Structurally analogous proteins do exist!
Krishna
S Sri
SS
Grishin
Nick V
NV
D000255:Adenosine Triphosphate / Q000737:chemistry / Q000378:metabolism*; D002352:Carrier Proteins / Q000737:chemistry / Q000378:metabolism*; D008958:Models, Molecular; D011485:Protein Binding; D017510:Protein Folding; D017433:Protein Structure, Secondary; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D040681:Structural Homology, Protein
D002352:Carrier Proteins; D011993:Recombinant Fusion Proteins; D000255:Adenosine Triphosphate