Nucleic acid probe linked to a label having a terminal cysteine
First Claim
1. A labeled probe comprising a polynucleotide sequence complementary to a target polynucleotide sequence, a label, including aterminal cysteine residue, and a linkage group, the label and linkage group not interfering substantially with the characteristic ability of the probe polynucleotide sequence to hybridize to the target polynucleotide sequence, the label being covalently attached to the linkage group through a sulfur-carbon single bond, the sulfur atom of which is part of the terminal cysteine residue of the label, and the linkage group being covalently attached to the polynucleotide sequence through a carbon-oxygen single bond.
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Abstract
A polynucleotide probe with a label bearing a plurality of signalling moieties. The label is attached to the probe by the reaction of an amino and sulfhydryl reactive hetero bifunctional reagent with the probe and label, the reaction resulting in the oxidation of a sulfhydryl group of the label. The label may be attached to the 5'"'"' terminus of the probe, or to modified bases of the probe. Probes constructed according to the invention are useful in detecting target sequences in genomic DNA.
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7 Claims
- 1. A labeled probe comprising a polynucleotide sequence complementary to a target polynucleotide sequence, a label, including aterminal cysteine residue, and a linkage group, the label and linkage group not interfering substantially with the characteristic ability of the probe polynucleotide sequence to hybridize to the target polynucleotide sequence, the label being covalently attached to the linkage group through a sulfur-carbon single bond, the sulfur atom of which is part of the terminal cysteine residue of the label, and the linkage group being covalently attached to the polynucleotide sequence through a carbon-oxygen single bond.
Specification