Abstract:
:Using an immunochemical approach, we have identified a unique antigen, PEP (protein on ecdysone puffs), which is associated in third-instar larvae with the active ecdysone-regulated loci on polytene chromosomes; PEP is not associated with most intermolt puffs and is found on some, but not all, heat shock-induced puffs. The distribution pattern changes with changing puffing patterns in the developmental program. We have screened an expression library and recovered a cDNA clone encoding PEP. PEP possesses multiple potential nucleic acid- and protein- binding regions: a glycine- and asparagine-rich amino terminus, four zinc finger motifs, two very acidic segments, two short basic stretches, and an alanine- and proline-rich carboxyl terminus. The Pep gene maps by in situ hybridization to the cytological locus 74F, adjacent to the early ecdysone-responsive region; however, the gene is not regulated by ecdysone at the level of transcription. The pattern of Pep expression through development suggests that maternal Pep gene transcripts are supplied to the embryo, and that the abundance of Pep gene transcripts decreases to a lower, fairly constant level thereafter. This unusual protein may play a role in the process of gene activation, or possibly in RNA processing, for a defined set of developmentally regulated loci.
journal_name
Genes Devjournal_title
Genes & developmentauthors
Amero SA,Elgin SC,Beyer ALdoi
10.1101/gad.5.2.188subject
Has Abstractpub_date
1991-02-01 00:00:00pages
188-200issue
2eissn
0890-9369issn
1549-5477journal_volume
5pub_type
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journal_title:Genes & development
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pub_type: 杂志文章
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journal_title:Genes & development
pub_type: 杂志文章
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更新日期:2005-07-01 00:00:00
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journal_title:Genes & development
pub_type: 杂志文章
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journal_title:Genes & development
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journal_title:Genes & development
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journal_title:Genes & development
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更新日期:2000-06-15 00:00:00
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journal_title:Genes & development
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journal_title:Genes & development
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