Variable primary coordination environments of Cd(ɪɪ) binding to three helix bundles provide a pathway for rapid metal exchange
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Variable primary coordination environments of Cd(ɪɪ) binding to three helix bundles provide a pathway for rapid metal exchange. / Tebo, Alison G.; Hemmingsen, Lars Bo Stegeager; Pecoraro, Vincent L.
I: Metallomics, Bind 7, Nr. 12, 2015, s. 1555-1561.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Variable primary coordination environments of Cd(ɪɪ) binding to three helix bundles provide a pathway for rapid metal exchange
AU - Tebo, Alison G.
AU - Hemmingsen, Lars Bo Stegeager
AU - Pecoraro, Vincent L.
PY - 2015
Y1 - 2015
N2 - Members of the ArsR/SmtB family of transcriptional repressors, such as CadC, regulate the intracellular levels of heavy metals like Cd(ii), Hg(ii), and Pb(ii). These metal sensing proteins bind their target metals with high specificity and affinity, however, a lack of structural information about these proteins makes defining the coordination sphere of the target metal difficult. Lingering questions as to the identity of Cd(ii) coordination in CadC are addressed via protein design techniques. Two designed peptides with tetrathiolate metal binding sites were prepared and characterized, revealing fast exchange between CdS3O and CdS4 coordination spheres. Correlation of (111m)Cd PAC spectroscopy and (113)Cd NMR spectroscopy suggests that Cd(ii) coordinated to CadC is in fast exchange between CdS3O and CdS4 forms, which may provide a mechanism for rapid sensing of heavy metal contaminants by this regulatory protein.
AB - Members of the ArsR/SmtB family of transcriptional repressors, such as CadC, regulate the intracellular levels of heavy metals like Cd(ii), Hg(ii), and Pb(ii). These metal sensing proteins bind their target metals with high specificity and affinity, however, a lack of structural information about these proteins makes defining the coordination sphere of the target metal difficult. Lingering questions as to the identity of Cd(ii) coordination in CadC are addressed via protein design techniques. Two designed peptides with tetrathiolate metal binding sites were prepared and characterized, revealing fast exchange between CdS3O and CdS4 coordination spheres. Correlation of (111m)Cd PAC spectroscopy and (113)Cd NMR spectroscopy suggests that Cd(ii) coordinated to CadC is in fast exchange between CdS3O and CdS4 forms, which may provide a mechanism for rapid sensing of heavy metal contaminants by this regulatory protein.
U2 - 10.1039/c5mt00228a
DO - 10.1039/c5mt00228a
M3 - Journal article
C2 - 26503746
VL - 7
SP - 1555
EP - 1561
JO - Metallomics
JF - Metallomics
SN - 1756-5901
IS - 12
ER -
ID: 147928633