title: Engineering a Prototypic P-type ATPase Listeria monocytogenes Ca(2+)-ATPase 1 for Single-Molecule FRET Studies.
abstract: Approximately 30% of the ATP generated in the living cell is utilized by P-type ATPase primary active transporters to generate and maintain electrochemical gradients across biological membranes. P-type ATPases undergo large conformational changes during their functional cycle to couple ATP hydrolysis in the cytoplasmic domains to ion transport across the membrane. The Ca(2+)-ATPase from Listeria monocytogenes, LMCA1, was found to be a suitable model of P-type ATPases and was engineered to facilitate single-molecule FRET studies of transport-related structural changes. Mutational analyses of the endogenous cysteine residues in LMCA1 were performed to reduce background labeling without compromising activity. Pairs of cysteines were introduced into the optimized low-reactivity background, and labeled with maleimide derivatives of Cy3 and Cy5 resulting in site-specifically double-labeled protein with moderate activity. Ensemble and confocal single-molecule FRET studies revealed changes in FRET distribution related to structural changes during the transport cycle, consistent with those observed by X-ray crystallography for the sarco/endoplasmic reticulum Ca(2+) ATPase (SERCA). Notably, the cytosolic headpiece of LMCA1 was found to be distinctly more compact in the E1 state than in the E2 state. Thus, the established experimental system should allow future real-time FRET studies of the structural dynamics of LMCA1 as a representative P-type ATPase.
authors: Centre for Membrane Pumps in Cells and Disease - PUMPKIN. Danish National Research Foundation & Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, and Department of Molecular Biology and Genetics, Aarhus University , Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark.|Interdisciplinary Nanoscience Center (iNANO), Aarhus University , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.
authors: Mateusz
authors: M
authors: Dyla
authors: Centre for Membrane Pumps in Cells and Disease - PUMPKIN. Danish National Research Foundation & Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, and Department of Molecular Biology and Genetics, Aarhus University , Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark.
authors: Jacob Lauwring
authors: JL
authors: Andersen
authors: Centre for Membrane Pumps in Cells and Disease - PUMPKIN. Danish National Research Foundation & Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, and Department of Molecular Biology and Genetics, Aarhus University , Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark.|Interdisciplinary Nanoscience Center (iNANO), Aarhus University , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.|AIAS, Aarhus Institute of Advanced Studies, Aarhus University , DK-8000 Aarhus C, Denmark.
authors: Magnus
authors: M
authors: Kjaergaard
authors: Interdisciplinary Nanoscience Center (iNANO), Aarhus University , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.
authors: Victoria
authors: V
authors: Birkedal
authors: Department of Physiology and Biophysics, Weill Cornell Medicine , New York, New York 10021, United States.
authors: Daniel S
authors: DS
authors: Terry
authors: Department of Physiology and Biophysics, Weill Cornell Medicine , New York, New York 10021, United States.
authors: Roger B
authors: RB
authors: Altman
authors: Department of Physiology and Biophysics, Weill Cornell Medicine , New York, New York 10021, United States.
authors: Scott C
authors: SC
authors: Blanchard
authors: Centre for Membrane Pumps in Cells and Disease - PUMPKIN. Danish National Research Foundation & Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, and Department of Molecular Biology and Genetics, Aarhus University , Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark.|Interdisciplinary Nanoscience Center (iNANO), Aarhus University , Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.
authors: Poul
authors: P
authors: Nissen
authors: Centre for Membrane Pumps in Cells and Disease - PUMPKIN. Danish National Research Foundation & Danish Research Institute of Translational Neuroscience - DANDRITE, Nordic-EMBL Partnership for Molecular Medicine, and Department of Molecular Biology and Genetics, Aarhus University , Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark.
authors: Charlotte R
authors: CR
authors: Knudsen
mesh_terms: D000252:Calcium-Transporting ATPases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D031541:Fluorescence Resonance Energy Transfer; D008089:Listeria monocytogenes / Q000201:enzymology*; D008301:Maleimides / Q000737:chemistry; D008958:Models, Molecular; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D011487:Protein Conformation; D015202:Protein Engineering
chemical_list: D008301:Maleimides; C043592:maleimide; D000252:Calcium-Transporting ATPases