Journal
MOLECULAR BIOTECHNOLOGY
Volume 58, Issue 5, Pages 328-339Publisher
HUMANA PRESS INC
DOI: 10.1007/s12033-016-9932-3
Keywords
PREP1; p160; Protein domain design; Protein purification; Circular dichroism spectroscopy; Thermal stability; Protein-protein interaction
Funding
- FIRB MERIT [RBNE08NKH7_003]
- PON Ricerca e Competitivita [PON01_01602, PON01_02342, PON04a2_C SMART HEALTH]
- Rete integrata per le biotecnologie applicate a molecole ad attivita farmacologica-FarmaBioNet
- progetto BERSAGLI- Bersagli, sonde e segnali in terapia diagnostica (Bando per la Realizzazione della Rete delle Biotecnologie Campane, Obiettivo Operativo 2.1 POR Campania)
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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 mu M. 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.
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