1wbp: Difference between revisions
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==Overview== | ==Overview== | ||
The arginine-serine (RS)-rich domain of the SR protein ASF/SF2 is, phosphorylated by SR protein kinases (SRPKs) and Clk/Sty kinases. However, the mode of phosphorylation by these kinases and their coordination in the, biological regulation of ASF/SF2 is unknown. Here, we report the crystal, structure of an active fragment of human SRPK1 bound to a peptide derived, from an SR protein. This structure led us to identify a docking motif in, ASF/SF2. We find that this docking motif restricts phosphorylation of, ASF/SF2 by SRPK1 to the N-terminal part of the RS domain - a property, essential for its assembly into nuclear speckles. We further show that, Clk/Sty causes release of ASF/SF2 from speckles by phosphorylating the, C-terminal part of its RS domain. These results suggest that the | The arginine-serine (RS)-rich domain of the SR protein ASF/SF2 is, phosphorylated by SR protein kinases (SRPKs) and Clk/Sty kinases. However, the mode of phosphorylation by these kinases and their coordination in the, biological regulation of ASF/SF2 is unknown. Here, we report the crystal, structure of an active fragment of human SRPK1 bound to a peptide derived, from an SR protein. This structure led us to identify a docking motif in, ASF/SF2. We find that this docking motif restricts phosphorylation of, ASF/SF2 by SRPK1 to the N-terminal part of the RS domain - a property, essential for its assembly into nuclear speckles. We further show that, Clk/Sty causes release of ASF/SF2 from speckles by phosphorylating the, C-terminal part of its RS domain. These results suggest that the docking, motif of ASF/SF2 is a key regulatory element for sequential, phosphorylation by SRPK1 and Clk/Sty and, thus, is essential for its, subcellular localization. | ||
==About this Structure== | ==About this Structure== | ||
1WBP is a | 1WBP is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with ACT and ADP as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Transferred_entry:_2.7.11.1 Transferred entry: 2.7.11.1], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.37 2.7.1.37] Structure known Active Site: AC1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1WBP OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 13:49:23 2007'' | ||
