ISSN:
1744-313X
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Biologie
,
Medizin
Notizen:
Rearrangements of immunoglobulin genes are mediated by highly conserved heptamer and nonamer recombinational signal sequence. Using a protein-blotting procedure, a heptamer and nonamer recombinational signal sequence-specific DNA-binding protein(s) was examined in the nuclear extracts from lymphoid and nonlymphoid cell lines. Nuclear extracts were subjected to SDS-polyacrylamide gel electrophoresis, and transferred by electroblotting to nitrocellulose filters. Then the filters were hybridized to *P-labelled synthetic double-stranded heptamer-23bp-nonamer or nonamer- l2bp-heptamer recombinational signal sequence probes. A relatively large amount of a DNA-binding protein(s) of M, 115,000 for both probes was detected in the nuclear extracts from immature B and immature T cell lines. No DNA-binding proteins were detected in a myeloma cell line. Interestingly, this DNA-binding protein(s) might be able to recognize both heptamer and nonamer. Recombinational signal sequence-specific DNA-binding activity of the protein(s) and the presence of the protein(s) in a stage-specific manner strongly suggest that the protein(s) of M, 115,000 detected here may play an important role in the recombination of Ig and TCR genes.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1744-313X.1990.tb00860.x
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