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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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.

Myoglobin Fold

Tomato Bushy Stunt Virus (TBSV)

Carboxypeptidase A

DNA

Lysozyme (488)

DPG-Hemoglobin Complex

Hemoglobin

Lysozyme (512)

Deoxyribonucleic Acid (DNA)

Immunoglobulin G (IgG)

Lac Repressor

B-DNA

Aspartate Transcarbamoylase (ATCase)

Collagen

A-DNA

Cytochrome c (unbound)

TATA-Binding Protein (TBP)

Induced Lac Repressor

Oxyhemoglobin

Deoxyhemoglobin

Myoglobin

Cytochrome c

Hemoglobin S

Myohemerythrin

Z-DNA

Crambin

Transfer Ribonucleic Acid (tRNA)

Intermolecular Contacts in Hemoglobin S

Hemoglobin (1000)

Ribonuclease S

Trypsin

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

Casein Micelle and Fat Globule in Milk

HIV Vaccine

Abiogenesis

RecA and DNA

Last Universal Common Ancestor

Escherichia coli Bacterium

Ebola Virus

Chloroplast

Biosites: Red Blood Cell

Poliovirus Neutralization

SARS-CoV-2 and Neutralizing Antibodies

Blood

Mycoplasma mycoides

Lipid Droplets

Autophagy

Biosites: Muscle

Influenza Vaccine

Phage-based COVID-19 Vaccine

Red Blood Cell Cytoskeleton

Collagen and Extracellular Matrix

Escherichia coli

Kinetochore

Coronavirus Life Cycle

Myelin

HIV in Blood Plasma

Biosites: Basement Membrane

Biosites: Nucleus

JCVI-syn3A Minimal Cell

Insulin Action

Excitatory and Inhibitory Synapses

Caulobacter Polar Microdomain

Insulin Release

Zika Virus

Vascular Endothelial Growth Factor (VegF) Signaling

Transfer RNA and Gag Protein

SARS-CoV-2 Fusion

HIV-Infected Cell

Model of a Mycoplasma Cell

Bacteriophage T4 Infection

Immunological Synapse

Myoglobin in a Whale Muscle Cell

Measles Virus Proteins

Respiratory Droplet

CytoSkeleton

Biosites: Blood Plasma

Coronavirus

Biosites: Cytoplasm

SARS-CoV-2 mRNA Vaccine

Influenza Virus

Cellulose Synthase