Molecule of the Month
August 2022

Secretory Antibodies

Secretory immunoglobulins are our most abundant antibodies, providing a first line of defense against pathogens.


3D View:  6UE7




Health Focus: Cancer Biology and Therapeutics

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!

Winner, First Place Winner, Second Winner, Third Winner, Viewers Choice

Stuyvesant High School Team
New York, NY

South Brunswick High School Team
South Brunswick, NJ

Jericho High School Team
Jericho, NY

Riverdale Country School Team
New York, NY

Learn: Materials for Exploration
PDB-101 resources and 3D structures of COVID-19 proteins.
Teach: Curricula
The RCSB PDB Curricula provide authentic, hands-on teaching materials, individual and group activities and assessment suggestions.
Education Corner: Using PDB Resources
Bound! New Protein-Drug Matching Card Game from CCDC and PDB-101
SciArt Galleries
Irving Geis (1908-1997) was a gifted artist who helped illuminate the field of structural biology with his iconic images. The Geis Digital Archive features many of his illustrations in the context of their molecular structures.

Images used with permission from the Howard Hughes Medical Institute ( All rights reserved.

Myoglobin Fold

Tomato Bushy Stunt Virus (TBSV)

Carboxypeptidase A

Lac Repressor

Immunoglobulin G (IgG)


Cytochrome c

Intermolecular Contacts in Hemoglobin S

Ribonuclease S

Deoxyribonucleic Acid (DNA)


Induced Lac Repressor



TATA-Binding Protein (TBP)



Hemoglobin S

Hemoglobin (1000)

Transfer Ribonucleic Acid (tRNA)


DPG-Hemoglobin Complex




Lysozyme (512)


Lysozyme (488)

Aspartate Transcarbamoylase (ATCase)


Cytochrome c (unbound)

The Molecular Landscapes by David S. Goodsell integrate information from structural biology, microscopy and biophysics to simulate detailed views of the molecular structure of living cells.

Illustrations are free for use under a CC-BY-4.0 license

Model of a Mycoplasma Cell


Last Universal Common Ancestor

Biosites: Red Blood Cell

SARS-CoV-2 Fusion


Biosites: Basement Membrane


Vascular Endothelial Growth Factor (VegF) Signaling

Red Blood Cell Cytoskeleton

Cellulose Synthase

Escherichia coli

Insulin Action

Biosites: Cytoplasm

SARS-CoV-2 mRNA Vaccine

Biosites: Muscle

Poliovirus Neutralization


JCVI-syn3A Minimal Cell

Lipid Droplets

Respiratory Droplet


Biosites: Nucleus

HIV in Blood Plasma

Excitatory and Inhibitory Synapses

Zika Virus

Coronavirus Life Cycle

Myoglobin in a Whale Muscle Cell

Ebola Virus

RecA and DNA

Biosites: Blood Plasma

HIV Vaccine

SARS-CoV-2 and Neutralizing Antibodies

Collagen and Extracellular Matrix

Escherichia coli Bacterium

Casein Micelle and Fat Globule in Milk

Transfer RNA and Gag Protein



Mycoplasma mycoides

Influenza Vaccine

Measles Virus Proteins

Insulin Release

Immunological Synapse

Phage-based COVID-19 Vaccine