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.

Transfer Ribonucleic Acid (tRNA)

Deoxyhemoglobin

Hemoglobin S

Myoglobin Fold

Carboxypeptidase A

Lac Repressor

DPG-Hemoglobin Complex

Lysozyme (512)

DNA

Ribonuclease S

Hemoglobin

Cytochrome c (unbound)

Tomato Bushy Stunt Virus (TBSV)

Intermolecular Contacts in Hemoglobin S

A-DNA

Myoglobin

Immunoglobulin G (IgG)

TATA-Binding Protein (TBP)

Crambin

Induced Lac Repressor

Deoxyribonucleic Acid (DNA)

Lysozyme (488)

Z-DNA

Collagen

Aspartate Transcarbamoylase (ATCase)

Trypsin

B-DNA

Hemoglobin (1000)

Myohemerythrin

Cytochrome c

Oxyhemoglobin

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

Measles Virus Proteins

Mycoplasma mycoides

Zika Virus

Kinetochore

Model of a Mycoplasma Cell

Biosites: Basement Membrane

Red Blood Cell Cytoskeleton

Biosites: Red Blood Cell

Immunological Synapse

Collagen and Extracellular Matrix

Vascular Endothelial Growth Factor (VegF) Signaling

Blood

Casein Micelle and Fat Globule in Milk

Poliovirus Neutralization

Respiratory Droplet

Escherichia coli

Escherichia coli Bacterium

SARS-CoV-2 Fusion

Insulin Release

Caulobacter Polar Microdomain

Influenza Virus

CytoSkeleton

Biosites: Cytoplasm

Myoglobin in a Whale Muscle Cell

Phage-based COVID-19 Vaccine

Biosites: Blood Plasma

Excitatory and Inhibitory Synapses

Influenza Vaccine

SARS-CoV-2 and Neutralizing Antibodies

Chloroplast

HIV in Blood Plasma

Insulin Action

Coronavirus

Coronavirus Life Cycle

Abiogenesis

Myelin

SARS-CoV-2 mRNA Vaccine

Last Universal Common Ancestor

JCVI-syn3A Minimal Cell

Ebola Virus

RecA and DNA

Bacteriophage T4 Infection

Biosites: Nucleus

Autophagy

HIV Vaccine

Cellulose Synthase

Biosites: Muscle

HIV-Infected Cell

Transfer RNA and Gag Protein

Lipid Droplets