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

A-DNA

Myoglobin Fold

Tomato Bushy Stunt Virus (TBSV)

Myohemerythrin

Aspartate Transcarbamoylase (ATCase)

Induced Lac Repressor

Intermolecular Contacts in Hemoglobin S

Carboxypeptidase A

DPG-Hemoglobin Complex

Lac Repressor

TATA-Binding Protein (TBP)

Lysozyme (512)

DNA

Deoxyribonucleic Acid (DNA)

Hemoglobin S

Deoxyhemoglobin

Hemoglobin (1000)

Crambin

Transfer Ribonucleic Acid (tRNA)

B-DNA

Myoglobin

Oxyhemoglobin

Immunoglobulin G (IgG)

Collagen

Cytochrome c (unbound)

Trypsin

Lysozyme (488)

Hemoglobin

Cytochrome c

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

Zika Virus

CytoSkeleton

Vascular Endothelial Growth Factor (VegF) Signaling

Biosites: Muscle

Respiratory Droplet

Immunological Synapse

Escherichia coli

Biosites: Red Blood Cell

Model of a Mycoplasma Cell

Red Blood Cell Cytoskeleton

Caulobacter Polar Microdomain

RecA and DNA

Poliovirus Neutralization

SARS-CoV-2 mRNA Vaccine

Transfer RNA and Gag Protein

Lipid Droplets

HIV-Infected Cell

SARS-CoV-2 Fusion

Blood

Biosites: Cytoplasm

HIV Vaccine

Chloroplast

HIV in Blood Plasma

Escherichia coli Bacterium

Casein Micelle and Fat Globule in Milk

Ebola Virus

Autophagy

Insulin Action

Biosites: Nucleus

JCVI-syn3A Minimal Cell

Collagen and Extracellular Matrix

Biosites: Blood Plasma

Biosites: Basement Membrane

Insulin Release

Phage-based COVID-19 Vaccine

Influenza Virus

Coronavirus

Mycoplasma mycoides

Myelin

Kinetochore

Abiogenesis

Influenza Vaccine

Bacteriophage T4 Infection

Coronavirus Life Cycle

SARS-CoV-2 and Neutralizing Antibodies

Myoglobin in a Whale Muscle Cell

Excitatory and Inhibitory Synapses

Cellulose Synthase

Measles Virus Proteins

Last Universal Common Ancestor