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Proc Natl Acad Sci U S A 1995 Mar 28;927:2989-93. doi: 10.1073/pnas.92.7.2989.
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A multimerizing transcription factor of sea urchin embryos capable of looping DNA.

Zeller RW , Griffith JD , Moore JG , Kirchhamer CV , Britten RJ , Davidson EH .

SpGCF1 is a recently cloned sea urchin transcription factor that recognizes target sites in several different sea urchin genes. We find that in gel-shift experiments this factor is able to multimerize. A quantitative simulation of the gel-shift results suggests that SpGCF1 molecules that are bound to DNA target sites may also bind to one another, thus associating several DNA probe molecules. SpGCF1 might therefore be able to loop DNA molecules bearing its target sites at distant locations. We demonstrate this prediction by electron microscopy, and using the well-characterized cis-regulatory domain of the CyIIIa cytoskeletal actin gene, we show that the loop conformations predicted from the known SpGCF1 target site locations are actually formed in vitro. We speculate that the multimerization of this factor in vivo may function to bring distant regions of extended regulatory domains into immediate proximity so that they can interact with one another.

PubMed ID: 7708761
PMC ID: PMC42344
Article link: Proc Natl Acad Sci U S A
Grant support: [+]

Genes referenced: CyIIIa LOC100887844 LOC590297

References [+] :
Akasaka, Genomic organization of a gene encoding the spicule matrix protein SM30 in the sea urchin Strongylocentrotus purpuratus. 1994, Pubmed, Echinobase