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This is a searchable collection of scientific photos, illustrations, and videos. The images and videos in this gallery are licensed under Creative Commons Attribution Non-Commercial ShareAlike 3.0. This license lets you remix, tweak, and build upon this work non-commercially, as long as you credit and license your new creations under identical terms.
Seeing signaling protein activation in cells 04
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Cdc42, a member of the Rho family of small guanosine triphosphatase (GTPase) proteins, regulates multiple cell functions, including motility, proliferation, apoptosis, and cell morphology. Klaus Hahn, University of North Carolina, Chapel Hill Medical School View MediaShiga toxin
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E. coli bacteria normally live harmlessly in our intestines, but some cause disease by making toxins. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View MediaPig trypsin crystal
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A crystal of pig trypsin protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View MediaNucleosome
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Like a strand of white pearls, DNA wraps around an assembly of special proteins called histones (colored) to form the nucleosome, a structure responsible for regulating genes and condensing DNA strand Karolin Luger, Colorado State University View MediaCryo-electron microscopy revealing the "wasabi receptor"
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The TRPA1 protein is responsible for the burn you feel when you taste a bite of sushi topped with wasabi. Jean-Paul Armache, UCSF View MediaPig trypsin (2)
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A crystal of porcine trypsin protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View MediaDynamic cryo-EM model of the human transcription preinitiation complex
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Gene transcription is a process by which information encoded in DNA is transcribed into RNA. Eva Nogales, Berkeley Lab View MediaGroup of fluorescent C. elegans showing muscle and ribosomal protein
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Three C. elegans, tiny roundworms, with a ribosomal protein glowing red and muscle fibers glowing green. Researchers used these worms to study a molecular pathway that affects aging. Jarod Rollins, Mount Desert Island Biological Laboratory. View MediaVDAC-1 (2)
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The structure of the pore-forming protein VDAC-1 from humans. Gerhard Wagner, Harvard Medical School View MediaThe Structure of Cilia’s Doublet Microtubules
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Cilia (cilium in singular) are complex molecular machines found on many of our cells. Brown Lab, Harvard Medical School and Veronica Falconieri Hays View MediaG switch (with labels and stages)
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The G switch allows our bodies to respond rapidly to hormones. G proteins act like relay batons to pass messages from circulating hormones into cells. Crabtree + Company View MediaVDAC video 03
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This video shows the structure of the pore-forming protein VDAC-1 from humans. Gerhard Wagner, Harvard Medical School View MediaMicrotubule dynamics in real time
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Cytoplasmic linker protein (CLIP)-170 is a microtubule plus-end-tracking protein that regulates microtubule dynamics and links microtubule ends to different intracellular structures. Gary Borisy, Marine Biology Laboratory View MediaRNA polymerase
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RNA polymerase (purple) is a complex enzyme at the heart of transcription. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media3D image of actin in a cell
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Actin is an essential protein in a cell's skeleton (cytoskeleton). It forms a dense network of thin filaments in the cell. Xiaowei Zhuang, Howard Hughes Medical Institute, Harvard University View MediaActive Site of E. coli response regulator PhoB
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Active site of E. coli response regulator PhoB. Ann Stock, Rutgers University View MediaZ rings in bacterial division
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Lab-made liposomes contract where Z rings have gathered together and the constriction forces are greatest (arrows). Masaki Osawa, Duke University View MediaHen egg lysozyme (2)
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A crystal of hen egg lysozyme protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View MediaMost abundant protein in M. tuberculosis
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Model of a protein, antigen 85B, that is the most abundant protein exported by Mycobacterium tuberculosis, which causes most cases of tuberculosis. Mycobacterium Tuberculosis Center, PSI View MediaEnzyme reaction
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Enzymes speed up chemical reactions by reducing the amount of energy needed for the reactions. NIGMS View MediaProtein formation
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Proteins are 3D structures made up of smaller units. DNA is transcribed to RNA, which in turn is translated into amino acids. NIGMS, with the folded protein illustration adapted from Jane Richardson, Duke University Medical Center View MediaProtein rv2844 from M. tuberculosis
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This crystal structure shows a conserved hypothetical protein from Mycobacterium tuberculosis. Only 12 other proteins share its sequence homology, and none has a known function. Integrated Center for Structure and Function Innovation View MediaRhodopsin bound to visual arrestin
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Rhodopsin is a pigment in the rod cells of the retina (back of the eye). It is extremely light-sensitive, supporting vision in low-light conditions. Protein Data Bank. View MediaAntitoxin GhoS (Illustration 2)
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Structure of the bacterial antitoxin protein GhoS. GhoS inhibits the production of a bacterial toxin, GhoT, which can contribute to antibiotic resistance. Rebecca Page and Wolfgang Peti, Brown University and Thomas K. Wood, Pennsylvania State University View MediaPig trypsin (1)
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A crystal of porcine trypsin protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View MediaJack bean concanavalin A
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Crystals of jack bean concanavalin A protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View MediaFruit fly embryo
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Cells in an early-stage fruit fly embryo, showing the DIAP1 protein (pink), an inhibitor of apoptosis. Hermann Steller, Rockefeller University View MediaMap of protein structures 02
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A global "map of the protein structure universe" indicating the positions of specific proteins. Berkeley Structural Genomics Center, PSI View MediaHeat shock protein complex from Methanococcus jannaschii
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Model based on X-ray crystallography of the structure of a small heat shock protein complex from the bacteria, Methanococcus jannaschii. Berkeley Structural Genomics Center, PSI-1 View MediaH1 histamine receptor
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The receptor is shown bound to an inverse agonist, doxepin. Raymond Stevens, The Scripps Research Institute View MediaMouse brain slice showing nerve cells
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A 20-µm thick section of mouse midbrain. The nerve cells are transparent and weren’t stained. Michael Shribak, Marine Biological Laboratory/University of Chicago. View MediaHimastatin and bacteria
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A model of the molecule himastatin overlaid on an image of Bacillus subtilis bacteria. Mohammad Movassaghi, Massachusetts Institute of Technology. View MediaBeta-galactosidase montage showing cryo-EM improvement--gradient background
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Composite image of beta-galactosidase showing how cryo-EM’s resolution has improved dramatically in recent years. Older images to the left, more recent to the right. Veronica Falconieri, Sriram Subramaniam Lab, National Cancer Institute View MediaCell Nucleus and Lipid Droplets
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A cell nucleus (blue) surrounded by lipid droplets (yellow). James Olzmann, University of California, Berkeley View MediaSortase b from B. anthracis
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Structure of sortase b from the bacterium B. anthracis, which causes anthrax. Sortase b is an enzyme used to rob red blood cells of iron, which the bacteria need to survive. Midwest Center for Structural Genomics, PSI View MediatRNA splicing enzyme endonuclease in humans
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An NMR solution structure model of the transfer RNA splicing enzyme endonuclease in humans (subunit Sen15). This represents the first structure of a eukaryotic tRNA splicing endonuclease subunit. Center for Eukaryotic Structural Genomics, PSI View MediaHsp33 figure 1
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Featured in the March 15, 2012 issue of Biomedical Beat. Related to Hsp33 Figure 2, image 3355. Ursula Jakob and Dana Reichmann, University of Michigan View MediaDNA replication origin recognition complex (ORC)
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A study published in March 2012 used cryo-electron microscopy to determine the structure of the DNA replication origin recognition complex (ORC), a semi-circular, protein complex (yellow) that recogni Huilin Li, Brookhaven National Laboratory View MediaEpithelial cell migration
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High-resolution time lapse of epithelial (skin) cell migration and wound healing. It shows an image taken every 13 seconds over the course of almost 14 minutes. Michael Shribak, Marine Biological Laboratory/University of Chicago. View MediaStetten Lecture 2017poster image
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This image is featured on the poster for Dr. Rommie Amaro's 2017 Stetten Lecture. Dr. Rommie Amaro, University of California, San Diego View MediaX-ray co-crystal structure of Src kinase bound to a DNA-templated macrocycle inhibitor 7
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X-ray co-crystal structure of Src kinase bound to a DNA-templated macrocycle inhibitor. Markus A. Seeliger, Stony Brook University Medical School and David R. Liu, Harvard University View MediaArtificial cilia exhibit spontaneous beating
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Researchers have created artificial cilia that wave like the real thing. Zvonimir Dogic View MediaBeta-galactosidase montage showing cryo-EM improvement--transparent background
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Composite image of beta-galactosidase showing how cryo-EM’s resolution has improved dramatically in recent years. Older images to the left, more recent to the right. Veronica Falconieri, Sriram Subramaniam Lab, National Cancer Institute View MediaSection of an electron density map
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Electron density maps such as this one are generated from the diffraction patterns of X-rays passing through protein crystals. The Southeast Collaboratory for Structural Genomics View MediaHistone deacetylases
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The human genome contains much of the information needed for every cell in the body to function. However, different types of cells often need different types of information. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View MediaA molecular switch strips transcription factor from DNA
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In this video, Rice University scientists used molecular modeling with a mathematical algorithm called AWSEM (for associative memory, water-mediated, structure and energy model) and structural data to Davit Potoyan and Peter Wolynes View MediaStructure of telomerase
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Scientists recently discovered the full molecular structure of telomerase, an enzyme important to aging and cancer. Jiansen Jiang, Edward J. Miracco, Z. Hong Zhou and Juli Feigon, University of California, Los Angeles; Kathleen Collins, University of California, Berkeley View MediaHuman aspartoacylase
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Model of aspartoacylase, a human enzyme involved in brain metabolism. Center for Eukaryotic Structural Genomics, PSI View MediaOptic nerve astrocytes
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Astrocytes in the cross section of a human optic nerve head Tom Deerinck and Keunyoung (“Christine”) Kim, NCMIR View MediaActin filaments bundled around the dynamin helical polymer
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Multiple actin filaments (magenta) are organized around a dynamin helical polymer (rainbow colored) in this model derived from cryo-electron tomography. Elizabeth Chen, University of Texas Southwestern Medical Center. View Media