Polypeptide Collection

DNA transcription, molecular model. Secondary structure of the enzyme RNA polymerase II synthesising a mRNA (messenger ribonucleic acid, lilac) strand from a DNA (deoxyribonucleic acid)

Myoglobin molecule C015 / 5702
Myoglobin molecule. Computer model showing the structure of a myoglobin molecule. Myoglobin is a protein found in muscle tissue

Parathyroid hormone molecule. Computer model showing the structure of parathyroid hormone (PTH), or parathormone. Atoms are colour-coded (carbon: dark grey, hydrogen: light grey, oxygen: red)

Tetraubiquitin protein molecule F006 / 9326
Tetraubiquitin protein, molecular model. Ubiquitin is found in all eukaryotic cells. When a protein is damaged or old it will be tagged by several ubiquitin molecules

Gramicidin antibiotic molecule C015 / 5072
Gramicidin. Molecular model of the antibiotic gramicidin D, from the bacterium Bacillus brevis. This antibiotic is effective against Gram positive and Gram negative bacteria

Gramicidin antibiotic molecule C015 / 5071
Gramicidin. Molecular model of the antibiotic gramicidin D, from the bacterium Bacillus brevis. This antibiotic is effective against Gram positive and Gram negative bacteria

Myoglobin protein, molecular model C016 / 6575
Myoglobin protein. Molecular model showing the structure of the myoglobin protein. Myoglobin is a protein found in muscle tissue

Vasopressin hormone crystals, LM C016 / 8551
Vasopressin hormone crystals, light micrograph taken with polarised light. Vasopressin is a neurohypophysial hormone found in most mammals

Myoglobin molecule C015 / 5701
Myoglobin molecule. Computer model showing the structure of a myoglobin molecule. Myoglobin is a protein found in muscle tissue

Myoglobin molecule C015 / 5164
Myoglobin molecule. Computer model showing the structure of a myoglobin molecule. Myoglobin is a protein found in muscle tissue

Human growth hormone molecule C013 / 9006
Human growth hormone. Molecular model of human growth hormone (hGH, yellow) bound to the extracellular domain of the human growth hormone binding protein (hGHBP)

Glycated haemoglobin molecule C013 / 7781
Glycated haemoglobin molecule. Computer model of a glycated haemoglobin molecule. The alpha and beta subunits of the haemoglobin are blue and pink, and the iron-containing haem groups are grey

Glycated haemoglobin molecule C013 / 7779
Glycated haemoglobin molecule. Computer model showing a glucose molecule (centre) bound to a molecule of haemoglobin. The alpha and beta subunits of the haemoglobin are blue and pink

Glycated haemoglobin molecule C013 / 7780
Glycated haemoglobin molecule. Computer model showing a glucose molecule (centre) bound to a molecule of haemoglobin. The alpha and beta subunits of the haemoglobin are blue and pink

Haemoglobin molecule
Computer graphic representation of the haemoglobin molecule, the oxygen-carrying substance of human blood. The roughly tubular features (in orange and blue) are polypeptide (protein) chains

Computer graphics of haemoglobin molecule
Computer graphic representation of part of the haemoglobin molecule, the oxygen-carrying substance of human blood, showing its four polypeptide (protein) chains

Haemoglobin molecule, artwork
Haemoglobin molecule. Computer artwork showing the molecular structure of haemoglobin, a metalloprotein that transports oxygen around the body in red blood cells

Glycogen phosphorylase, molecular model. This is an enzyme involved in breaking down glycogen, the energy storage molecule involved in animal metabolism

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

Immunoglobulin pentamer, artwork
Immunoglobulin pentamer, computer artwork. Immunoglobulin (Ig) proteins, also known as antibodies, are gamma globulin proteins that are part of the mammalian immune system

Hantavirus inhibitor molecule. Molecular model of a pentapeptide protein that blocks the entry of hantavirus particles to human cells

Enkephalin crystals, light micrograph
Enkephalin crystals, polarised light micrograph. Enkephalin is an endorphin found in the human brain. There are two variants: Met-enkephalin (seen here), which contains the amino acid methionine

Insulin-like growth 1 factor molecule
Insulin-like growth factor 1 molecule. Computer model showing the structure of a molecule of the hormone insulin-like growth factor 1 (IGF-1)

Insulin-like growth 2 factor molecule
Insulin-like growth factor 2 molecule. Computer model showing the structure of a molecule of the hormone insulin-like growth factor 2 (IGF-2)

Corticotropin-releasing factor complex
Corticotropin-releasing factor (CRF) complex. Molecular model showing the structure of the human hormone and neurotransmitter CRF in complex with its receptor

Cytidine deaminase, molecular model
Cytidine deaminase. Computer model of the enzyme, activation-induced (cytidine) deaminase (AID). The tertiary structures of two protein complexes (purple and green)

Encephalin peptide
Encephalin. Computer molecular graphic of part of a molecule of encephalin, a polypeptide found in the human brain. It has a painkilling effect

Human growth hormone, molecular model
Human growth hormone. Molecular model showing the secondary structure of human growth hormone (hGH), a hormone produced in the anterior pituitary gland in the brain

Somatotropin hormone

Erythropoietin hormone
Erythropoietin. Computer model of a molecule of the hormone erythropoietin. This is a glycoprotein that consists of a single-chain polypeptide of 165 amino acids

Myoglobin protein
Myoglobin. Computer model of the protein myoglobin that contains the iron-containing haem group (not seen). Myoglobin consists of a chain of 153 amino acids folded into a globin molecule that has a

RNA-editing enzyme combined with RNA. Computer model showing the mRNA-editing enzyme, APOBEC-1 (apolipoprotein B mRNA editing enzyme, catalytic polypeptide 1)

Leptin molecule. Computer model of a molecule of leptin, a protein produced by white fat cells in adipose tissue. Leptin controls the amount of white adipose tissue that is laid down in the body

Collagen fibre, molecular model. Collagen is a long structural protein, which usually takes the form of a triple helix known as tropocollagen

Parathyroid hormone, molecular model
Parathyroid hormone. Molecular model showing the primary structure (spheres) and secondary structure (coils) of parathyroid hormone (PTH), or parathormone

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Polypeptide: The Building Blocks of Life From DNA transcription to molecular models, polypeptides play a crucial role in various biological processes. Enkephalin crystals, as seen under a light micrograph, demonstrate the intricate structure and beauty of these peptides. The human growth hormone molecule and parathyroid hormone molecule showcase the diversity of polypeptides found within our bodies. Their unique structures enable them to perform specific functions essential for growth and calcium regulation. Tetraubiquitin protein molecule F006/9326 and gramicidin antibiotic molecules C015/5072 & C015/5071 highlight the versatility of polypeptides beyond human physiology. These molecules exhibit their significance in cellular processes like protein degradation and antimicrobial defense. Myoglobin protein's molecular model (C016/6575) reveals its role in oxygen storage within muscle tissues. Its compact structure allows efficient binding and release of oxygen during physical activity. Vasopressin hormone crystals (LM C016/8551) provide insight into how they can form complex crystal structures with remarkable stability. These formations aid in hormonal signaling throughout the body. Lastly, haemoglobin molecules exemplify one of the most well-known applications of polypeptides - transporting oxygen through our bloodstream. Their repetitive subunits create an efficient carrier system that ensures vital oxygen reaches every cell in our body. From DNA transcription to crystal formation they can fundamental components shaping life at a molecular level. Understanding their diverse roles helps unravel the complexity behind biological processes while appreciating their aesthetic appeal under microscopic examination.