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After dopamine binding, the dopamine receptor changes his shape and binds the inactive G protein.The G protein expels its GDP molecule replacing it by GTP. and falls into two pieces. The Galpha subunit binds to and activates the enzyme adenylyl cyclase, which produces then cyclic AMP spreading a signal through the cell.

ATP Synthase Protein - 3d rendered image. Medical microbiology concept. Structure and conformational states of the bovine mitochondrial ATP (Adenosine triphosphate) synthase. Chemical energy is synthesized in eukaryotic cells primarily. Hydrolase. Hologram view. HUD, FUI

3D cartoon and Gaussian surface models, PDB 2e5d, white background

A molecular model of Adenosine Triphosphate, or ATP. It plays a vital biological role in transporting chemical energy between living cells.

Proteasomes are molecular machines for breaking down proteins called proteolysis, only target proteins that have been marked for destruction called ubiquitin to the target protein, 3d rendering

Molecular Model of Human Insulin with disulfide bonds shown.

Mutations on the spike protein coronavirus uses to attach to human cells. Omicron variant spike protein bound with the human ACE2 receptor.

Cystic fibrosis transmembrane conductance regulator (CFTR) allows negatively-charged ions, such as chloride and bicarbonate, to pass through the membrane of lung epithell cells. Malfunction leads to cystic fibrosis. Left: inactive form. ATP (red)

$The three-dimensional structure of proteins is represented in a variety of conformations. This image is based on the ribbon structure of a protein. It is suitable for biology notebooks and book covers.\nThis image has not been created by AI.$

Vacuolar-type ATPase (V-ATPase) is a highly conserved evolutionarily ancient enzyme with remarkably diverse functions in eukaryotic organisms. V-ATPases acidify a wide array of intracellular organelles and pump protons across the plasma membranes of numerous cell types. 3D cartoon and Gaussian surface models, based on PDB 6wm2, white background.

Endosomes - 3d rendered image of Endosomes are membrane-bound organelles. They are parts of endocytic membrane transport pathway. Endomembrane system in cells. Bilayer Lipid Membrane. Abstract medical illustration. Microscopic view. Microbiologic research concept.

Rendering of the atomic structure of an antibody variable region.

Cell Membrane Phospholipid Structure,Phospholipid bilayer of the cell membrane,Lipid bilayer,lipid bi-layer cell anatomy

The translation of a nucleotide (DNA or RNA) sequence to a protein sequence 3d rendering

3D Rendered Illustration, visualization of Neurons firing neurotransmitters in the synaptic gap.

A GTP-bound G-alpha protein (blue) binds to and activates the enzyme adenylyl cyclase, which produces then cyclic AMP spreading a signal through the cell.

$Phospholipid bilayer membrane structures that make up living cells and their contents. This is an image of membrane proteins in the membrane.\nThis image, which looks like a plastic model, evokes biology and biochemistry. It can be used as a cover for magazines, textbooks and presentation materials.\nThis image was not created by AI.$

3D cartoon and Gaussian surface models, PDB 6vg8, white background

A ball and stick + ribbons model of beta-secretase - a protein that is important in forming healthy peripheral nerve cells, but is also involved in the onset of Alzheimer's disease.

Immunoglobulin G (IgG) - 3d rendered image. Microbiology illustration the structure of an antibody. The Y-shaped structure. IgG is the most common type of antibody.

Neurotoxin concept Neurotoxin of type A of bacterium Clostridium botulinum which causes food intoxication botulism, molecular model 3d rendering

The electron transport chain is a series of proteins and organic molecules found in the inner membrane of the mitochondria 3d rendering

Bacterial multidrug efflux pumps (E-CmeB) expel antibiotics from inside the bacterium (bottom): ciprofloxacin (yellow), chloramphenicol (violet), ampicillin (red).

Cell Membrane Phospholipid Structure,Phospholipid bilayer of the cell membrane,Lipid bilayer

ACE2 is a receptor of SARS-CoV-2 spike glycoprotein. Surface model, white background, 3D illustration

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Recombinant human insulin. 3d cartoon model based on protein data bank

Free Images: "bestof:Mechanism for the binding of ATP and then Ubiquitin substrate to the ubiquitin activating enzyme.png en A mechanism showing how ATP and the ubiquitin substrate"

Substrate-level phosphorylation generating ATP.svg

Animal mitochondrion diagram en (edit).svg

Animal mitochondrion diagram unlabelled.svg

Mechanism for the binding of ATP and then Ubiquitin substrate to the ubiquitin activating enzyme.png

Ubiquitin-activating enzyme bound to ATP and ubiquitin substrate.png

Ubiquitin-activating enzyme bound to Ubiquitin.png

Simple mechanism of enzyme reaction (zh-tw).png

Ubiquitin activating enzyme cysteine highlighted.png

Cys and Arg active site of ubiquitin activating enzyme.png

Anthrax-toxin-edema-factor+calmodulin 1XVF.png

Nucleophilic Epoxidation Mechanism2.tiff

Substrate-like inhibitors and binding to the DPP-4 complex.png

Simple mechanism of enzyme reaction zh.png