Binding-induced Folding of Prokaryotic Ubiquitin-like Protein on the Mycobacterium Proteasomal ATPase Targets Substrates for Degradation

Journal Article · Sat Dec 31 04:00:00 EST 2011 · Nature Structural and Molecular Biology

OSTI ID:1041962

Wang, T; Darwin, K Heran; Li, H

Mycobacterium tuberculosis uses a proteasome system that is analogous to the eukaryotic ubiquitin-proteasome pathway and is required for pathogenesis. However, the bacterial analog of ubiquitin, prokaryotic ubiquitin-like protein (Pup), is an intrinsically disordered protein that bears little sequence or structural resemblance to the highly structured ubiquitin. Thus, it was unknown how pupylated proteins were recruited to the proteasome. Here, we show that the Mycobacterium proteasomal ATPase (Mpa) has three pairs of tentacle-like coiled coils that recognize Pup. Mpa bound unstructured Pup through hydrophobic interactions and a network of hydrogen bonds, leading to the formation of an {alpha}-helix in Pup. Our work describes a binding-induced folding recognition mechanism in the Pup-proteasome system that differs mechanistically from substrate recognition in the ubiquitin-proteasome system. This key difference between the prokaryotic and eukaryotic systems could be exploited for the development of a small molecule-based treatment for tuberculosis.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1041962
• Report Number(s): BNL--97640-2012-JA
• Journal Information: Nature Structural and Molecular Biology, Journal Name: Nature Structural and Molecular Biology Journal Issue: 11 Vol. 17; ISSN 1545-9993
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
HYDROGEN
MYCOBACTERIUM
MYCOBACTERIUM TUBERCULOSIS
PATHOGENESIS
PROTEINS
SUBSTRATES
TARGETS
TUBERCULOSIS