Detailed structural characterization of unbound protein phosphatase 1 inhibitors.

Abstract:

:Protein phosphatase 1 (PP1) is an essential and ubiquitous serine/threonine protein phosphatase that is regulated by more than 100 known inhibitor and targeting proteins. It is currently unclear how protein inhibitors distinctly and specifically regulate PP1 to enable rapid responses to cellular alterations. We demonstrate that two PP1 inhibitors, I-2 and DARPP-32, belong to the class of intrinsically unstructured proteins (IUPs). We show that both inhibitors have distinct preferences for transient local and long-range structure. These preferences are likely their structural signature for their interaction with PP1. Furthermore, we show that upon phosphorylation of Thr(34) in DARPP-32, which turns DARPP-32 into a potent inhibitor of PP1, neither local nor long-range structure of DARPP-32 is altered. Therefore, our data suggest a role for these transient three-dimensional topologies in binding mechanisms that enable extensive contacts with PP1's invariant surfaces. Together, these interactions enable potent and selective inhibition of PP1.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Dancheck B,Nairn AC,Peti W

doi

10.1021/bi801308y

subject

Has Abstract

pub_date

2008-11-25 00:00:00

pages

12346-56

issue

47

eissn

0006-2960

issn

1520-4995

journal_volume

47

pub_type

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