Molecule of the Month
June 2022

Pyruvate Kinase M2

Pyruvate kinases are the paradoxical gatekeepers for cancer cell metabolism and growth.


3D View:  4FXF




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
Python Scripting for Biochemistry & Molecular Biology by Jessica A. Nash (MolSSI) and Paul A. Craig (Rochester Institute of Technology)
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.



Hemoglobin S



Intermolecular Contacts in Hemoglobin S

Hemoglobin (1000)

Carboxypeptidase A


Tomato Bushy Stunt Virus (TBSV)

Induced Lac Repressor

Myoglobin Fold

TATA-Binding Protein (TBP)


Deoxyribonucleic Acid (DNA)

Lac Repressor


Lysozyme (512)


Cytochrome c


DPG-Hemoglobin Complex


Immunoglobulin G (IgG)

Aspartate Transcarbamoylase (ATCase)

Lysozyme (488)

Transfer Ribonucleic Acid (tRNA)


Ribonuclease S


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

Poliovirus Neutralization

Escherichia coli


Coronavirus Life Cycle

Influenza Vaccine

Casein Micelle and Fat Globule in Milk

Zika Virus


Last Universal Common Ancestor

Ebola Virus

Measles Virus Proteins

Escherichia coli Bacterium

Collagen and Extracellular Matrix

Biosites: Basement Membrane

Respiratory Droplet

SARS-CoV-2 mRNA Vaccine

HIV in Blood Plasma

Biosites: Red Blood Cell

Red Blood Cell Cytoskeleton

Lipid Droplets


Mycoplasma mycoides

Immunological Synapse

Model of a Mycoplasma Cell

Biosites: Cytoplasm


Excitatory and Inhibitory Synapses

Cellulose Synthase

SARS-CoV-2 Fusion


JCVI-syn3A Minimal Cell


SARS-CoV-2 and Neutralizing Antibodies

Insulin Action

Biosites: Blood Plasma

Biosites: Muscle


Biosites: Nucleus

Vascular Endothelial Growth Factor (VegF) Signaling

Transfer RNA and Gag Protein

RecA and DNA

Myoglobin in a Whale Muscle Cell