Abstract:
:The TRPS1 gene codes for a 1281 amino acids nuclear transcription factor with an unusual combination of different types of zinc finger motifs, including GATA-type DNA-binding and IKAROS-like zinc fingers. TRPS1 is a repressor of GATA-regulated genes and implicated in the human tricho-rhino-phalangeal syndromes. We found that two distinct regions of TRPS1 can physically interact with the dynein light chain 8 protein, LC8a, that are at least 458 amino acids apart from each other. Region A covers 89 amino acids (635-723), spanning three potential C(2)H(2) zinc finger structures, and region B covers the 100 most C-terminal amino acids (1182-1281) containing the IKAROS-like motif. LC8a is known to interact with more than 10 different molecules, both proteins and nucleic acids. In most cases, LC8a was identified as a transport molecule in the cytoplasm. Interestingly, we found that LC8a co-localizes with TRPS1 in dot-like structures in the cell nucleus. In an electrophoretic mobility shift assay we could show that the interaction of LC8a and TRPS1 lowers the binding of TRPS1 to the GATA consensus sequence. In addition, GATA-regulated reporter gene assay indicated that LC8a is able to suppress the transcriptional repression activity of TRPS1.
journal_name
Hum Mol Genetjournal_title
Human molecular geneticsauthors
Kaiser FJ,Tavassoli K,Van den Bemd GJ,Chang GT,Horsthemke B,Möröy T,Lüdecke HJdoi
10.1093/hmg/ddg145subject
Has Abstractpub_date
2003-06-01 00:00:00pages
1349-58issue
11eissn
0964-6906issn
1460-2083journal_volume
12pub_type
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