Allosteric rescue of catalytically impaired ATP phosphoribosyltransferase variants links protein dynamics to active-site electrostatic preorganisation.
Allosteric rescue of catalytically impaired ATP phosphoribosyltransferase variants links protein dynamics to active-site electrostatic preorganisation.
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DOI:
10.1038/s41467-022-34960-9
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发表时间:
2022-12-09
影响因子:
16.6
通讯作者:
da Silva, Rafael G.
中科院分区:
文献类型:
--
作者:
Fisher, Gemma;Corbella, Marina;Alphey, Magnus S.;Nicholson, John;Read, Benjamin J.;Kamerlin, Shina C. L.;da Silva, Rafael G.
ATP phosphoribosyltransferase catalyses the first step of histidine biosynthesis and is controlled via a complex allosteric mechanism where the regulatory protein HisZ enhances catalysis by the catalytic protein HisGS while mediating allosteric inhibition by histidine. Activation by HisZ was proposed to position HisGS Arg56 to stabilise departure of the pyrophosphate leaving group. Here we report active-site mutants of HisGS with impaired reaction chemistry which can be allosterically restored by HisZ despite the HisZ:HisGS interface lying ~20 Å away from the active site. MD simulations indicate HisZ binding constrains the dynamics of HisGS to favour a preorganised active site where both Arg56 and Arg32 are poised to stabilise leaving-group departure in WT-HisGS. In the Arg56Ala-HisGS mutant, HisZ modulates Arg32 dynamics so that it can partially compensate for the absence of Arg56. These results illustrate how remote protein-protein interactions translate into catalytic resilience by restoring damaged electrostatic preorganisation at the active site. ATPPRT is a multi-protein allosteric enzyme where the regulatory protein HisZ enhances catalysis by HisGs. Here, the authors report catalytically impaired active site mutants of HisGs that are allosterically rescued by HisZ despite the HisZ:HisGs interface lying ~20 Å away from the active site.
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影响因子:
4.1
作者:
Kulis-Horn, Robert K.;Persicke, Marcus;Kalinowski, Joern
通讯作者:
Kalinowski, Joern
DOI:
10.1073/pnas.1717621115
发表时间:
2018-03-20
影响因子:
11.1
作者:
Fan, Yifei;Cross, Penelope J.;Parker, Emily J.
通讯作者:
Parker, Emily J.
影响因子:
4.8
作者:
Champagne, KS;Sissler, M;Francklyn, SS
通讯作者:
Francklyn, SS
DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
作者:
Emsley, P;Cowtan, K
通讯作者:
Cowtan, K
影响因子:
4.4
作者:
JORGENSEN, WL;CHANDRASEKHAR, J;KLEIN, ML
通讯作者:
KLEIN, ML