Characterization of a regulatory region in the N-terminus of rabbit Kv1.3
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AbstractThe N-terminus of rabbit Kv1.3 contains a signal sequence which regulates expression of Kv1.3 proteins in the plasma membrane. Removal of an N-terminal region (aa3-39) produced an increase in expressed K+ current. Progressive deletion at the N-terminus demonstrated that the shortest deletion required for the elevation of K current is D6-34. Since the functional signal sequence must include both ends of the peptide segment aa6-34 where charged residues are densely distributed, it is conceivable that this N-terminal signal sequence is related to charge or its associated hydrophilicity. Removal of two charged residues (31R, 33E) through amino acid substitution which converts deletion construct D3-27 to D3-27* effectively raises the amplitude of expressed current, further indicating the importance of charged residues. With the use of a mutated dynamin and a soluble N-terminal peptide, we also revealed that the N-terminal signal sequence may not act through the endocytotic pathway. (C) 1998 Academic Press.
All Author(s) ListYao XQ, Huang Y, Kwan HY, Chan P, Desir G
Journal nameBiochemical and Biophysical Research Communications
Volume Number249
Issue Number2
Pages492 - 498
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesBiochemistry & Molecular Biology; BIOCHEMISTRY & MOLECULAR BIOLOGY; Biophysics; BIOPHYSICS

Last updated on 2020-29-05 at 02:42