Regulatable nucleic acid therapeutic and methods of use thereof
First Claim
1. A regulatable ribozyme molecule comprising a ribozyme sequence which cleaves a separate targeted RNA molecule and a RNA sequence which binds to a ligand, wherein binding of the ligand alters the activity of the ribozyme against the targeted RNA,wherein the regulatable ribozyme molecule is made by the steps ofproviding a random nucleotide sequence of between 20 and 100 nucleotides in length which is to be linked to a sequence with ribozyme activity which cleaves a targeted RNA molecule,amplifying the random sequence under conditions promoting mutation of the random sequence, wherein mutation of the random sequence results in mutated sequences,exposing the mutated sequences to a ligand which is to be used to modify the activity of the ribozyme under conditions favorable to binding of the ribozyme to the ligand,removing mutated sequences not binding to the ligand,repeating the amplification and binding steps until mutated sequences are obtained which bind to the ligand,linking each of the mutated sequences which bind to the ligand to the ribozyme sequence to form ribozyme-ligand binding sequences,exposing the ribozyme ligand binding sequences to ligand, andscreening for alteration of the ribozyme activity when ligand is bound and when ligand is not bound to the ligand binding sequence.
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Abstract
Regulatable RNA molecules such as regulatable ribozymes, nucleic acids encoding such regulatable ribozymes, and methods of making and using such regulatable ribozymes are disclosed. Regulatable ribozymes comprise a ligand-binding RNA sequence and a ribozyme sequence capable of cleaving a separate targeted RNA sequence, wherein upon binding of the ligand to the ligand-binding RNA sequence, the activity of the ribozyme sequence against the targeted RNA sequence is altered. The ligand may be either an inorganic or an organic molecule and may be a co-drug which can be administered to specifically regulate the ribozyme activity. Regulatable RNA molecules other than ribozymes are also disclosed, such as regulatable mRNA molecules which comprise a ligand-binding RNA sequence separate from the coding sequence, wherein upon binding of a ligand to the ligand-binding RNA sequence, translation of the regulatable mRNA is altered.
169 Citations
28 Claims
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1. A regulatable ribozyme molecule comprising a ribozyme sequence which cleaves a separate targeted RNA molecule and a RNA sequence which binds to a ligand, wherein binding of the ligand alters the activity of the ribozyme against the targeted RNA,
wherein the regulatable ribozyme molecule is made by the steps of providing a random nucleotide sequence of between 20 and 100 nucleotides in length which is to be linked to a sequence with ribozyme activity which cleaves a targeted RNA molecule, amplifying the random sequence under conditions promoting mutation of the random sequence, wherein mutation of the random sequence results in mutated sequences, exposing the mutated sequences to a ligand which is to be used to modify the activity of the ribozyme under conditions favorable to binding of the ribozyme to the ligand, removing mutated sequences not binding to the ligand, repeating the amplification and binding steps until mutated sequences are obtained which bind to the ligand, linking each of the mutated sequences which bind to the ligand to the ribozyme sequence to form ribozyme-ligand binding sequences, exposing the ribozyme ligand binding sequences to ligand, and screening for alteration of the ribozyme activity when ligand is bound and when ligand is not bound to the ligand binding sequence.
- 10. A nucleic acid molecule encoding a regulatable ribozyme and a gene.
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15. A method of making a regulatable ribozyme molecule comprising a ribozyme sequence which cleaves a separate targeted RNA molecule and a RNA sequence which binds to a ligand, wherein binding of the ligand alters the activity of the ribozyme against the targeted RNA, comprising the steps of
providing a random nucleotide sequence of between 20 and 100 nucleotides in length which is to be linked to a sequence with ribozyme activity which cleaves a targeted RNA molecule, amplifying the random sequence under conditions promoting mutation of the random sequence, wherein mutation of the random sequence results in mutated sequences, exposing the mutated sequences to a ligand which is to be used to modify the activity of the ribozyme under conditions favorable to binding of the ribozyme to the ligand, removing mutated sequences not binding to the ligand, repeating the amplification and binding steps until mutated sequences are obtained which bind to the ligand, linking each of the mutated sequences which bind to the ligand to the ribozyme sequence to form ribozyme-ligand binding sequences, exposing the ribozyme-ligand binding sequences to ligand, and screening for alteration of the ribozyme activity when ligand is bound and when ligand is not bound to the ligand binding sequence, wherein alteration of ribozyme activity identifies a ribozyme-ligand binding sequence as a regulatable ribozyme molecule.
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17. A method for controlled cleavage of a target RNA molecule in vitro or in an isolated cell comprising providing at the site where the target RNA molecule is to be cleaved
a regulatable ribozyme molecule comprising a ribozyme sequence which cleaves the target RNA molecule and a ligand binding sequence which binds to a ligand, wherein binding of the ligand alters the activity of the ribozyme against the target RNA, wherein cleavage of the targeted RNA molecule is controlled by the presence or absence of the ligand.
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28. A method of making a regulatable ribozyme molecule comprising a ribozyme sequence which cleaves a separate target RNA molecule and a ligand binding sequence which binds to a ligand, wherein binding of the ligand alters the activity of the ribozyme, comprising the steps of
providing a random nucleotide sequence of 20 to 100 nucleotides linked to the ribozyme sequence, amplifying the random sequence under conditions promoting mutation of the random sequence, wherein mutation of the random sequence results in mutated sequences, exposing the mutated sequences to the ligand under conditions favorable to binding of the mutated sequences to the ligand, removing mutated sequences not binding to the ligand, repeating the amplifying and exposing steps until mutated sequences are obtained which bind to the ligand, wherein the mutated sequences which bind to the ligand are ligand binding sequences and wherein the ligand binding sequences and the ribozyme sequence together are ribozyme-ligand binding molecules, exposing the ribozyme-ligand binding molecules to ligand, and screening for alteration of the ribozyme activity when ligand is bound and when ligand is not bound to the ligand binding sequence, wherein alteration of ribozyme activity identifies a ribozyme-ligand binding sequence as a regulatable ribozyme molecule.
Specification