Secondary Structure Collection (page 4)

DNA loop, molecular model
DNA loop. Theoretical molecular model of a loop structure for DNA in its chromatin form. DNA (deoxyribonucleic acid) is a helical molecule (here the helix itself forms a circular loop)

Mouse chromatin protein, molecular model
Mouse chromatin protein. Molecular model of the structure of chromatin proteins found in mice. This is similar, but not identical, to the same proteins found in humans

RNA polymerase II molecule
RNA polymerase II. Computer model showing the secondary structure of the enzyme RNA polymerase II. The molecule comprises 12 subunits

Protein structure, artwork
Protein structure. Computer artwork of alpha helices (coils) and beta sheets (ribbons) of the secondary structure of a protein

Myoglobin molecule. Computer model showing the structure of a Myoglobin molecule. Myoglobin is a protein found in muscle tissue

PPAR regulatory molecule. Molecular model of peroxisome proliferator-activated receptor gamma (PPARG, pink) bound to a DNA (deoxyribonucleic acid) molecule (orange and green)

Antibiotic resistance enzyme molecule
Antibiotic resistance enzyme. Molecular model of the metallo-beta-lactamase protein fold, a part of metallo-beta-lactamase enzymes, in a bacterial cell

Photosystem I, molecular model
Photosystem I. Computer model showing the molecular structure of Photosystem I. Photosystems are protein enzyme complexes involved in photosynthesis

Viral DNA polymerase in complex with DNA. Computer model showing the active site of a phi29 DNA polymerase molecule (grey ribbons) in complex with DNA (deoxyribonucleic acid, yellow)

Tubulin dimer, molecular model
Tubulin. Molecular model of a tubulin dimer. The beta-tubulin subunit (gold) is at top and the alpha-tubulin subunit (green) is at bottom

Xanthine dehydrogenase molecule. Computer model showing the molecular structure of the Xanthine dehydrogenase (XDH) enzyme

Iron-hydrogenase molecule. Computer model showing the molecular structure of an iron-hydrogenase ([FE]-hydrogenase) enzyme from the Methanocaldococcus jannaschii archaeon

Fatty acid synthase in complex with NADP+. Computer model showing the molecular structure of fatty acid synthase (FAS) complexed with nicotinamide adenine dinucleotide phosphate (NADP+)

Feline distemper virus particle. Molecular model showing the structure of the capsid (outer protein coat) of a feline panleukopenia virus particle. This parovirus causes distemper in cats

Cholesterol producing enzyme and statin. Computer model showing the molecular structure of HMG-CoA reductase (HMGCR) in complex with Atorvastatin

Interferon gamma molecule and receptor
Interferon gamma. Molecular model showing the secondary structure of the interferon gamma dimer (bright pink and gold and pale pink and beige)

Tobacco mosaic virus, molecular model
Tobacco mosaic virus. Computer model showing the molecular structure of a tobacco mosaic virus (TMV) particle (virion). This plant virus is a tobamovirus, and has an RNA (ribonucleic acid) genome

Selenocysteine synthase enzyme molecule. Computer model showing the molecular structure of the enzyme selenocysteine synthase (SecS)

Lysyl oxidase enzyme molecule. Computer artwork showing the secondary structure of the enzyme lysyl oxidase (LOX). LOX is a homodimeric (composed of two identical subunits)

Major sperm protein molecule
Major sperm protein. Computer model showing the secondary structure of the peptide chains that make up major sperm protein (MSP)

Proteinase inhibitor molecule
Proteinase inhibitor. Molecular model showing the secondary structure of alpha-1 proteinase inhibitor, also known as alpha 1-antitrypsin

Leptin hormone molecule. Computer model showing the secondary structure of the hormone leptin. This hormone is produced by adipose (fat) tissue

Inhibin beta A molecule. Computer model showing the crystal structure of a molecule of the protein Inhibin beta A (INHBA)

Adiponectin hormone molecule. Molecular model showing the secondary structure of the human hormone adiponectin (Acrp30). Hydrogen bonding is shown by beta sheets (arrows) and random coils (wires)

Prolactin hormone molecule. Computer model showing the secondary structure of human prolactin (hPRL), or luteotropic hormone (LTH)

Thrombopoietin hormone molecule. Computer model showing the secondary structure of a molecule of the hormone thrombopoietin (TPO)

Follicle stimulating hormone molecules. Computer artwork showing the secondary structure of two strands of follicle stimulating hormone (FSH)

Pancreatic hormone molecule. Molecular model showing the secondary structure of the hormone known as pancreatic polypeptide (PP)

Orexin-A hormone molecule. Computer model showing the crystal structure of a molecule of the hormone orexin-A. The crystal structure consists of both the secondary structure

Renin and inhibitor complex. Computer model showing the secondary structure of the enzyme renin complexed with inhibitor 7

Orexin-B hormone molecule. Computer model showing the crystal structure of a molecule of the hormone orexin-B. The crystal structure consists of both the secondary structure

Relaxin hormone molecule. Computer model showing the secondary structure of a molecule of the hormone relaxin. The alpha helices (ribbons) of the secondary structure can be seen

Human chorionic gonadotrophin molecule. Computer model showing the crystal structure of a molecule of the hormone human chorionic gonadotrophin (hCG)

Somatotrophin hormone molecule. Computer model showing the secondary structure of the human growth hormone somatotrophin (GH)

Kinase molecule, secondary structure
Kinase molecule, computer model. Kinases are enzymes that catalyse the transfer of phosphate groups from a high-energy phosphate-containing molecule (such as ATP or ADP)

Caspase 3 molecule
Caspase-3 molecule. Computer artwork showing the secondary structure of a molecule of caspase-3. Caspase-3 is a protease, an enzyme that cleaves proteins

Caspase 1 molecule
Caspase-1 molecule. Computer artwork showing the secondary structure of a molecule of caspase-1. Caspase-1 is a protease, an enzyme that cleaves proteins

Lipase molecule, secondary structure
Lipase molecule, computer model. Lipase is an enzyme that breaks lipids (fats) into fatty acids and glycerol. Human pancreatic lipase is the main enzyme responsible for breaking down fat in the human

Cholinesterase enzyme. Molecular model of the secondary structure of butyrylcholinesterase (BChE), showing alpha helices (blue) and beta sheets (red and yellow)

Ferroxidase enzyme, molecular model
Ferroxidase enzyme. Molecular model showing two views of the secondary structure of the human enzyme ferroxidase, also known as ceruloplasmin. Copper atoms are represented as red spheres

Synthetic peptide fibre, molecular model
Synthetic peptide fibre. Molecular model of a synthetic collagen-like peptide fibre, showing three different ways of representing the structure. Peptides are small molecules formed from amino acids

Viral dUTPase enzyme, molecular model
dUTPase enzyme. Molecular model of the enzyme dUTP pyrophosphatase (dUTPase) from the feline immunodeficiency virus (FIV)

Cyclin-depenent kinase 5 molecule
Cyclin-dependent kinase 5. Molecular model showing the secondary structure of the enzyme cylcin- dependent kinase 5 (cdk5)

Hammerhead ribozyme molecule
Hammerhead ribozyme, molecular model. Ribozymes are RNA (ribonucleic acid) molecules that catalyse certain biochemical reactions

Liver proteins
C-reactive proteins, computer artwork. C-reactive proteins (CRPs) are produced by the liver during periods of acute inflammation

Protein from outer coat of SARS virus
SARS virus capsid protein, molecular model. This protein is responsible for binding the capsid (outer coat) of the SARS (severe acute respiratory syndrome)

Influenza A virus haemagglutinin protein
Haemagglutinin protein from the surface of Influenza A virus, molecular model. This protein, known as haemagglutinin, is found on the surface of the influenza A virus

Anthrax lethal factor protein
Anthrax lethal factor, molecular model. Lethal factor (LF) is one of the toxins produced by spores of the bacterium Bacillis anthracis

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Secondary structure refers to the intricate folding patterns that proteins and nucleic acids adopt, playing a crucial role in their functionality. In one captivating image, an anaesthetic inhibits an ion channel (C015/6718), highlighting how secondary structure impacts cellular processes. Another snapshot showcases DNA transcription, unveiling the molecular model of this essential process. Artwork depicting the secondary structure of proteins captivates our imagination as we marvel at the intricacy and beauty within each fold. The nucleosome molecule further emphasizes this complexity, showcasing how DNA wraps around histone proteins to form a compact structure. The bacterial ribosome stands tall as a testament to secondary structures' significance in protein synthesis. Meanwhile, the HIV reverse transcription enzyme reminds us of its vital role in converting viral RNA into DNA during infection. Molecular models provide insight into hepatitis C virus enzymes and interferon molecules—both critical players in disease progression and immune response modulation. Similarly, human growth hormone molecules hold immense importance for development and metabolism regulation. Exploring coagulation factor complex molecules (C014/0139) unravels mechanisms behind blood clotting—a process dependent on precise secondary structures working together seamlessly. Ghrelin hormone molecules intrigue us with their involvement in appetite regulation and energy balance maintenance. From anaesthetics influencing ion channels to hormones orchestrating bodily functions, understanding secondary structures unlocks countless mysteries within biological systems. These captivating images remind us of the intricate dance occurring at a microscopic level—the delicate folds dictating life's grand symphony.