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.

Lac Repressor

Deoxyhemoglobin

Trypsin

Aspartate Transcarbamoylase (ATCase)

Myoglobin Fold

Immunoglobulin G (IgG)

Lysozyme (512)

Carboxypeptidase A

Myohemerythrin

Intermolecular Contacts in Hemoglobin S

Cytochrome c (unbound)

Deoxyribonucleic Acid (DNA)

Hemoglobin S

Hemoglobin (1000)

DPG-Hemoglobin Complex

DNA

Oxyhemoglobin

Hemoglobin

TATA-Binding Protein (TBP)

B-DNA

Tomato Bushy Stunt Virus (TBSV)

Z-DNA

Crambin

Lysozyme (488)

A-DNA

Myoglobin

Collagen

Transfer Ribonucleic Acid (tRNA)

Cytochrome c

Induced Lac Repressor

Ribonuclease S

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

HIV Vaccine

Biosites: Red Blood Cell

Caulobacter Polar Microdomain

RecA and DNA

Poliovirus Neutralization

Kinetochore

HIV in Blood Plasma

Vascular Endothelial Growth Factor (VegF) Signaling

Myelin

Escherichia coli

Bacteriophage T4 Infection

Biosites: Muscle

HIV-Infected Cell

Red Blood Cell Cytoskeleton

Influenza Virus

Respiratory Droplet

Zika Virus

Blood

Last Universal Common Ancestor

Chloroplast

Coronavirus Life Cycle

Ebola Virus

Biosites: Basement Membrane

Myoglobin in a Whale Muscle Cell

Measles Virus Proteins

Lipid Droplets

Cellulose Synthase

JCVI-syn3A Minimal Cell

Escherichia coli Bacterium

SARS-CoV-2 Fusion

SARS-CoV-2 mRNA Vaccine

Casein Micelle and Fat Globule in Milk

Insulin Release

Biosites: Blood Plasma

Model of a Mycoplasma Cell

Immunological Synapse

Biosites: Nucleus

SARS-CoV-2 and Neutralizing Antibodies

Autophagy

Transfer RNA and Gag Protein

Phage-based COVID-19 Vaccine

CytoSkeleton

Excitatory and Inhibitory Synapses

Abiogenesis

Biosites: Cytoplasm

Coronavirus

Mycoplasma mycoides

Influenza Vaccine

Insulin Action

Collagen and Extracellular Matrix