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Evolutionary analysis of the TPP-dependent enzyme family

Costelloe, S.J.; Ward, J.M.; Dalby, P.A.; (2008) Evolutionary analysis of the TPP-dependent enzyme family. Journal of Molecular Evolution , 66 (1) pp. 36-49. 10.1007/s00239-007-9056-2. Green open access

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The evolutionary relationships of the thiamine pyrophosphate (TPP)-dependent family of enzymes was investigated by generation of a neighbor joining phylogenetic tree using sequences from the conserved pyrophosphate (PP) and pyrimidine (Pyr) binding domains of 17 TPP-dependent enzymes. This represents the most comprehensive analysis of TPP-dependent enzyme evolution to date. The phylogeny was shown to be robust by comparison with maximum likelihood trees generated for each individual enzyme and also broadly confirms the evolutionary history proposed recently from structural comparisons alone (Duggleby 2006). The phylogeny is most parsimonious with the TPP enzymes having arisen from a homotetramer which subsequently diverged into an α2β2 heterotetramer. The relationship between the PP- and Pyr-domains and the recruitment of additional protein domains was examined using the transketolase C-terminal (TKC)-domain as an example. This domain has been recruited by several members of the family and yet forms no part of the active site and has unknown function. Removal of the TKC-domain was found to increase activity toward β-hydroxypyruvate and glycolaldehyde. Further truncations of the Pyr-domain yielded several variants with retained activity. This suggests that the influence of TKC-domain recruitment on the evolution of the mechanism and specificity of transketolase (TK) has been minor, and that the smallest functioning unit of TK comprises the PP- and Pyr-domains, whose evolutionary histories extend to all TPP-dependent enzymes.

Type: Article
Title: Evolutionary analysis of the TPP-dependent enzyme family
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s00239-007-9056-2
Publisher version: http://dx.doi.org/10.1007/s00239-007-9056-2
Language: English
Additional information: The original publication is available at www.springerlink.com
Keywords: Thiamine pyrophosphate, transketolase, domains, phylogeny, mutagenesis, truncation
UCL classification: UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Structural and Molecular Biology
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Biochemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/16205
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