High affinity nucleic acid ligands to lectins
First Claim
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1. A method for identifying modified, single-stranded ribonucleic acid ligands to a lectin comprising:
- a) contacting a candidate mixture of modified, single-stranded ribonucleic acids with a lectin, said modified ribonucleic acids selected from the group consisting of 2′
-amino (2′
-NH2) modified ribonucleic acids and 2′
-fluoro (2′
-F) modified ribonucleic acids, wherein ribonucleic acids having an increased affinity to said lectin relative to the candidate mixture may be partitioned from the remainder of the candidate mixture;
b) partitioning the increased affinity ribonucleic acids from the remainder of the candidate mixture; and
c) amplifying the increased affinity ribonucleic acids to yield a mixture of ribonucleic acids enriched for ribonucleic acid sequences with relatively high affinity and specificity for binding to said lectin, whereby modified, single-stranded ribonucleic acid ligands to said lectin may be identified.
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Abstract
This invention discloses high-affinity oligonucleotide ligands to lectins, specifically nucleic acid ligands having the ability to bind to the lectins, wheat germ agglutinin, L-selectin and P-selectin. Also disclosed are the methods for obtaining such ligands.
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Citations
50 Claims
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1. A method for identifying modified, single-stranded ribonucleic acid ligands to a lectin comprising:
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a) contacting a candidate mixture of modified, single-stranded ribonucleic acids with a lectin, said modified ribonucleic acids selected from the group consisting of 2′
-amino (2′
-NH2) modified ribonucleic acids and 2′
-fluoro (2′
-F) modified ribonucleic acids, wherein ribonucleic acids having an increased affinity to said lectin relative to the candidate mixture may be partitioned from the remainder of the candidate mixture;
b) partitioning the increased affinity ribonucleic acids from the remainder of the candidate mixture; and
c) amplifying the increased affinity ribonucleic acids to yield a mixture of ribonucleic acids enriched for ribonucleic acid sequences with relatively high affinity and specificity for binding to said lectin, whereby modified, single-stranded ribonucleic acid ligands to said lectin may be identified.
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2. A method for forming a multivalent Complex of nucleic acid ligands to a lectin comprising:
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a) contacting a candidate mixture of nucleic acids with a lectin, wherein nucleic acids having an increased affinity to said lectin relative to the candidate mixture may be partitioned from the remainder of the candidate mixture;
b) partitioning the increased affinity nucleic acids from the remainder of the candidate mixture; and
c) amplifying the increased affinity nucleic acids to yield a mixture of nucleic acids enriched for nucleic acid sequences with relatively higher affinity and specificity for binding to said lectin, whereby nucleic acid ligands to said lectin may be identified; and
d) forming a multivalent Complex comprising two nucleic acid ligands identified in step c).
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3. A method for identifying single-stranded ribonucleic acid ligands and producing modified ribonucleic acid ligands to a lectin comprising:
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a) contacting a candidate mixture of single-stranded ribonucleic acids with a lectin, wherein ribonucleic acids having an increased affinity to said lectin relative to the candidate mixture may be partitioned from the remainder of the candidate mixture;
b) partitioning the increased affinity ribonucleic acids from the remainder of the candidate mixture; and
c) amplifying the increased affinity ribonucleic acids to yield a mixture of single-stranded ribonucleic acids enriched for ribonucleic acid sequences with relatively higher affinity and specificity for binding to said lectin, whereby the ribonucleic acid ligands to said lectin may be identified; and
d) substituting 2′
-O-methyl ribonucleic acids for 2′
-OH ribonucleic acids in the ribonucleic acid ligands identified in step c), whereby the modified ribonucleic acids to a ligand are produced.
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4. A method for identifying nucleic acid ligands and nucleic acid ligand sequences to a lectin comprising:
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a) contacting a candidate mixture of nucleic acids with a lectin, wherein nucleic acids having an increased affinity to said lectin relative to the candidate mixture may be partitioned from the remainder of the candidate mixture;
b) partitioning the increased affinity nucleic acids from the remainder of the candidate mixture; and
c) amplifying the increased affinity nucleic acids to yield a mixture of nucleic acids enriched for nucleic acid sequences with relatively higher affinity and specificity for binding to said lectin, whereby nucleic acid ligands to said lectin may be identified, wherein said lectin is a selectin. - View Dependent Claims (5)
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- 6. A purified and isolated non-naturally occurring nucleic acid ligand to a lectin.
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50. A nucleic acid ligand to a lectin identified according to the method comprising:
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a) contacting a candidate mixture of nucleic acids with a lectin, wherein nucleic acids having an increased affinity to said lectin relative to the candidate mixture may be partitioned from the remainder of the candidate mixture;
b) partitioning the increased affinity nucleic acids from the remainder of the candidate mixture; and
c) amplifying the increased affinity nucleic acids to yield a mixture of nucleic acids enriched for nucleic acid sequences with relatively higher affinity and specificity for binding to said lectin, whereby nucleic acid ligand of said lectin may be identified.
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Specification