Merozoite surface protein 1 lacking glycosylation sites
First Claim
1. A composition comprising a merozoite surface protein 1 (MSP-1) or fragment thereof, wherein at least one glycosylation site of the merozoite surface protein 1 (MSP-1) or fragment thereof has been eliminated.
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Accused Products
Abstract
The invention provides modified recombinant nucleic acid sequences (preferably DNA) and methods for increasing the mRNA levels and protein expression of malarial surface protein MSP-1 which is known to be difficult to express in cell culture systems, mammalian cell culture systems, or in transgenic animals. The preferred protein candidates for expression using the recombinant techniques of the invention are MSP-1 proteins expressed from DNA coding sequences comprising reduced overall AT content or AT rich regions and/or mRNA instability motifs and/or rare codons relative to the native MSP-1 gene.
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Citations
27 Claims
- 1. A composition comprising a merozoite surface protein 1 (MSP-1) or fragment thereof, wherein at least one glycosylation site of the merozoite surface protein 1 (MSP-1) or fragment thereof has been eliminated.
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2. A composition comprising a merozoite surface protein 1 (MSP-1) or fragment thereof, wherein all of the glycosylation sites of the merozoite surface protein 1 (MSP-1) or fragment thereof have been eliminated.
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6. A composition comprising a merozoite surface protein 1 (MSP-1) or fragment thereof produced by:
providing a non-human transgenic mammal whose genome comprises a modified SEQ ID NO;
2 encoding the MSP-1 or fragment thereof operably linked to a mammary gland promoter, wherein the modification reduces the AT content of SEQ ID NO;
2 to 50% or less by replacement of protozoan codons with codons preferred by mammalian cells, wherein the replacement codons each encode the same amino acid as the replaced codon; and
allowing the transgenic mammal to express said modified SEQ ID NO;
2, thereby producing MSP-1 in its milk, wherein the MSP-1 or fragment thereof lacks at least one glycosylation site.- View Dependent Claims (7, 8, 9, 10, 11)
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12. A composition comprising a merozoite surface protein 1 (MSP-1) or fragment thereof produced by:
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providing a non-human transgenic mammal whose genome comprises a modified SEQ ID NO;
2 encoding the MSP-1 or fragment thereof operably linked to a mammary gland promoter, wherein the modification eliminates all the mRNA instability motifs in said SEQ ID NO;
2 by replacement of protozoan codons with codons preferred by mammalian cells, and wherein the replacement codons each encode the same amino acid as the replaced codon; andallowing the transgenic mammal to express said modified SEQ ID NO;
2, thereby producing MSP-1 in its milk,wherein the MSP-1 or fragment thereof lacks at least one glycosylation site. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A composition comprising a merozoite surface protein 1 (MSP-1) or fragment thereof produced by:
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providing a non-human transgenic mammal whose genome comprises a modified SEQ ID NO;
2 encoding the MSP-1 or fragment thereof operably linked to a mammary gland promoter, wherein the nucleic acid has been modified by a) elimination of mRNA instability motifs by the replacement of protozoan codons in SEQ ID NO;
2 with codons preferred by mammalian cells and b) reduction of the AT content of SEQ ID NO;
2 to 50% or less by replacement of protozoan codons with codons preferred by mammalian cells, wherein the replacement codons each encode the same amino acid as the replaced codon; andallowing the transgenic mammal to express said modified SEQ ID NO;
2, thereby producing MSP-1 in its milk,wherein the MSP-1 or fragment thereof lacks at least one glycosylation site. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification