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- PDB-4gow: Crystal Structure of Ca2+/CaM:Kv7.4 (KCNQ4) B helix complex -

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Basic information

Entry
Database: PDB / ID: 4gow
TitleCrystal Structure of Ca2+/CaM:Kv7.4 (KCNQ4) B helix complex
Components
  • Calmodulin
  • Potassium voltage-gated channel subfamily KQT member 4
KeywordsPROTEIN BINDING / protein complex / ion channel / calmodulin / potassium channel
Function / homology
Function and homology information


: / : / : / : / : / positive regulation of protein autophosphorylation / negative regulation of peptidyl-threonine phosphorylation / Voltage gated Potassium channels / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding ...: / : / : / : / : / positive regulation of protein autophosphorylation / negative regulation of peptidyl-threonine phosphorylation / Voltage gated Potassium channels / establishment of protein localization to mitochondrial membrane / type 3 metabotropic glutamate receptor binding / CaM pathway / Sensory processing of sound by outer hair cells of the cochlea / positive regulation of peptidyl-threonine phosphorylation / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / Sensory processing of sound by inner hair cells of the cochlea / Reduction of cytosolic Ca++ levels / positive regulation of DNA binding / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Loss of phosphorylation of MECP2 at T308 / inner ear morphogenesis / CREB1 phosphorylation through the activation of Adenylate Cyclase / CaMK IV-mediated phosphorylation of CREB / PKA activation / response to corticosterone / negative regulation of high voltage-gated calcium channel activity / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of ryanodine-sensitive calcium-release channel activity / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / negative regulation of calcium ion export across plasma membrane / regulation of cardiac muscle cell action potential / presynaptic endocytosis / nitric-oxide synthase binding / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / regulation of synaptic vesicle exocytosis / Phase 0 - rapid depolarisation / calcineurin-mediated signaling / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / adenylate cyclase binding / regulation of ryanodine-sensitive calcium-release channel activity / protein phosphatase activator activity / Long-term potentiation / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / positive regulation of protein serine/threonine kinase activity / DARPP-32 events / voltage-gated potassium channel activity / catalytic complex / Smooth Muscle Contraction / detection of calcium ion / regulation of synaptic vesicle endocytosis / regulation of cardiac muscle contraction / potassium channel activity / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / activation of adenylate cyclase activity / cellular response to interferon-beta / Protein methylation / phosphatidylinositol 3-kinase binding / calcium channel inhibitor activity / Activation of AMPK downstream of NMDARs / presynaptic cytosol / positive regulation of nitric-oxide synthase activity / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / enzyme regulator activity / eNOS activation / titin binding / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / sperm midpiece / regulation of calcium-mediated signaling / voltage-gated potassium channel complex / potassium ion transmembrane transport / calcium channel complex / FCERI mediated Ca+2 mobilization / substantia nigra development / Ras activation upon Ca2+ influx through NMDA receptor / regulation of heart rate / FCGR3A-mediated IL10 synthesis / basal plasma membrane / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / calyx of Held / response to amphetamine / adenylate cyclase activator activity / sarcomere / VEGFR2 mediated cell proliferation / protein serine/threonine kinase activator activity / nitric-oxide synthase regulator activity / VEGFR2 mediated vascular permeability
Similarity search - Function
Potassium channel, voltage dependent, KCNQ / Potassium channel, voltage dependent, KCNQ, C-terminal / KCNQ voltage-gated potassium channel / : / EF-hand domain pair / EF-hand, calcium binding motif / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. / EF-hand calcium-binding domain profile. / EF-hand domain ...Potassium channel, voltage dependent, KCNQ / Potassium channel, voltage dependent, KCNQ, C-terminal / KCNQ voltage-gated potassium channel / : / EF-hand domain pair / EF-hand, calcium binding motif / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. / EF-hand calcium-binding domain profile. / EF-hand domain / Ion transport domain / Ion transport protein / EF-hand domain pair
Similarity search - Domain/homology
Calmodulin-1 / Potassium voltage-gated channel subfamily KQT member 4 / Calmodulin-3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.6 Å
AuthorsXu, Q. / Chang, A. / Tolia, A. / Minor Jr., D.L.
CitationJournal: J.Mol.Biol. / Year: 2013
Title: Structure of a Ca(2+)/CaM:Kv7.4 (KCNQ4) B-helix complex provides insight into M current modulation.
Authors: Xu, Q. / Chang, A. / Tolia, A. / Minor, D.L.
History
DepositionAug 20, 2012Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 12, 2012Provider: repository / Type: Initial release
Revision 1.1May 22, 2013Group: Database references
Revision 1.2Feb 28, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_struct_conn_angle / struct_conn / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.pdbx_dist_value / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
D: Calmodulin
A: Potassium voltage-gated channel subfamily KQT member 4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)24,7076
Polymers24,5472
Non-polymers1604
Water32418
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area3280 Å2
ΔGint-72 kcal/mol
Surface area9560 Å2
MethodPISA
Unit cell
Length a, b, c (Å)104.075, 104.075, 113.729
Angle α, β, γ (deg.)90.00, 90.00, 120.00
Int Tables number179
Space group name H-MP6522

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Components

#1: Protein Calmodulin / CaM


Mass: 16334.926 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human)
Gene: CALM1, CALM, CAM, CAM1, CALM2, CAM2, CAMB, CALM3, CALML2, CAM3, CAMC, CAMIII
Plasmid: pET28 / Production host: Escherichia coli (E. coli) / Strain (production host): BL21(DE3)pLysS / References: UniProt: P62158, UniProt: P0DP23*PLUS
#2: Protein Potassium voltage-gated channel subfamily KQT member 4 / KQT-like 4 / Potassium channel subunit alpha KvLQT4 / Voltage-gated potassium channel subunit Kv7.4


Mass: 8211.675 Da / Num. of mol.: 1 / Fragment: UNP residues 522-593
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KCNQ4 / Plasmid: pET28 / Production host: Escherichia coli (E. coli) / Strain (production host): BL21(DE3)pLysS / References: UniProt: P56696
#3: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Ca
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 18 / Source method: isolated from a natural source / Formula: H2O

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 1

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Sample preparation

CrystalDensity Matthews: 3.63 Å3/Da / Density % sol: 66.1 %
Crystal growTemperature: 298 K / Method: vapor diffusion, hanging drop / pH: 6
Details: 1.6M ammonium sulfate, 0.2M sodium citrate (pH 6.0), 0.1M sodium tartrate, 4% isopropanol, VAPOR DIFFUSION, HANGING DROP, temperature 298K

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Data collection

Diffraction sourceSource: SYNCHROTRON / Site: SSRL / Beamline: BL12-2 / Wavelength: 1.006 Å
DetectorDetector: CCD
RadiationMonochromator: LN2-cooled monochromator Si(220), Phi=0 or 90 degrees
Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.006 Å / Relative weight: 1
ReflectionResolution: 2.6→90.131 Å / Num. all: 11737 / Num. obs: 11737 / % possible obs: 100 % / Redundancy: 16.7 % / Rsym value: 0.103 / Net I/σ(I): 18.9
Reflection shell
Resolution (Å)Redundancy (%)Rmerge(I) obsMean I/σ(I) obsRsym valueDiffraction-ID% possible all
2.6-2.7412.70.9650.80.9651100
2.74-2.9117.70.71.10.71100
2.91-3.1117.80.4261.80.4261100
3.11-3.3617.80.2263.40.2261100
3.36-3.6817.60.1314.80.1311100
3.68-4.1117.50.08580.0851100
4.11-4.7517.30.06110.70.0611100
4.75-5.81170.0748.50.0741100
5.81-8.2216.40.0599.80.0591100
8.22-113.7314.20.04114.30.041199.6

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Processing

Software
NameVersionClassificationNB
MOSFLM3.3.9data reduction
SCALA3.3.9data scaling
PHENIX1.7.2_869refinement
PDB_EXTRACT3.11data extraction
HKL-2000data collection
PHASERphasing
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2.6→48.093 Å / Occupancy max: 1 / Occupancy min: 1 / SU ML: 0.57 / σ(F): 1.34 / Phase error: 27.71 / Stereochemistry target values: ML
RfactorNum. reflection% reflection
Rfree0.2682 562 4.8 %
Rwork0.2363 --
obs0.2379 11699 99.97 %
Solvent computationShrinkage radii: 0.98 Å / VDW probe radii: 1.2 Å / Solvent model: FLAT BULK SOLVENT MODEL / Bsol: 55.168 Å2 / ksol: 0.352 e/Å3
Displacement parameters
Baniso -1Baniso -2Baniso -3
1--3.826 Å2-0 Å20 Å2
2---3.826 Å2-0 Å2
3---7.6519 Å2
Refinement stepCycle: LAST / Resolution: 2.6→48.093 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1338 0 4 18 1360
Refine LS restraints
Refine-IDTypeDev idealNumber
X-RAY DIFFRACTIONf_bond_d0.0031351
X-RAY DIFFRACTIONf_angle_d0.791809
X-RAY DIFFRACTIONf_dihedral_angle_d19.503522
X-RAY DIFFRACTIONf_chiral_restr0.055202
X-RAY DIFFRACTIONf_plane_restr0.003241
LS refinement shell
Resolution (Å)Rfactor RfreeNum. reflection RfreeRfactor RworkNum. reflection RworkRefine-ID% reflection obs (%)
2.6001-2.86170.40551480.32522692X-RAY DIFFRACTION100
2.8617-3.27580.33941180.27882755X-RAY DIFFRACTION100
3.2758-4.12680.28891390.22142758X-RAY DIFFRACTION100
4.1268-48.10110.22011570.21752932X-RAY DIFFRACTION100
Refinement TLS params.

Method: refined / Refine-ID: X-RAY DIFFRACTION

IDL11 (°2)L12 (°2)L13 (°2)L22 (°2)L23 (°2)L33 (°2)S11 (Å °)S12 (Å °)S13 (Å °)S21 (Å °)S22 (Å °)S23 (Å °)S31 (Å °)S32 (Å °)S33 (Å °)T11 (Å2)T12 (Å2)T13 (Å2)T22 (Å2)T23 (Å2)T33 (Å2)Origin x (Å)Origin y (Å)Origin z (Å)
14.50140.4108-0.36676.6490.01444.3616-0.24340.42090.2464-0.21870.56990.44360.20980.0766-0.26630.2971-0.0618-0.22120.22690.02730.2564-34.655227.7043-4.8043
24.74421.93050.96744.44830.24932.91590.32940.8231-0.4348-0.2621-0.329-0.16920.6169-0.21840.0580.432-0.1136-0.11890.69310.01610.3349-14.747627.5235.6861
32.82971.0775-1.56157.0852-1.31726.75790.2694-0.4431-0.41620.8272-0.01250.03220.17070.2715-0.10750.30570.0607-0.17830.25110.01420.264-34.070427.38852.9346
Refinement TLS group
IDRefine-IDRefine TLS-IDSelection details
1X-RAY DIFFRACTION1chain 'D' and (resseq 3:78)
2X-RAY DIFFRACTION2chain 'D' and (resseq 81:146)
3X-RAY DIFFRACTION3chain 'A' and (resseq 524:549)

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