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Ubiquitin-fold modifier 1 from C. elegans

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Solution NMR structure of protein target WR41 (left) from C. elegans. Northeast Structural Genomics Consortium View Media

HIV enzyme

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These images model the molecular structures of three enzymes with critical roles in the life cycle of the human immunodeficiency virus (HIV). Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Tiny strands of tubulin, a protein in a cell's skeleton

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Just as our bodies rely on bones for structural support, our cells rely on a cellular skeleton. Pakorn Kanchanawong, National University of Singapore and National Heart, Lung, and Blood Institute, National Institutes of Health; and Clare Waterman, National Heart, Lung, and Blood Institute, National Institutes of Health View Media

Kinases (with labels)

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Kinases are enzymes that add phosphate groups (red-yellow structures) to proteins (green), assigning the proteins a code. Crabtree + Company View Media

Partial Model of a Cilium’s Doublet Microtubule

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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 Media

Himastatin

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A model of the molecule himastatin, which was first isolated from the bacterium Streptomyces himastatinicus. Himastatin shows antibiotic activity. Mohammad Movassaghi, Massachusetts Institute of Technology. View Media

Molecular model of freshly made Rous sarcoma virus (RSV)

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Viruses have been the foes of animals and other organisms for time immemorial. Boon Chong Goh, University of Illinois at Urbana-Champaign View Media

Cryo-EM reveals how the HIV capsid attaches to a human protein to evade immune detection

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The illustration shows the capsid of human immunodeficiency virus (HIV) whose molecular features were resolved with cryo-electron microscopy (cryo-EM). Juan R. Perilla, University of Illinois at Urbana-Champaign View Media

Himastatin 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 Media

Hen 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 Media

Tex protein

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Model of a member from the Tex protein family, which is implicated in transcriptional regulation and highly conserved in eukaryotes and prokaryotes. New York Structural GenomiX Research Consortium, PSI View Media

Arachnoidiscus diatom

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An Arachnoidiscus diatom with a diameter of 190µm. Michael Shribak, Marine Biological Laboratory/University of Chicago. View Media

Shiga toxin being sorted inside a cell

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Shiga toxin (green) is sorted from the endosome into membrane tubules (red), which then pinch off and move to the Golgi apparatus. Somshuvra Mukhopadhyay, The University of Texas at Austin, and Adam D. Linstedt, Carnegie Mellon University View Media

Dense tubular matrices in the peripheral endoplasmic reticulum (ER) 2

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Three-dimensional reconstruction of a tubular matrix in a thin section of the peripheral endoplasmic reticulum between the plasma membranes of the cell. Jennifer Lippincott-Schwartz, Howard Hughes Medical Institute Janelia Research Campus, Virginia View Media

CCP enzyme

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The enzyme CCP is found in the mitochondria of baker’s yeast. Scientists study the chemical reactions that CCP triggers, which involve a water molecule, iron, and oxygen. Protein Data Bank. View Media

VDAC-1 (3)

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The structure of the pore-forming protein VDAC-1 from humans. Gerhard Wagner, Harvard Medical School View Media

Histones in chromatin

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Histone proteins loop together with double-stranded DNA to form a structure that resembles beads on a string. Crabtree + Company View Media

Structure of heme, side view

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Molecular model of the struture of heme. Heme is a small, flat molecule with an iron ion (dark red) at its center. Rachel Kramer Green, RCSB Protein Data Bank View Media

Phenylalanine tRNA molecule

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Phenylalanine tRNA showing the anticodon (yellow) and the amino acid, phenylalanine (blue and red spheres). Patrick O'Donoghue and Dieter Soll, Yale University View Media

Himastatin, 360-degree view

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A 360-degree view of the molecule himastatin, which was first isolated from the bacterium Streptomyces himastatinicus. Himastatin shows antibiotic activity. Mohammad Movassaghi, Massachusetts Institute of Technology. View Media

Shiga 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 Media

Weblike sheath covering developing egg chambers in a giant grasshopper

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The lubber grasshopper, found throughout the southern United States, is frequently used in biology classes to teach students about the respiratory system of insects. Kevin Edwards, Johny Shajahan, and Doug Whitman, Illinois State University. View Media

dUTP pyrophosphatase from M. tuberculosis

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Model of an enzyme, dUTP pyrophosphatase, from Mycobacterium tuberculosis. Drugs targeted to this enzyme might inhibit the replication of the bacterium that causes most cases of tuberculosis. Mycobacterium Tuberculosis Center, PSI View Media

Building blocks and folding of proteins

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Proteins are made of amino acids hooked end-to-end like beads on a necklace. To become active, proteins must twist and fold into their final, or "native," conformation. Crabtree + Company View Media

CRISPR

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RNA incorporated into the CRISPR surveillance complex is positioned to scan across foreign DNA. Cryo-EM density from a 3Å reconstruction is shown as a yellow mesh. NRAMM National Resource for Automated Molecular Microscopy http://nramm.nysbc.org/nramm-images/ Source: Bridget Carragher View Media

PSI: from genes to structures

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The goal of the Protein Structure Initiative (PSI) is to determine the three-dimensional shapes of a wide range of proteins by solving the structures of representative members of each protein family f National Institute of General Medical Sciences View Media

Ribbon diagram of a cefotaxime-CCD-1 complex

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CCD-1 is an enzyme produced by the bacterium Clostridioides difficile that helps it resist antibiotics. Keith Hodgson, Stanford University. View Media

Kinesin moves cellular cargo

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A protein called kinesin (blue) is in charge of moving cargo around inside cells and helping them divide. Charles Sindelar, Yale University View Media

Dynamin Fission

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Time lapse series shows short dynamin assemblies (not visible) constricting a lipid tube to make a "beads on a string" appearance, then cutting off one of the beads i.e., catalyzing membrane fission). Ramachandran, Pucadyil et al. , The Scripps Research Institute View Media

Bacterial alpha amylase

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A crystal of bacterial alpha amylase protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media

DNase

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Crystals of DNase protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media

Structure of amyloid-forming prion protein

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This structure from an amyloid-forming prion protein shows one way beta sheets can stack. Douglas Fowler, University of Washington View Media

Plant resistosome

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The research organism Arabidopsis thaliana forms a large molecular machine called a resistosome to fight off infections. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Active Site of E. coli response regulator PhoB

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Active site of E. coli response regulator PhoB. Ann Stock, Rutgers University View Media

Heat 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 Media

Secreted protein from Mycobacteria

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Model of a major secreted protein of unknown function, which is only found in mycobacteria, the class of bacteria that causes tuberculosis. Mycobacterium Tuberculosis Center, PSI View Media

Beta 2-adrenergic receptor

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The receptor is shown bound to a partial inverse agonist, carazolol. Raymond Stevens, The Scripps Research Institute View Media

Oligoendopeptidase F from B. stearothermophilus

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Crystal structure of oligoendopeptidase F, a protein slicing enzyme from Bacillus stearothermophilus, a bacterium that can cause food products to spoil. Accelerated Technologies Center for Gene to 3D Structure/Midwest Center for Structural Genomics View Media

3D 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 Media

Actin 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

Bence Jones protein MLE

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A crystal of Bence Jones protein created for X-ray crystallography, which can reveal detailed, three-dimensional protein structures. Alex McPherson, University of California, Irvine View Media

Beta-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 Media

Precise development in the fruit fly embryo

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This 2-hour-old fly embryo already has a blueprint for its formation, and the process for following it is so precise that the difference of just a few key molecules can change the plans. Thomas Gregor, Princeton University View Media

Cytonemes in developing fruit fly cells

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Scientists have long known that multicellular organisms use biological molecules produced by one cell and sensed by another to transmit messages that, for instance, guide proper development of organs Sougata Roy, University of California, San Francisco View Media

Most 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 Media

SARS-CoV-2 nucleocapsid dimer

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In SARS-CoV-2, the virus that causes COVID-19, nucleocapsid is a complex molecule with many functional parts. Amy Wu and Christine Zardecki, RCSB Protein Data Bank. View Media

Coronavirus spike protein structure

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Coronaviruses are enveloped viruses responsible for 30 percent of mild respiratory infections and atypical deadly pneumonia in humans worldwide. Melody Campbell, UCSF View Media

Sortase 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 Media

Artificial cilia exhibit spontaneous beating

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Researchers have created artificial cilia that wave like the real thing. Zvonimir Dogic View Media

Bacteriophage P22 capsid, detail

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Detail of a subunit of the capsid, or outer cover, of bacteriophage P22, a virus that infects the Salmonella bacteria. Dr. Wah Chiu, Baylor College of Medicine View Media