Structural and energetic determinants of apo calmodulin binding to the IQ motif of the Na(V)1.2 voltage-dependent sodium channel.
Structural and energetic determinants of apo calmodulin binding to the IQ motif of the Na(V)1.2 voltage-dependent sodium channel.
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DOI:
10.1016/j.str.2011.02.009
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发表时间:
2011-05-11
期刊:
影响因子:
5.7
通讯作者:
Shea, Madeline A.
中科院分区:
文献类型:
--
作者:
Feldkamp, Michael D.;Yu, Liping;Shea, Madeline A.
The neuronal voltage-dependent sodium channel (Nav1.2), essential for generation and propagation of action potentials, is regulated by calmodulin (CaM) binding to the IQ motif in its α-subunit. A peptide (Nav1.2IQp, KRKQEEVSAIVIQRAYRRYLLKQKVKK) representing the IQ motif had higher affinity for apo CaM than (Ca2+)4-CaM. Association was mediated solely by the C-domain of CaM. A solution structure (2KXW.pdb) of apo 13C,15N-CaM C-domain bound to Nav1.2IQp was determined with NMR. The region of Nav1.2IQp bound to CaM was helical; R1902, an Nav1.2 residue implicated in familial autism, did not contact CaM. The apo C-domain of CaM in this complex shares features of the same domain bound to myosin V IQ motifs (2IX7) and bound to an SK channel peptide (1G4Y) that does not contain an IQ motif. Thermodynamic and structural studies of CaM-Nav1.2IQp interactions show that apo and (Ca2+)4-CaM adopt distinct conformations that both permit tight association with Nav1.2IQp during gating.
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DOI:
10.1016/j.str.2008.07.010
发表时间:
2008-10-08
期刊:
Structure (London, England : 1993)
影响因子:
--
作者:
Kim EY;Rumpf CH;Fujiwara Y;Cooley ES;Van Petegem F;Minor DL Jr
通讯作者:
Minor DL Jr
影响因子:
64.8
作者:
Drum, CL;Yan, SZ;Tang, WJ
通讯作者:
Tang, WJ
DOI:
10.1107/s0907444998003254
发表时间:
1998-09-01
期刊:
ACTA CRYSTALLOGRAPHICA SECTION D-BIOLOGICAL CRYSTALLOGRAPHY
影响因子:
--
作者:
Brunger, AT;Adams, PD;Warren, GL
通讯作者:
Warren, GL
影响因子:
5.7
作者:
Ataman, Zeynep Akyol;Gakhar, Lokesh;Shea, Madeline A.
通讯作者:
Shea, Madeline A.
影响因子:
2.7
作者:
DELAGLIO, F;GRZESIEK, S;BAX, A
通讯作者:
BAX, A