Molecule of the Month
September 2026

Biofilms

Bacterial communities glued together and protected by biological polymers

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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.

Deoxyhemoglobin

Lysozyme (488)

A-DNA

Hemoglobin (1000)

Aspartate Transcarbamoylase (ATCase)

Induced Lac Repressor

Trypsin

Carboxypeptidase A

TATA-Binding Protein (TBP)

DPG-Hemoglobin Complex

Deoxyribonucleic Acid (DNA)

Collagen

Lac Repressor

Myoglobin

Oxyhemoglobin

Immunoglobulin G (IgG)

DNA

Hemoglobin

Lysozyme (512)

Cytochrome c (unbound)

Myoglobin Fold

B-DNA

Hemoglobin S

Cytochrome c

Crambin

Tomato Bushy Stunt Virus (TBSV)

Transfer Ribonucleic Acid (tRNA)

Intermolecular Contacts in Hemoglobin S

Ribonuclease S

Z-DNA

Myohemerythrin

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

Bacteriophage T4 Infection

Blood

Influenza Virus

Ebola Virus

CytoSkeleton

Collagen and Extracellular Matrix

Lipid Droplets

Model of a Mycoplasma Cell

Biosites: Red Blood Cell

SARS-CoV-2 mRNA Vaccine

Biosites: Basement Membrane

Phage-based COVID-19 Vaccine

Caulobacter Polar Microdomain

Measles Virus Proteins

Transfer RNA and Gag Protein

Escherichia coli

Excitatory and Inhibitory Synapses

Poliovirus Neutralization

HIV-Infected Cell

Biosites: Blood Plasma

Escherichia coli Bacterium

RecA and DNA

Cellulose Synthase

Biosites: Muscle

Myoglobin in a Whale Muscle Cell

SARS-CoV-2 Fusion

Immunological Synapse

HIV in Blood Plasma

Last Universal Common Ancestor

Red Blood Cell Cytoskeleton

Insulin Action

Casein Micelle and Fat Globule in Milk

Biosites: Cytoplasm

JCVI-syn3A Minimal Cell

Myelin

Mycoplasma mycoides

Coronavirus Life Cycle

Autophagy

Zika Virus

HIV Vaccine

Kinetochore

Vascular Endothelial Growth Factor (VegF) Signaling

Chloroplast

Respiratory Droplet

Biosites: Nucleus

Insulin Release

Coronavirus

Influenza Vaccine

SARS-CoV-2 and Neutralizing Antibodies

Abiogenesis