to immobilize oligo(1) to aminopropyl glass beads. The influence of coupling buffer, oligo(1) concentration, and EDC concentration was also investigated. The one-step EDC-mediated procedure with succinylated or PEG-modified beads in 0.1 M MES buffer, pH 4.5, resulted in the highest immobilization efficiency, 82-89%. EDC concentrations greater than 50 mM and oligo(1) concentrations of 3 microg/g bead were required for effective immobilization. A complementary oligonucleotide, oligo(2), was able to hybridize to the immobilized oligo(1) with a 58% efficiency. This oligonucleotide was subsequently released at 70 degrees C. The relationship between the surface density of oligo(1) and the hybridization efficiency of the complementary oligonucleotide is described.
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