[No authors listed]
Molybdoenzymes contain a molybdenum cofactor in their active site to catalyze various redox reactions in all domains of life. To decipher crucial steps during their biogenesis, the TorA molybdoenzyme of Escherichia coli had played a major role to understand molybdoenzyme maturation process driven by specific chaperones. TorD, the specific chaperone of TorA, is also involved in TorA protection. Here, we show that immature TorA (apoTorA) is degraded in vivo and in vitro by the Lon protease. Lon interacts with apoTorA but not with holoTorA. Lon and TorD compete for apoTorA binding but TorD binding protects apoTorA against degradation. Lon is the first protease shown to eliminate an immature or misfolded molybdoenzyme probably by targeting its inactive catalytic site.
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