A spectroscopic analysis of the interaction between the human regulatory proteins RACK1 and Ki-1/57 |
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Authors: | Nery Flávia C Bressan Gustavo C Alborghetti Marcos R Passos Dario O Kuniyoshi Taís M Ramos Carlos H I Oyama Sergio Kobarg Jörg |
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Affiliation: | Centro de Biologia Molecular Estrutural, Laboratório Nacional de Luz Síncrotron, Rua Giuseppe Máximo Scolfaro 10.000, C.P. 6192, 13084-971 Campinas SP, Brazil. |
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Abstract: | Ki-1/57 is a 57-kDa cytoplasmic and nuclear protein associated with protein kinase activity and is hyper-phosphorylated on Ser/Thr residues upon cellular activation. In previous studies we identified the receptor of activated kinase-1 (RACK1), a signaling adaptor protein that binds activated PKC, as a protein that interacts with Ki-1/57. Here we demonstrate that the far-UV circular dichroism spectrum of the WD repeat-containing RACK1 protein shows an unusual positive ellipticity at 229 nm, which in other proteins of the WD family has been attributed to surface tryptophans that are quenchable by N-bromosuccinimide (NBS). As well as NBS, in vitro binding of 6xHis-Ki-1/57(122-413) and 6xHis-Ki-1/57(264-413) can also quench the positive ellipticity of the RACK1 spectrum. We generated a model of RACK1 by homology modeling using a G protein beta subunit as template. Our model suggests the family-typical seven-bladed beta-propeller, with an aromatic cluster around the central tunnel that contains four Trp residues (17, 83, 150, 170), which are likely involved in the interaction with Ki-1/57. |
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