The Interacting Domains of PREP1 and p160 are Endowed with a Remarkable Structural Stability.

Abstract:

:PREP1/p160 is a protein complex with relevant physiopathological roles in vivo. p160 regulates PREP1 transcriptional activity by preventing the formation of other PREP1-containing complexes, whereas PREP1 regulates p160 activity by increasing its stability. This induces the repression of the insulin-regulated glucose transporter GLUT4 dampening insulin sensitivity. In spite of the considerable amount of functional studies performed on the PREP1/p160 complex in vivo, a biochemical and structural characterization of this complex has not been so far undertaken, given the poor stability of the recombinant full-length proteins. Here, we report the design and preparation of PREP1 and p160 domains together with preliminary structural and binding studies. PREP1, residues 45-155, and p160, residues 20-160, have been expressed and purified as folded, monomeric domains. The two domains show both all-alpha secondary structures, as demonstrated by CD studies and are endowed with unusually high thermal stabilities. We have also estimated for the first time the PREP1-p160 interaction strength finding that the two recombinant domains interact with a KD ranging between about 0.3 and 1 μM. Altogether, data suggest that the selected PREP1 and p160 domains are structurally independent and that their structure is underlined by high stability and a prevailing alpha-helical organization.

journal_name

Mol Biotechnol

journal_title

Molecular biotechnology

authors

Lorenzo V,Mascanzoni F,Vitagliano L,Ruvo M,Doti N

doi

10.1007/s12033-016-9932-3

subject

Has Abstract

pub_date

2016-05-01 00:00:00

pages

328-39

issue

5

eissn

1073-6085

issn

1559-0305

pii

10.1007/s12033-016-9932-3

journal_volume

58

pub_type

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