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.

Z-DNA

Hemoglobin (1000)

Intermolecular Contacts in Hemoglobin S

Lac Repressor

Oxyhemoglobin

Transfer Ribonucleic Acid (tRNA)

Tomato Bushy Stunt Virus (TBSV)

Myoglobin

Ribonuclease S

Aspartate Transcarbamoylase (ATCase)

Deoxyhemoglobin

Crambin

A-DNA

Cytochrome c

B-DNA

Cytochrome c (unbound)

DNA

Carboxypeptidase A

Myohemerythrin

Lysozyme (512)

Immunoglobulin G (IgG)

Lysozyme (488)

Hemoglobin

Collagen

Deoxyribonucleic Acid (DNA)

Trypsin

DPG-Hemoglobin Complex

Myoglobin Fold

Induced Lac Repressor

TATA-Binding Protein (TBP)

Hemoglobin 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 in Blood Plasma

Myoglobin in a Whale Muscle Cell

Chloroplast

Kinetochore

Model of a Mycoplasma Cell

Influenza Vaccine

Insulin Release

Insulin Action

Respiratory Droplet

Excitatory and Inhibitory Synapses

SARS-CoV-2 mRNA Vaccine

Poliovirus Neutralization

CytoSkeleton

Escherichia coli

Casein Micelle and Fat Globule in Milk

Autophagy

Vascular Endothelial Growth Factor (VegF) Signaling

Transfer RNA and Gag Protein

Biosites: Blood Plasma

Last Universal Common Ancestor

Red Blood Cell Cytoskeleton

HIV-Infected Cell

SARS-CoV-2 Fusion

Blood

Zika Virus

Abiogenesis

Biosites: Muscle

Escherichia coli Bacterium

Myelin

RecA and DNA

Bacteriophage T4 Infection

JCVI-syn3A Minimal Cell

SARS-CoV-2 and Neutralizing Antibodies

Lipid Droplets

Biosites: Red Blood Cell

Influenza Virus

Coronavirus

Caulobacter Polar Microdomain

Biosites: Basement Membrane

Immunological Synapse

Ebola Virus

HIV Vaccine

Mycoplasma mycoides

Measles Virus Proteins

Biosites: Nucleus

Collagen and Extracellular Matrix

Biosites: Cytoplasm

Coronavirus Life Cycle

Cellulose Synthase

Phage-based COVID-19 Vaccine