Molecule of the Month
September 2026

Biofilms

Bacterial communities glued together and protected by biological polymers

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PDB data help explain fundamental biology, biomedicine, bioengineering/biotechnology, and energy sciences
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Use PDB-101 resources to learn how researchers are using biology in industry
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The RCSB PDB Curricula provide authentic, hands-on teaching materials, individual and group activities and assessment suggestions
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 (www.hhmi.org). All rights reserved.

Z-DNA

Myoglobin Fold

TATA-Binding Protein (TBP)

DNA

Aspartate Transcarbamoylase (ATCase)

Hemoglobin S

Myoglobin

Ribonuclease S

Intermolecular Contacts in Hemoglobin S

Deoxyhemoglobin

Cytochrome c

Trypsin

Transfer Ribonucleic Acid (tRNA)

Immunoglobulin G (IgG)

Oxyhemoglobin

B-DNA

Carboxypeptidase A

Collagen

Myohemerythrin

A-DNA

Cytochrome c (unbound)

Lysozyme (488)

Hemoglobin

Crambin

Induced Lac Repressor

Lysozyme (512)

Hemoglobin (1000)

Lac Repressor

DPG-Hemoglobin Complex

Tomato Bushy Stunt Virus (TBSV)

Deoxyribonucleic Acid (DNA)

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

Blood

Immunological Synapse

Insulin Release

Caulobacter Polar Microdomain

Poliovirus Neutralization

Coronavirus Life Cycle

Influenza Vaccine

Respiratory Droplet

Zika Virus

Autophagy

Biosites: Blood Plasma

Vascular Endothelial Growth Factor (VegF) Signaling

SARS-CoV-2 and Neutralizing Antibodies

Coronavirus

CytoSkeleton

RecA and DNA

Insulin Action

Red Blood Cell Cytoskeleton

Phage-based COVID-19 Vaccine

Bacteriophage T4 Infection

Biosites: Nucleus

Chloroplast

Escherichia coli Bacterium

Abiogenesis

Biosites: Muscle

HIV in Blood Plasma

Kinetochore

JCVI-syn3A Minimal Cell

Collagen and Extracellular Matrix

Ebola Virus

Influenza Virus

Biosites: Cytoplasm

Biosites: Basement Membrane

SARS-CoV-2 mRNA Vaccine

Myoglobin in a Whale Muscle Cell

HIV-Infected Cell

Measles Virus Proteins

Cellulose Synthase

Myelin

Excitatory and Inhibitory Synapses

Mycoplasma mycoides

Transfer RNA and Gag Protein

SARS-CoV-2 Fusion

Biosites: Red Blood Cell

Casein Micelle and Fat Globule in Milk

Escherichia coli

HIV Vaccine

Lipid Droplets

Last Universal Common Ancestor