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Title: A weak spliceosome-Binding domain of Yju2 functions in the first step and bypasses Prp16 in the second step of Splicing
Authors: Chiang, T.-W. 
Cheng, S.-C.
Issue Date: May-2013
Citation: Chiang, T.-W., Cheng, S.-C. (2013-05). A weak spliceosome-Binding domain of Yju2 functions in the first step and bypasses Prp16 in the second step of Splicing. Molecular and Cellular Biology 33 (9) : 1746-1755. ScholarBank@NUS Repository.
Abstract: Yju2 is an essential splicing factor required for the first catalytic step after the action of Prp2. We dissected the structure of Yju2 and found that the amino (Yju2-N) and carboxyl (Yju2-C) halves of the protein can be separated and reconstituted for Yju2 function both in vivo and in vitro. Yju2-N has a weak affinity for the spliceosome but functions in promoting the first reaction, with the second reaction being severely impeded. The association of Yju2-N with the spliceosome is stabilized by the presence of Yju2-C at both the precatalytic and postcatalytic stages. Strikingly, Yju2-N supported a low level of the second reaction even in the absence of Prp16. Prp16 is known to mediate destabilization of Yju2 and Cwc25 after the first reaction to allow progression of the second reaction. We propose that in the absence of the C domain, Yju2-N is not stably associated with the spliceosome after lariat formation, and thus bypasses the need for Prp16. We also showed, by UV cross-linking, that Yju2 directly contac s U2 snRNA primarily in the helix II region both pre- and postcatalytically and in the branch-binding region only at the precatalytic stage, suggesting a possible role for Yju2 in positioning the branch point during the first reaction. © 2013, American Society for Microbiology.
Source Title: Molecular and Cellular Biology
ISSN: 02707306
DOI: 10.1128/MCB.00035-13
Appears in Collections:Staff Publications

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