MACiE Entries homologous to 1m54

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

MACiE Entry: 1pwh
L-serine ammonia-lyase
Species: Rattus norvegicus
Catalytic Residues:  Lys41A  Ala222A  Cys303A  
CSA Entry: 1m54
cystathionine beta-synthase
Species: Homo sapiens
Catalytic Residues:  Lys119A  

Whilst these entries are considered homologous, they differ at the sub-class level of the EC classification.
Their mechanisms may not be the same.