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Title 

Structural disorder and local order of hNopp140

Authors 

A TantosK SzrnkaB SzaboM BokorP KamasaP MatusA BekesiK TompaKyou Hoon HanP Tompa

Publisher 

Elsevier

Issue Date 

2013

Citation 

Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics, vol. 1834, no. 1, pp. 342-350

Keywords 

Human nucleolar phosphoprotein p140Intrinsically disordered proteinLocal structurePre-structured motif

Abstract 

Human nucleolar phosphoprotein p140 (hNopp 140) is a highly phosphorylated protein inhibitor of casein kinase 2 (CK2). As in the case of many kinase-inhibitor systems, the inhibitor has been described to belong to the family of intrinsically disordered proteins (IDPs), which often utilize transient structural elements to bind their cognate enzyme. Here we investigated the structural status of this protein both to provide distinct lines of evidence for its disorder and to point out its transient structure potentially involved in interactions and also its tendency to aggregate. Structural disorder of hNopp140 is apparent by its anomalous electrophoretic mobility, protease sensitivity, heat stability, hydrodynamic behavior on size-exclusion chromatography, 1H NMR spectrum and differential scanning calorimetry scan. hNopp140 has a significant tendency to aggregate and the change of its circular dichroism spectrum in the presence of 0-80% TFE suggests a tendency to form local helical structures. Wide-line NMR measurements suggest the overall disordered character of the protein. In all, our data suggest that this protein falls into the pre-molten globule state of IDPs, with a significant tendency to become ordered in the presence of its partner as demonstrated in the presence of transcription factor IIB (TFIIB).

ISSN 

1570-9639

Link 

http://dx.doi.org/10.1016/j.bbapap.2012.08.005

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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