PMID- 10364449 OWN - NLM STAT- MEDLINE DCOM- 19990716 LR - 20161124 IS - 0006-291X (Print) IS - 0006-291X (Linking) VI - 259 IP - 3 DP - 1999 Jun 16 TI - DNA binding and transactivating properties of the paired and homeobox protein Pax4. PG - 510-8 AB - Transcription factors Pax-4 and Pax-6 are known to be key regulators of pancreatic cell differentiation and development. We report on the cloning of a mouse Pax-4 gene, which contains 10 exons, spanning a 4. 7-kbp region. The gene-targeting experiments revealed that Pax-4 and Pax-6 cannot substitute for each other in tissue with overlapping expression of both genes. We identified DNA-binding specificities of Pax-4 paired domain and paired-type homeodomain. Despite the different Pax-4 amino acid residues in positions responsible for Pax-6 paired-domain specificity, the DNA-binding specificities of Pax-4 and Pax-6 are similar. The Pax-4 homeodomain was shown to preferentially dimerize on DNA sequences consisting of an inverted TAAT motif, separated by 4-nucleotide spacing. The Pax-4 transactivation domain was localized within its C-terminal region, which transactivated GAL-based reporter 2.5-fold less than the C-terminal region of Pax-6. We believe that Pax-4 can act as a Pax-6 "repressor," due to the competition for binding sites and lower transactivation potential of Pax-4. CI - Copyright 1999 Academic Press. FAU - Kalousova, A AU - Kalousova A AD - Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Prague, Czech Republic. Anna@biomed.cas.cz FAU - Benes, V AU - Benes V FAU - Paces, J AU - Paces J FAU - Paces, V AU - Paces V FAU - Kozmik, Z AU - Kozmik Z LA - eng SI - GENBANK/AF142321 SI - GENBANK/AF145233 PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Biochem Biophys Res Commun JT - Biochemical and biophysical research communications JID - 0372516 RN - 0 (DNA-Binding Proteins) RN - 0 (Eye Proteins) RN - 0 (Homeodomain Proteins) RN - 0 (PAX4 protein, human) RN - 0 (PAX6 Transcription Factor) RN - 0 (PAX6 protein, human) RN - 0 (Paired Box Transcription Factors) RN - 0 (Pax4 protein, mouse) RN - 0 (Pax6 protein, mouse) RN - 0 (Repressor Proteins) RN - 0 (Transcription Factors) RN - EC 1.13.12.- (Luciferases) SB - IM MH - Amino Acid Sequence MH - Animals MH - Base Sequence MH - Cells, Cultured MH - Cloning, Molecular MH - DNA-Binding Proteins/*physiology MH - Dose-Response Relationship, Drug MH - Exons MH - Eye Proteins MH - Homeodomain Proteins/*physiology MH - Humans MH - Introns MH - Kidney/metabolism MH - Luciferases/metabolism MH - Mice MH - Molecular Sequence Data MH - PAX6 Transcription Factor MH - Paired Box Transcription Factors MH - Repressor Proteins MH - Sequence Homology, Amino Acid MH - Transcription Factors/*physiology MH - Transcriptional Activation/*physiology EDAT- 1999/06/12 00:00 MHDA- 1999/06/12 00:01 CRDT- 1999/06/12 00:00 PHST- 1999/06/12 00:00 [pubmed] PHST- 1999/06/12 00:01 [medline] PHST- 1999/06/12 00:00 [entrez] AID - 10.1006/bbrc.1999.0809 [doi] AID - S0006291X99908094 [pii] PST - ppublish SO - Biochem Biophys Res Commun. 1999 Jun 16;259(3):510-8. doi: 10.1006/bbrc.1999.0809.