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• W2042026265 endingPage "686" @default.
• W2042026265 startingPage "677" @default.
• W2042026265 abstract "The II–III loop of the dihydropyridine receptor (DHPR) α1s subunit is a modulator of the ryanodine receptor (RyR1) Ca2+ release channel in vitro and is essential for skeletal muscle contraction in vivo. Despite its importance, the structure of this loop has not been reported. We have investigated its structure using a suite of NMR techniques which revealed that the DHPR II–III loop is an intrinsically unstructured protein (IUP) and as such belongs to a burgeoning structural class of functionally important proteins. The loop does not possess a stable tertiary fold: it is highly flexible, with a strong N-terminal helix followed by nascent helical/turn elements and unstructured segments. Its residual structure is loosely globular with the N and C termini in close proximity. The unstructured nature of the II–III loop may allow it to easily modify its interaction with RyR1 following a surface action potential and thus initiate rapid Ca2+ release and contraction. The in vitro binding partner for the II–III was investigated. The II–III loop interacts with the second of three structurally distinct SPRY domains in RyR1, whose function is unknown. This interaction occurs through two preformed N-terminal α-helical regions and a C-terminal hydrophobic element. The A peptide corresponding to the helical N-terminal region is a common probe of RyR function and binds to the same SPRY domain as the full II–III loop. Thus the second SPRY domain is an in vitro binding site for the II–III loop. The possible in vivo role of this region is discussed." @default.
• W2042026265 created "2016-06-24" @default.
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• W2042026265 date "2009-03-01" @default.
• W2042026265 modified "2023-10-02" @default.
• W2042026265 title "A dihydropyridine receptor α1s loop region critical for skeletal muscle contraction is intrinsically unstructured and binds to a SPRY domain of the type 1 ryanodine receptor" @default.
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• W2042026265 doi "https://doi.org/10.1016/j.biocel.2008.08.004" @default.
• W2042026265 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18761102" @default.
• W2042026265 hasPublicationYear "2009" @default.
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