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Photochemical cross-linking of psoralen-derivatized oligonucleoside methylphosphonates to rabbit globin messenger RNA.

Abstract：

:Antisense oligodeoxyribonucleoside methylphosphonates targeted against various regions of mRNA or precursor mRNA are selective inhibitors of mRNA expression both in cell-free systems and in cells in culture. The efficiency with which methylphosphonate oligomers interact with mRNA, and thus inhibit translation, can be considerably increased by introducing photoactivatable psoralen derivatives capable of cross-linking with the mRNA. Oligonucleoside methylphosphonates complementary to coding regions of rabbit alpha- or beta-globin mRNA were derivatized with 4'-(aminoalkyl)-4,5',8-trimethylpsoralens by attaching the psoralen group to the 5' end of the oligomer via a nuclease-resistant phosphoramidate linkage. The distance between the psoralen group and the 5' end of the oligomer can be adjusted by changing the number of methylene groups in the aminoalkyl linker arm. The psoralen-derivatized oligomers specifically cross-link to their complementary sequences on the targeted mRNA. For example, an oligomer complementary to nucleotides 56-67 of alpha-globin mRNA specifically cross-linked to alpha-globin mRNA upon irradiation of a solution of the oligomer and rabbit globin mRNA at 4 degrees C. Oligomers derivatized with 4'-[[N-(2-amino-ethyl)amino]methyl]-4,5',8-trimethylpsoralen gave the highest extent of cross-linking to mRNA. The extent of cross-linking was also determined by the chain length of the oligomer and the structure of the oligomer binding site. Oligomers complementary to regions of mRNA that are sensitive to hydrolysis by single-strand-specific nucleases cross-linked to an approximately 10-30-fold greater extent than oligomers complementary to regions that are insensitive to nuclease hydrolysis.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Biochemistry

journal_title

Biochemistry

authors

Kean JM,Murakami A,Blake KR,Cushman CD,Miller PS

doi

10.1021/bi00426a008

subject

Has Abstract

pub_date

1988-12-27 00:00:00

pages

9113-21

issue

26

eissn

0006-2960

issn

1520-4995

journal_volume

27

pub_type

杂志文章

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