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.

Hemoglobin S

Immunoglobulin G (IgG)

DNA

B-DNA

Myoglobin

Transfer Ribonucleic Acid (tRNA)

Z-DNA

Trypsin

Aspartate Transcarbamoylase (ATCase)

Myoglobin Fold

Lac Repressor

DPG-Hemoglobin Complex

Intermolecular Contacts in Hemoglobin S

Crambin

Oxyhemoglobin

Hemoglobin

Myohemerythrin

Carboxypeptidase A

Cytochrome c

Lysozyme (488)

Ribonuclease S

Lysozyme (512)

Collagen

TATA-Binding Protein (TBP)

Induced Lac Repressor

A-DNA

Cytochrome c (unbound)

Deoxyhemoglobin

Deoxyribonucleic Acid (DNA)

Tomato Bushy Stunt Virus (TBSV)

Hemoglobin (1000)

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

Influenza Vaccine

Model of a Mycoplasma Cell

HIV in Blood Plasma

Vascular Endothelial Growth Factor (VegF) Signaling

Biosites: Blood Plasma

Caulobacter Polar Microdomain

JCVI-syn3A Minimal Cell

Influenza Virus

Autophagy

Biosites: Basement Membrane

Chloroplast

Zika Virus

Cellulose Synthase

Coronavirus

CytoSkeleton

Blood

Collagen and Extracellular Matrix

RecA and DNA

Myelin

Escherichia coli

Lipid Droplets

Last Universal Common Ancestor

Red Blood Cell Cytoskeleton

SARS-CoV-2 and Neutralizing Antibodies

Phage-based COVID-19 Vaccine

Measles Virus Proteins

Biosites: Cytoplasm

SARS-CoV-2 mRNA Vaccine

Transfer RNA and Gag Protein

Escherichia coli Bacterium

Coronavirus Life Cycle

Ebola Virus

Bacteriophage T4 Infection

Kinetochore

Abiogenesis

HIV-Infected Cell

Poliovirus Neutralization

Biosites: Muscle

Insulin Action

Casein Micelle and Fat Globule in Milk

Insulin Release

SARS-CoV-2 Fusion

Respiratory Droplet

Immunological Synapse

HIV Vaccine

Myoglobin in a Whale Muscle Cell

Biosites: Red Blood Cell

Mycoplasma mycoides

Biosites: Nucleus