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- PDB-7d99: human potassium-chloride co-transporter KCC4 -

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Basic information

Entry
Database: PDB / ID: 7d99
Titlehuman potassium-chloride co-transporter KCC4
Componentspotassium-chloride co-transporter KCC4
KeywordsTRANSPORT PROTEIN / potassium-chloride / co-transporter
Function / homology
Function and homology information


ammonium import across plasma membrane / potassium:chloride symporter activity / Cation-coupled Chloride cotransporters / chloride ion homeostasis / ammonium channel activity / potassium ion homeostasis / cell volume homeostasis / potassium ion import across plasma membrane / plasma membrane => GO:0005886 / monoatomic ion transport ...ammonium import across plasma membrane / potassium:chloride symporter activity / Cation-coupled Chloride cotransporters / chloride ion homeostasis / ammonium channel activity / potassium ion homeostasis / cell volume homeostasis / potassium ion import across plasma membrane / plasma membrane => GO:0005886 / monoatomic ion transport / chloride transmembrane transport / chemical synaptic transmission / synapse / protein kinase binding / protein-containing complex / plasma membrane
Similarity search - Function
K/Cl co-transporter 4 / K/Cl co-transporter / SLC12A transporter family / SLC12A transporter, C-terminal / Solute carrier family 12 / Amino acid permease/ SLC12A domain / Amino acid permease
Similarity search - Domain/homology
: / Solute carrier family 12 member 7
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsXie, Y. / Chang, S. / Zhao, C. / Ye, S. / Guo, J.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31870724 China
CitationJournal: Sci Adv / Year: 2020
Title: Structures and an activation mechanism of human potassium-chloride cotransporters.
Authors: Yuan Xie / Shenghai Chang / Cheng Zhao / Feng Wang / Si Liu / Jin Wang / Eric Delpire / Sheng Ye / Jiangtao Guo /
Abstract: Potassium-chloride cotransporters KCC1 to KCC4 mediate the coupled export of potassium and chloride across the plasma membrane and play important roles in cell volume regulation, auditory system ...Potassium-chloride cotransporters KCC1 to KCC4 mediate the coupled export of potassium and chloride across the plasma membrane and play important roles in cell volume regulation, auditory system function, and γ-aminobutyric acid (GABA) and glycine-mediated inhibitory neurotransmission. Here, we present 2.9- to 3.6-Å resolution structures of full-length human KCC2, KCC3, and KCC4. All three KCCs adopt a similar overall architecture, a domain-swap dimeric assembly, and an inward-facing conformation. The structural and functional studies reveal that one unexpected N-terminal peptide binds at the cytosolic facing cavity and locks KCC2 and KCC4 at an autoinhibition state. The C-terminal domain (CTD) directly interacts with the N-terminal inhibitory peptide, and the relative motions between the CTD and the transmembrane domain (TMD) suggest that CTD regulates KCCs' activities by adjusting the autoinhibitory effect. These structures provide the first glimpse of full-length structures of KCCs and an autoinhibition mechanism among the amino acid-polyamine-organocation transporter superfamily.
History
DepositionOct 12, 2020Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Dec 30, 2020Provider: repository / Type: Initial release

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Structure visualization

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Assembly

Deposited unit
A: potassium-chloride co-transporter KCC4
B: potassium-chloride co-transporter KCC4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)248,05712
Polymers246,1392
Non-polymers1,91810
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area9630 Å2
ΔGint-52 kcal/mol
Surface area76870 Å2

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Components

#1: Protein potassium-chloride co-transporter KCC4 / Electroneutral potassium-chloride cotransporter 4 / K-Cl cotransporter 4


Mass: 123069.492 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC12A7, KCC4 / Cell line (production host): HEK293T / Production host: Homo sapiens (human) / References: UniProt: Q9Y666
#2: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#3: Chemical ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: K / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical
ChemComp-CL / CHLORIDE ION / Chloride


Mass: 35.453 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Cl / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: potassium-chloride cotransporter 4 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293T
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 62 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.13_2998: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 95572 / Symmetry type: POINT

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