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.

A-DNA

Hemoglobin

Myohemerythrin

TATA-Binding Protein (TBP)

DPG-Hemoglobin Complex

Lysozyme (488)

Cytochrome c

Crambin

Myoglobin Fold

B-DNA

Trypsin

Carboxypeptidase A

Deoxyribonucleic Acid (DNA)

Deoxyhemoglobin

Z-DNA

Hemoglobin (1000)

Intermolecular Contacts in Hemoglobin S

Collagen

Lysozyme (512)

Oxyhemoglobin

Cytochrome c (unbound)

Aspartate Transcarbamoylase (ATCase)

DNA

Induced Lac Repressor

Tomato Bushy Stunt Virus (TBSV)

Hemoglobin S

Ribonuclease S

Immunoglobulin G (IgG)

Myoglobin

Transfer Ribonucleic Acid (tRNA)

Lac Repressor

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

Phage-based COVID-19 Vaccine

HIV-Infected Cell

SARS-CoV-2 mRNA Vaccine

Respiratory Droplet

Cellulose Synthase

Myoglobin in a Whale Muscle Cell

Coronavirus Life Cycle

Biosites: Red Blood Cell

Biosites: Basement Membrane

Lipid Droplets

Casein Micelle and Fat Globule in Milk

Insulin Release

Influenza Vaccine

Chloroplast

Abiogenesis

Zika Virus

SARS-CoV-2 and Neutralizing Antibodies

Influenza Virus

Myelin

Escherichia coli

Coronavirus

Biosites: Cytoplasm

Mycoplasma mycoides

Caulobacter Polar Microdomain

Biosites: Blood Plasma

Excitatory and Inhibitory Synapses

Bacteriophage T4 Infection

Poliovirus Neutralization

Ebola Virus

Measles Virus Proteins

Escherichia coli Bacterium

SARS-CoV-2 Fusion

HIV in Blood Plasma

Red Blood Cell Cytoskeleton

Vascular Endothelial Growth Factor (VegF) Signaling

Biosites: Muscle

Transfer RNA and Gag Protein

Biosites: Nucleus

Immunological Synapse

Insulin Action

JCVI-syn3A Minimal Cell

Blood

Last Universal Common Ancestor

Kinetochore

RecA and DNA

HIV Vaccine

Collagen and Extracellular Matrix

CytoSkeleton

Autophagy

Model of a Mycoplasma Cell