Thermal and chemical unfolding pathways of PaSdsA1 sulfatase, a homo-dimer with topologically interlinked chains.
Understanding the mechanisms as to how interlinked proteins entangle and fold is a challenge. PaSdsA1 sulfatase is a homo-dimer containing two zinc atoms per monomer. The monomer chains are interlinked in a dimerization domain. To study the unfolding pathways denaturation experiments were performed. In the native protein three forms coexist in chemical equilibrium, each with a different number of zinc atoms. In the chemical unfolding of the holo-dimers the entanglement of the chains is preserved and acts as a 'folding seed', allowing the unfolding process to be reversible. Thermal irreversible unfolding of the holo-dimers favours dissociation, producing monomers that are SDS-stabilized. The thermal unfolding of these monomers is reversible. However, it is not possible to form dimers from unfolded monomers.
['Aguirre|César|C|', 'Goto|Yuji|Y|', 'Costas|Miguel|M|']
D002152:Calorimetry, Differential Scanning D002942:Circular Dichroism D019281:Dimerization D008958:Models, Molecular D011487:Protein Conformation D058767:Protein Unfolding D012967:Sodium Dodecyl Sulfate D013429:Sulfatases D013696:Temperature
unfolding pathways PaSdsA1 sulfatase interlinked chains entangled chains stabilization with SDS