Direct contacts between conserved motifs of different subunits provide major contribution to active site organization in human and mycobacterial dUTPases.
Direct contacts between conserved motifs of different subunits provide major contribution to active site organization in human and mycobacterial dUTPases.
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DOI:
10.1016/j.febslet.2010.05.018
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发表时间:
2010-07-16
期刊:
影响因子:
3.5
通讯作者:
Vértessy BG
中科院分区:
文献类型:
--
作者:
Takács E;Nagy G;Leveles I;Harmat V;Lopata A;Tóth J;Vértessy BG
dUTPases are essential for genome integrity. Recent results allowed characterization of the role of conserved residues. Here we analyzed the Asp/Asn mutation within conserved Motif I of human and mycobacterial dUTPases, wherein the Asp residue was previously implicated in Mg2+-coordination. Our results on transient/steady-state kinetics, ligand-binding and a 1.80 Å-resolution structure of the mutant mycobacterial enzyme, in comparison with wild type and C-terminally truncated structures, argue that this residue has a major role in providing intra- and intersubunit contacts, but is not essential for Mg2+ accommodation. We conclude that in addition to the role of conserved motifs in substrate accommodation, direct subunit interaction between protein atoms of active site residues from different conserved motifs are crucial for enzyme function.
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影响因子:
18.3
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Vertessy, Beata G.;Toth, Judit
通讯作者:
Toth, Judit
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Kovári, J;Barabás, O;Vértessy, BG
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10.1107/s0907444904019158
发表时间:
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