Molecule of the Month
November 2021

Acetohydroxyacid Synthase

In plants, AHAS performs the first step in synthesis of three essential amino acids, making it an effective target for herbicides.


3D View:  6VZ8




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

RCSB PDB invites all high school students to tell a two-minute story that combines structural Biology and Public Health. Videos can be submited between January 18 and April 25, 2022.

Quick Links

The Challenge | Learn | Participate | Resources | Rules

2022 Video Challenge key visual: synaptic region with one fused vesicle
Celebrating 50 Years of Protein Data Bank
Celebrating 50 Years of Protein Data Bank

In 1971, the structural biology community established the single worldwide archive for macromolecular structure data–-the Protein Data Bank (PDB). In 2021, RCSB PDB and wwPDB are celebrating the 50th Anniversary of the PDB with symposia, materials, and more.

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
The SARS-CoV-2 Virion: Magnifying the Miniscule with Models of Digital, Plastic, and Paper by Samuel A. McKie, Chapel Prints Co
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.

Transfer Ribonucleic Acid (tRNA)


Lysozyme (512)

Hemoglobin (1000)


Cytochrome c (unbound)


Carboxypeptidase A



TATA-Binding Protein (TBP)


Induced Lac Repressor


DPG-Hemoglobin Complex

Hemoglobin S

Ribonuclease S

Tomato Bushy Stunt Virus (TBSV)

Intermolecular Contacts in Hemoglobin S

Myoglobin Fold


Immunoglobulin G (IgG)

Deoxyribonucleic Acid (DNA)




Lac Repressor

Cytochrome c

Lysozyme (488)


Aspartate Transcarbamoylase (ATCase)

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

RecA and DNA

Biosites: Cytoplasm

Lipid Droplets

SARS-CoV-2 Fusion


Myoglobin in a Whale Muscle Cell


Biosites: Muscle

Collagen and Extracellular Matrix

Transfer RNA and Gag Protein

Ebola Virus

Escherichia coli


Last Universal Common Ancestor

Mycoplasma mycoides

Coronavirus Life Cycle


SARS-CoV-2 mRNA Vaccine

HIV in Blood Plasma


Respiratory Droplet

Biosites: Red Blood Cell

Insulin Action



Influenza Vaccine

Poliovirus Neutralization

SARS-CoV-2 and Neutralizing Antibodies

Zika Virus

Excitatory and Inhibitory Synapses

Biosites: Nucleus

Escherichia coli Bacterium

Cellulose Synthase

Biosites: Blood Plasma

Red Blood Cell Cytoskeleton

Biosites: Basement Membrane

Measles Virus Proteins

Immunological Synapse