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Understanding Pre-Structured Motifs (PreSMos) in Intrinsically Unfolded Proteins

[ Vol. 13 , Issue. 1 ]

Author(s):

Si-Hyung Lee, Do-Hyoung Kim, Joan J. Han, Eun-Ji Cha, Ji-Eun Lim, Ye-Jin Cho, Chewook Lee and Kyou-Hoon Han   Pages 34 - 54 ( 21 )

Abstract:


Intrinsically unfolded proteins (IUPs) do not obey the golden rule of structural biology, 3D structure = function, as they manifest their inherent functions without resorting to three-dimensional structures. Absence of a compact globular topology in these proteins strongly implies that their ligand recognition processes should involve factors other than spatially well-defined binding pockets. Heteronuclear multidimensional (HetMulD) NMR spectroscopy assisted with a stable isotope labeling technology is a powerful tool for quantitatively investigating detailed structural features in IUPs. In particular, it allows us to delineate the presence and locations of pre-structured motifs (PreSMos) on a per-residue basis. PreSMos are the transient local structural elements that presage target-bound conformations and act as specificity determinants for IUP recognition by target proteins. Here, we present a brief chronicle of HetMulD NMR studies on IUPs carried out over the past two decades along with a discussion on the functional significance of PreSMos in IUPs.

Keywords:

PreSMos (Pre-Structured Motifs), IUPs (Intrinsically Unfolded Proteins), NMR, IDR (Intrinsically Disordered Region), Mostly Unstructured (MU), Completely Unstructured (CU), IDPs, NUPs, Polypeptide, amphipathic helix

Affiliation:

Biomedical Translational Research Center, Division of Convergent Biomedical Research, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-ro, Yuseong-gu, Daejeon, 305-806 Korea.



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