Secretory Antibodies
Secretory immunoglobulins are our most abundant antibodies, providing a first line of defense against pathogens.
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Cells in our bodies are carefully regulated so that they divide, grow, and die according to the best plan for keeping us alive. When they lose these controls, they can grow into deadly cancers. Atomic structures have revealed how cell growth is normally controlled, and how cancer cells circumvent these essential controls. Explore PDB-101 Resources to learn about proteins related to cancer biology and therapeutics.
2022 Video Challenge for High School Students Molecular Mechanisms of Cancer Thanks to all challenge participants, expert judges, teachers, parents, and voters who made this competition happen. Congratulations to the 2022 Winners!
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Images used with permission from the Howard Hughes Medical Institute (www.hhmi.org). All rights reserved.

Ribonuclease S

Trypsin

DNA

Oxyhemoglobin

Induced Lac Repressor

B-DNA

TATA-Binding Protein (TBP)

Myoglobin Fold

Hemoglobin S

Myohemerythrin

Cytochrome c

Crambin

Deoxyhemoglobin

Collagen

Deoxyribonucleic Acid (DNA)

Tomato Bushy Stunt Virus (TBSV)

Carboxypeptidase A

Cytochrome c (unbound)

Lysozyme (512)

DPG-Hemoglobin Complex

Lac Repressor

Z-DNA

Intermolecular Contacts in Hemoglobin S

Myoglobin

Transfer Ribonucleic Acid (tRNA)

Immunoglobulin G (IgG)

A-DNA

Hemoglobin

Aspartate Transcarbamoylase (ATCase)

Lysozyme (488)

Hemoglobin (1000)
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SARS-CoV-2 Fusion

Chloroplast

Autophagy

Ebola Virus

Insulin Action

Influenza Vaccine

Myelin

Biosites: Muscle

Biosites: Cytoplasm

Lipid Droplets

Casein Micelle and Fat Globule in Milk

Coronavirus Life Cycle

Myoglobin in a Whale Muscle Cell

HIV in Blood Plasma

CytoSkeleton

Biosites: Nucleus

Poliovirus Neutralization

Coronavirus

Biosites: Red Blood Cell

Vascular Endothelial Growth Factor (VegF) Signaling

Measles Virus Proteins

Escherichia coli

Mycoplasma mycoides

Last Universal Common Ancestor

Transfer RNA and Gag Protein

Immunological Synapse

RecA and DNA

Model of a Mycoplasma Cell

SARS-CoV-2 and Neutralizing Antibodies

Biosites: Blood Plasma

SARS-CoV-2 mRNA Vaccine

Cellulose Synthase

Blood

Red Blood Cell Cytoskeleton

Collagen and Extracellular Matrix

JCVI-syn3A Minimal Cell

Abiogenesis

Excitatory and Inhibitory Synapses

Biosites: Basement Membrane

Escherichia coli Bacterium

Zika Virus

Respiratory Droplet