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• W2104454968 endingPage "1932" @default.
• W2104454968 startingPage "1923" @default.
• W2104454968 abstract "The PAR subfamily of basic leucine zipper (bZIP) factors comprises three proteins (VBP/TEF, DBP, and HLF) that have conserved basic regions flanked by proline- and acidic-amino-acid-rich (PAR) domains and functionally compatible leucine zipper dimerization domains. We show that VBP preferentially binds to sequences that consist of abutted GTAAY half-sites (which we refer to as PAR sites) as well as to sequences that contain either a C/EBP half-site (GCAAT) or a CREB/ATF half-site (GTCAT) in place of one of the PAR half-sites. Since the sequences that we describe as PAR sites and PAR-CREB/ATF chimeric sites, respectively, were both previously described as high-affinity binding sites for the E4BP4 transcriptional repressor, we infer that these sequences may be targets for positive and negative regulation. Similarly, since the sequences that we describe as PAR-C/EBP and PAR-CREB/ATF chimeric sites are known to be high-affinity binding sites for C/EBP and CREB/ATF factors, respectively, we infer that these sites may each be targets for multiple subfamilies of bZIP factors. To gain insights regarding the molecular basis for the binding-site specificity of PAR factors, we also carried out an extensive mutational analysis of VBP. By substituting five amino acid residues that differ between the Drosophila giant bZIP factor and the vertebrate PAR bZIP factors, we show that the fork region, which bridges the basic and leucine zipper domains, contributes to half-site sequence specificity. In addition, we report that at least two domains amino terminal to the core basic region are required for VBP to bind to the full spectrum of PAR target sites. Thus, whereas direct base contacts may be restricted to basic-region residues (as indicated by GCN4-DNA crystal structures), several other domains also influence the DNA-binding specificity of PAR bZIP proteins." @default.
• W2104454968 created "2016-06-24" @default.
• W2104454968 creator A5046123003 @default.
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• W2104454968 date "1995-04-01" @default.
• W2104454968 modified "2023-10-13" @default.
• W2104454968 title "DNA-binding specificity of the PAR basic leucine zipper protein VBP partially overlaps those of the C/EBP and CREB/ATF families and is influenced by domains that flank the core basic region" @default.
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• W2104454968 doi "https://doi.org/10.1128/mcb.15.4.1923" @default.
• W2104454968 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/230418" @default.
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• W2104454968 hasPublicationYear "1995" @default.
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