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)

Lysozyme (512)

DPG-Hemoglobin Complex

Hemoglobin (1000)

Hemoglobin

Collagen

Z-DNA

Trypsin

TATA-Binding Protein (TBP)

Induced Lac Repressor

Oxyhemoglobin

Lac Repressor

Tomato Bushy Stunt Virus (TBSV)

Crambin

Intermolecular Contacts in Hemoglobin S

Myoglobin

Cytochrome c (unbound)

Aspartate Transcarbamoylase (ATCase)

A-DNA

DNA

Carboxypeptidase A

Myohemerythrin

Myoglobin Fold

Ribonuclease S

B-DNA

Deoxyhemoglobin

Cytochrome c

Deoxyribonucleic Acid (DNA)

Hemoglobin S

Lysozyme (488)

Immunoglobulin G (IgG)

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

Biosites: Blood Plasma

SARS-CoV-2 and Neutralizing Antibodies

Coronavirus Life Cycle

SARS-CoV-2 mRNA Vaccine

Measles Virus Proteins

Chloroplast

Casein Micelle and Fat Globule in Milk

Myoglobin in a Whale Muscle Cell

CytoSkeleton

Autophagy

Transfer RNA and Gag Protein

Biosites: Muscle

Escherichia coli Bacterium

Immunological Synapse

Influenza Vaccine

Lipid Droplets

Collagen and Extracellular Matrix

Kinetochore

Mycoplasma mycoides

Cellulose Synthase

HIV-Infected Cell

Respiratory Droplet

Phage-based COVID-19 Vaccine

Poliovirus Neutralization

Abiogenesis

Biosites: Basement Membrane

Insulin Action

Excitatory and Inhibitory Synapses

Biosites: Nucleus

Caulobacter Polar Microdomain

Escherichia coli

Vascular Endothelial Growth Factor (VegF) Signaling

Myelin

HIV in Blood Plasma

Influenza Virus

Insulin Release

HIV Vaccine

RecA and DNA

Zika Virus

Biosites: Red Blood Cell

Biosites: Cytoplasm

SARS-CoV-2 Fusion

Ebola Virus

Model of a Mycoplasma Cell

Red Blood Cell Cytoskeleton

JCVI-syn3A Minimal Cell

Coronavirus

Last Universal Common Ancestor

Bacteriophage T4 Infection

Blood