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.

DNA

Deoxyhemoglobin

Lysozyme (488)

Lysozyme (512)

Myohemerythrin

Trypsin

Intermolecular Contacts in Hemoglobin S

Hemoglobin (1000)

Ribonuclease S

TATA-Binding Protein (TBP)

B-DNA

DPG-Hemoglobin Complex

Crambin

Aspartate Transcarbamoylase (ATCase)

Cytochrome c (unbound)

Myoglobin

Collagen

Hemoglobin S

Transfer Ribonucleic Acid (tRNA)

Myoglobin Fold

Carboxypeptidase A

Induced Lac Repressor

Deoxyribonucleic Acid (DNA)

Lac Repressor

Oxyhemoglobin

Z-DNA

Tomato Bushy Stunt Virus (TBSV)

Immunoglobulin G (IgG)

Cytochrome c

Hemoglobin

A-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

Excitatory and Inhibitory Synapses

JCVI-syn3A Minimal Cell

Biosites: Red Blood Cell

Bacteriophage T4 Infection

Biosites: Cytoplasm

Coronavirus Life Cycle

Phage-based COVID-19 Vaccine

Lipid Droplets

Escherichia coli Bacterium

SARS-CoV-2 Fusion

Immunological Synapse

Kinetochore

Biosites: Blood Plasma

RecA and DNA

Collagen and Extracellular Matrix

HIV-Infected Cell

Myelin

Myoglobin in a Whale Muscle Cell

Caulobacter Polar Microdomain

Last Universal Common Ancestor

Blood

Red Blood Cell Cytoskeleton

Insulin Action

Influenza Virus

Insulin Release

Biosites: Nucleus

Zika Virus

CytoSkeleton

Mycoplasma mycoides

Biosites: Basement Membrane

Model of a Mycoplasma Cell

Biosites: Muscle

Casein Micelle and Fat Globule in Milk

Escherichia coli

Abiogenesis

Measles Virus Proteins

Vascular Endothelial Growth Factor (VegF) Signaling

Autophagy

Influenza Vaccine

Transfer RNA and Gag Protein

Ebola Virus

SARS-CoV-2 and Neutralizing Antibodies

Respiratory Droplet

Chloroplast

Poliovirus Neutralization

HIV in Blood Plasma

Coronavirus

SARS-CoV-2 mRNA Vaccine

Cellulose Synthase

HIV Vaccine