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2017 ; 7
(ä): 44388
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Small Molecule-Induced Domain Swapping as a Mechanism for Controlling Protein
Function and Assembly
#MMPMID28287617
Karchin JM
; Ha JH
; Namitz KE
; Cosgrove MS
; Loh SN
Sci Rep
2017[Mar]; 7
(ä): 44388
PMID28287617
show ga
Domain swapping is the process by which identical proteins exchange reciprocal
segments to generate dimers. Here we introduce induced domain swapping (INDOS) as
a mechanism for regulating protein function. INDOS employs a modular design
consisting of the fusion of two proteins: a recognition protein that binds a
triggering molecule, and a target protein that undergoes a domain swap in
response to binding of the triggering ligand. The recognition protein (FK506
binding protein) is inserted into functionally-inactivated point mutants of two
target proteins (staphylococcal nuclease and ribose binding protein). Binding of
FK506 to the FKBP domain causes the target domain to first unfold, then refold
via domain swap. The inactivating mutations become 'swapped out' in the dimer,
increasing nuclease and ribose binding activities by 100-fold and 15-fold,
respectively, restoring them to near wild-type values. INDOS is intended to
convert an arbitrary protein into a functional switch, and is the first example
of rational design in which a small molecule is used to trigger protein domain
swapping and subsequent activation of biological function.