Induced Folding Under Membrane Mimetic and Acidic Conditions Implies Undiscovered Biological Roles of Prokaryotic Ubiquitin-Like Protein Pup

Author(s): Kaiqin Ye, Xiaoming Tu, Xuecheng Zhang, Qiang Shang, Shanhui Liao, Jigang Yu, Jiahai Zhang.

Journal Name: Protein & Peptide Letters

Volume 23 , Issue 8 , 2016

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Abstract:

Ubiquitin-like proteins play important roles in diverse biological processes. In Mycobacterium tuberculosis, Pup (prokaryotic ubiquitin-like protein), a functional homologue of eukaryotic ubiquitin, interacts with the proteasome ATPase subunit Mpa to recognize and unfold substrates, and then translocate them into the proteasome core for degradation. Previous studies revealed that, Pup, an intrinsically disordered protein (IDP), adopts a helical structure upon binding to the N-terminal coiled-coil domain of Mpa, at its disordered C-terminal region. In the present study, using circular dichroism (CD), surface plasmon resonance (SPR) and nuclear magnetic resonance (NMR), we show that membrane mimetic and acidic conditions also induce Pup to adopt helical conformations. Moreover, at low pH, Pup, via both of its N- and C-terminal regions, binds to Mpa on sites from the N-terminal region in addition to the C-terminal region of the coiled-coil domain. Our results imply Pup may play undiscovered roles in some biological processes e.g. those involve in membrane.

Keywords: Intrinsically disordered protein, induced folding, Mpa, membrane, nuclear magnetic resonance, prokaryotic ubiquitin-like protein.

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Article Details

VOLUME: 23
ISSUE: 8
Year: 2016
Page: [756 - 762]
Pages: 7
DOI: 10.2174/0929866523666160530185322
Price: $58

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