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Engineering a monobody specific to monomeric Cu/Zn-superoxide dismutase associated with amyotrophic lateral sclerosis.
Protein Science 2024 April
Misfolding of mutant Cu/Zn-superoxide dismutase (SOD1) has been implicated in familial form of amyotrophic lateral sclerosis (ALS). A natively folded SOD1 forms a tight homodimer, and the dimer dissociation has been proposed to trigger the oligomerization/aggregation of SOD1. Besides increasing demand for probes allowing the detection of monomerized forms of SOD1 in various applications, the development of probes has been limited to conventional antibodies. Here, we have developed Mb(S4) monobody, a small synthetic binding protein based on the fibronectin type III scaffold, that recognizes a monomeric but not dimeric form of SOD1 by performing combinatorial library selections using phage and yeast-surface display methods. Although Mb(S4) was characterized by its excellent selectivity to the monomeric conformation of SOD1, the monomeric SOD1/Mb(S4) complex was not so stable (apparent Kd ~ μM) as to be detected in conventional pull-down experiments. Instead, the complex of Mb(S4) with monomeric but not dimeric SOD1 was successfully trapped by proximity-enabled chemical crosslinking even when reacted in the cell lysates. We thus anticipate that Mb(S4) binding followed by chemical crosslinking would be a useful strategy for in vitro and also ex vivo detection of the monomeric SOD1 proteins.
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