Iterative database searches demonstrate that glycoside hydrolase families 27, 31, 36 and 66 share a common evolutionary origin with family 13.
Classification of glycoside hydrolases (GHs) into families, along with the structure-based grouping together of families into clans, improve our understanding of the evolution of the large natural variety of these enzymes, help rationalise experimental data and guide further studies. Here we identify triose phosphate isomerase (TIM) barrels in GH families 27, 31, 36 and 66. We further show that iterated sequence database searches provide evidence for their sharing a common evolutionary origin with GH family 13. The catalytic, nucleophilic residue common to all these families is thereby determined and candidate catalytic proton donors identified within each family.
Rigden
Daniel J
DJ
Embrapa Genetic Resources and Biotechnology, Cenargen/Embrapa, S.A.I.N. Parque Rural, Final W5, Asa Norte, 70770-900, Brasília, Brazil. daniel@cenargen.embrapa.br
D001224:Aspartic Acid / Q000737:chemistry / Q000235:genetics*; D020134:Catalytic Domain; D030541:Databases, Genetic; D019143:Evolution, Molecular; D006026:Glycoside Hydrolases / Q000737:chemistry / Q000145:classification / Q000235:genetics*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D014305:Triose-Phosphate Isomerase / Q000737:chemistry / Q000235:genetics*
D001224:Aspartic Acid; D006026:Glycoside Hydrolases; D014305:Triose-Phosphate Isomerase