Structural organization and cellular localization of tuftelin-interacting protein 11 (TFIP11) |
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Authors: | X Wen Y-P Lei Y L Zhou C T Okamoto M L Snead M L Paine |
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Institution: | (1) Center for Craniofacial Molecular Biology, University of Southern California School of Dentistry, 2250 Alcazar Street, CSA room 103, Los Angeles, California 90033-1004, USA;(2) Department of Pharmaceutical Sciences, University of Southern California School of Pharmacy, Los Angeles, California 90089-9121, USA |
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Abstract: | Tuftelin-interacting protein (TFIP11) was first identified in a yeast two-hybrid screening as a protein interacting with tuftelin. The ubiquitous expression of TFIP11 suggested that it might have other functions in non-dental tissues. TFIP11 contains a G-patch, a protein domain believed to be involved in RNA binding. Using a green fluorescence protein tag, TFIP11 was found to locate in a novel subnuclear structure that we refer to as the TFIP body. An in vivo splicing assay demonstrated that TFIP11 is a novel splicing factor. TFIP11 diffuses from the TFIP body following RNase A treatment, suggesting that the retention of TFIP11 is RNA dependent. RNA polymerase II inhibitor (-amanitin and actinomycin D) treatment causes enlargement in size and decrease in number of TFIP bodies, suggesting that TFIP bodies perform a storage function rather than an active splicing function. The TFIP body may therefore represent a new subnuclear storage compartment for splicing components.Received 8 December 2004; received after revision 27 January 2005; accepted 8 March 2004The nucleotide sequence for the cDNA to mouse TFIP11 (previously known as TIP39 and TIP39kDa) has been submitted to Gen- BankTM/ EBI Data Bank with accession numbers AF290474 and NM_018783. The accession number for the human TFIP11 homologueis NM_012143. |
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Keywords: | Alternative splicing G-patch green-fluorescence protein RNA splicing spliceosome TFIP11 TFIP body TIP39 TIP39kDa tuftelin-interacting protein |
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