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.

Immunoglobulin G (IgG)

Trypsin

Z-DNA

Carboxypeptidase A

Aspartate Transcarbamoylase (ATCase)

DPG-Hemoglobin Complex

Hemoglobin (1000)

Lysozyme (512)

Cytochrome c (unbound)

Intermolecular Contacts in Hemoglobin S

Hemoglobin S

Oxyhemoglobin

Induced Lac Repressor

Collagen

Deoxyhemoglobin

Ribonuclease S

Cytochrome c

Lysozyme (488)

Myohemerythrin

Hemoglobin

B-DNA

Crambin

DNA

Myoglobin

Deoxyribonucleic Acid (DNA)

TATA-Binding Protein (TBP)

Myoglobin Fold

A-DNA

Tomato Bushy Stunt Virus (TBSV)

Transfer Ribonucleic Acid (tRNA)

Lac Repressor

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

Blood

SARS-CoV-2 Fusion

Phage-based COVID-19 Vaccine

Myoglobin in a Whale Muscle Cell

Lipid Droplets

Influenza Virus

Biosites: Nucleus

RecA and DNA

SARS-CoV-2 and Neutralizing Antibodies

Model of a Mycoplasma Cell

CytoSkeleton

Measles Virus Proteins

HIV-Infected Cell

Myelin

Biosites: Red Blood Cell

Biosites: Cytoplasm

Chloroplast

Biosites: Blood Plasma

Abiogenesis

Biosites: Muscle

Last Universal Common Ancestor

Autophagy

Poliovirus Neutralization

Ebola Virus

Kinetochore

Mycoplasma mycoides

SARS-CoV-2 mRNA Vaccine

Transfer RNA and Gag Protein

Red Blood Cell Cytoskeleton

Bacteriophage T4 Infection

Coronavirus

Coronavirus Life Cycle

Respiratory Droplet

Biosites: Basement Membrane

Vascular Endothelial Growth Factor (VegF) Signaling

Casein Micelle and Fat Globule in Milk

Zika Virus

Escherichia coli Bacterium

Insulin Release

HIV in Blood Plasma

Immunological Synapse

Caulobacter Polar Microdomain

Cellulose Synthase

Escherichia coli

Collagen and Extracellular Matrix

HIV Vaccine

Insulin Action

Influenza Vaccine

Excitatory and Inhibitory Synapses

JCVI-syn3A Minimal Cell