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.

Myohemerythrin

Crambin

Lysozyme (488)

Transfer Ribonucleic Acid (tRNA)

Z-DNA

A-DNA

Trypsin

Aspartate Transcarbamoylase (ATCase)

Myoglobin

Immunoglobulin G (IgG)

DNA

Cytochrome c (unbound)

Ribonuclease S

Tomato Bushy Stunt Virus (TBSV)

DPG-Hemoglobin Complex

Deoxyhemoglobin

Hemoglobin

Cytochrome c

Carboxypeptidase A

TATA-Binding Protein (TBP)

Intermolecular Contacts in Hemoglobin S

Oxyhemoglobin

Myoglobin Fold

Lysozyme (512)

Hemoglobin S

Collagen

Deoxyribonucleic Acid (DNA)

Hemoglobin (1000)

Lac Repressor

Induced Lac Repressor

B-DNA

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

Influenza Virus

Myoglobin in a Whale Muscle Cell

RecA and DNA

Biosites: Nucleus

Poliovirus Neutralization

Excitatory and Inhibitory Synapses

Bacteriophage T4 Infection

Casein Micelle and Fat Globule in Milk

JCVI-syn3A Minimal Cell

Biosites: Cytoplasm

Insulin Action

Transfer RNA and Gag Protein

Red Blood Cell Cytoskeleton

Escherichia coli

HIV Vaccine

HIV in Blood Plasma

Kinetochore

Blood

Immunological Synapse

Coronavirus

Model of a Mycoplasma Cell

Biosites: Basement Membrane

Last Universal Common Ancestor

Mycoplasma mycoides

SARS-CoV-2 and Neutralizing Antibodies

Biosites: Muscle

Lipid Droplets

Caulobacter Polar Microdomain

Autophagy

Myelin

CytoSkeleton

Phage-based COVID-19 Vaccine

Escherichia coli Bacterium

Respiratory Droplet

Collagen and Extracellular Matrix

SARS-CoV-2 Fusion

Coronavirus Life Cycle

Cellulose Synthase

Biosites: Blood Plasma

Abiogenesis

Measles Virus Proteins

HIV-Infected Cell

Chloroplast

Influenza Vaccine

Insulin Release

Biosites: Red Blood Cell

Vascular Endothelial Growth Factor (VegF) Signaling

Zika Virus

SARS-CoV-2 mRNA Vaccine

Ebola Virus