MACiE Entries homologous to 1g4p

MACiE does not contain the PDB code you entered, but MACiE contains the following PDB codes that are homologous to it:

MACiE Entry: 1h1z
ribulose-phosphate 3-epimerase
Species: Oryza sativa
Catalytic Residues:  Ser11A  Asp38A  Asp178A  
CSA Entry: 1g4p
thiamine-phosphate diphosphorylase
Species: Bacillus subtilis
Catalytic Residues:  Ala1130B  

Whilst these entries are considered homologous, they differ at the Class level of the EC Classification.
The mechanisms are unlikely to be the same.