- EMDB-48154: single particle cryo EM density of full length rat Kir4.1 -
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基本情報
登録情報
データベース: EMDB / ID: EMD-48154
タイトル
single particle cryo EM density of full length rat Kir4.1
マップデータ
single particle cryo EM map of full length rat Kir4.1 in complex with a LC8 dimer
試料
複合体: Complex between Kir4.1 and dynein light chain 1 dimer
複合体: Kir4.1
複合体: dynein light chain 1
タンパク質・ペプチド: rat Kir4.1
タンパク質・ペプチド: Dynein light chain 1
キーワード
Potassium ion channel Complex with auxiliary proteins / TRANSPORT PROTEIN
機能・相同性
機能・相同性情報
glutamate reuptake / Potassium transport channels / nitric-oxide synthase inhibitor activity / deoxyribonuclease inhibitor activity / negative regulation of DNA strand resection involved in replication fork processing / negative regulation of phosphorylation / intraciliary retrograde transport / L-glutamate import / central nervous system myelination / motile cilium assembly ...glutamate reuptake / Potassium transport channels / nitric-oxide synthase inhibitor activity / deoxyribonuclease inhibitor activity / negative regulation of DNA strand resection involved in replication fork processing / negative regulation of phosphorylation / intraciliary retrograde transport / L-glutamate import / central nervous system myelination / motile cilium assembly / Activation of BIM and translocation to mitochondria / ciliary tip / response to blue light / Intraflagellar transport / regulation of resting membrane potential / negative regulation of nitric oxide biosynthetic process / regulation of monoatomic ion transmembrane transport / inward rectifier potassium channel activity / potassium ion homeostasis / optic nerve development / non-motile cilium assembly / oligodendrocyte development / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / membrane hyperpolarization / dynein complex / cellular response to potassium ion / COPI-independent Golgi-to-ER retrograde traffic / adult walking behavior / cytoplasmic dynein complex / response to mineralocorticoid / astrocyte projection / Macroautophagy / ciliary base / microvillus / potassium ion import across plasma membrane / dynein intermediate chain binding / tertiary granule membrane / ficolin-1-rich granule membrane / enzyme inhibitor activity / spermatid development / monoatomic ion channel complex / potassium channel activity / positive regulation of insulin secretion involved in cellular response to glucose stimulus / COPI-mediated anterograde transport / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / potassium ion transmembrane transport / visual perception / axon cytoplasm / Mitotic Prometaphase / substantia nigra development / EML4 and NUDC in mitotic spindle formation / Loss of Nlp from mitotic centrosomes / Loss of proteins required for interphase microtubule organization from the centrosome / Recruitment of mitotic centrosome proteins and complexes / MHC class II antigen presentation / Recruitment of NuMA to mitotic centrosomes / Anchoring of the basal body to the plasma membrane / response to glucocorticoid / Resolution of Sister Chromatid Cohesion / HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand / AURKA Activation by TPX2 / regulation of membrane potential / establishment of localization in cell / RHO GTPases Activate Formins / regulation of long-term neuronal synaptic plasticity / kinetochore / potassium ion transport / Aggrephagy / Separation of Sister Chromatids / HCMV Early Events / Regulation of PLK1 Activity at G2/M Transition / mitotic spindle / site of double-strand break / presynapse / cell body / scaffold protein binding / basolateral plasma membrane / microtubule / cytoskeleton / cilium / apical plasma membrane / signaling receptor binding / apoptotic process / centrosome / DNA damage response / Neutrophil degranulation / protein-containing complex binding / enzyme binding / mitochondrion / ATP binding / identical protein binding / nucleus / membrane / plasma membrane / cytosol / cytoplasm 類似検索 - 分子機能
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
R35 ML140024
米国
引用
ジャーナル: J Biol Chem / 年: 2025 タイトル: Dynein light chains 1 and 2 are auxiliary proteins of pH-sensitive Kir4.1 channels. 著者: Sun-Joo Lee / Jian Gao / Ellen Thompson / Jonathan Mount / Colin G Nichols / 要旨: Inward rectifier Kir4.1 potassium channels are abundantly expressed in cells that are important for electrolyte homeostasis. Dysregulation of Kir4.1 underlies various neurological disorders. Here, ...Inward rectifier Kir4.1 potassium channels are abundantly expressed in cells that are important for electrolyte homeostasis. Dysregulation of Kir4.1 underlies various neurological disorders. Here, through biochemical and structural studies of full-length Kir4.1, we show that dynein light chain 1 and 2 proteins, also as known as LC8, copurify with Kir4.1 at stoichiometric levels. Direct interaction between Kir4.1 and LC8 is supported by in vitro binding assays and reiterated with native Kir4.1 proteins from mouse brain. Notably, we identify a LC8 binding motif in the unstructured N terminus of Kir4.1. Among Kir subtypes, the motif is unique to Kir4.1 and is highly conserved between Kir4.1 orthologs. Deletion of the predicted anchoring sequence (ΔTQT) resulted in loss of LC8 interaction with Kir4.1 N-terminal peptides as well as with full-length Kir4.1, suggesting that the binding site is necessary and sufficient for the interaction. Purified Kir4.1-ΔTQT mutant proteins exhibited normal channel activity in vitro, whereas WT proteins lost phosphoinositide-(4,5)-phosphate activation. Single-particle cryo-EM analysis of the full-length proteins revealed extremely heterogeneous particles, indicating deformation from the typical fourfold symmetric conformation. Additional electron density attached to the Kir4.1 tetramer, ascribed to an LC8 dimer, further supports the direct interaction between the two proteins. While the biological implications of this interaction await further elucidation, the strong conservation of the LC8 binding motif suggests its potential importance in the regulation of Kir4.1 channels.