Abstract:
:PLD's (Phospholipases D) are ubiquitously expressed proteins involved in many transphosphatidylation reactions. They have a bi-lobed structure composed by two similar domains which at their interface reconstitute the catalytic site through the association of the two conserved HxKx(4)Dx(6)GSxN motifs. PLD1 interacts with the small phosphoprotein PED-PEA15 by an unknown mechanism that, by enhancing PLD1 stability, apparently increases its enzymatic activity; the minimum interacting region of PLD1 was previously identified as spanning residues 712-1074 (D4 region). Since the D4/PED-PEA15 interaction has been claimed to be one of the multiple molecular events that can trigger type 2 diabetes, we purified the two recombinant proteins to study in vitro this binding by both ELISA and SPR techniques. Whilst PED-PEA15 was easily expressed and purified, expression of recombinant D4 was more problematic and only the fusion protein with Thioredoxin A and a six Histidine Tag (Trx-His(6)-D4) demonstrated sufficient stability for further characterization. We have found that Trx-His(6)-D4 is present as two different oligomeric forms, though only the monomeric variant is able to interact with PED-PEA15. All these findings may have important implications for both the mechanisms of phospholipase activity and PED-PEA15 regulative functions.
journal_name
Protein Expr Purifjournal_title
Protein expression and purificationauthors
Viparelli F,Doti N,Sandomenico A,Marasco D,Dathan NA,Miele C,Beguinot F,Monti SM,Ruvo Mdoi
10.1016/j.pep.2008.02.012subject
Has Abstractpub_date
2008-06-01 00:00:00pages
302-8issue
2eissn
1046-5928issn
1096-0279pii
S1046-5928(08)00057-0journal_volume
59pub_type
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