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.

Immunoglobulin G (IgG)

TATA-Binding Protein (TBP)

Collagen

Intermolecular Contacts in Hemoglobin S

Carboxypeptidase A

Lysozyme (488)

Myohemerythrin

Ribonuclease S

Cytochrome c (unbound)

Z-DNA

Aspartate Transcarbamoylase (ATCase)

Crambin

Lysozyme (512)

B-DNA

Lac Repressor

Deoxyribonucleic Acid (DNA)

A-DNA

Oxyhemoglobin

DNA

Tomato Bushy Stunt Virus (TBSV)

Hemoglobin S

Myoglobin

Hemoglobin

Myoglobin Fold

Hemoglobin (1000)

DPG-Hemoglobin Complex

Deoxyhemoglobin

Cytochrome c

Trypsin

Induced Lac Repressor

Transfer Ribonucleic Acid (tRNA)

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

Immunological Synapse

SARS-CoV-2 Fusion

HIV-Infected Cell

Chloroplast

HIV in Blood Plasma

Vascular Endothelial Growth Factor (VegF) Signaling

Excitatory and Inhibitory Synapses

Biosites: Basement Membrane

Biosites: Red Blood Cell

Coronavirus Life Cycle

Last Universal Common Ancestor

HIV Vaccine

SARS-CoV-2 mRNA Vaccine

JCVI-syn3A Minimal Cell

Caulobacter Polar Microdomain

Biosites: Nucleus

Influenza Vaccine

Myelin

Collagen and Extracellular Matrix

Transfer RNA and Gag Protein

Autophagy

Model of a Mycoplasma Cell

Biosites: Blood Plasma

SARS-CoV-2 and Neutralizing Antibodies

Myoglobin in a Whale Muscle Cell

Phage-based COVID-19 Vaccine

Escherichia coli

Insulin Release

Biosites: Cytoplasm

Bacteriophage T4 Infection

CytoSkeleton

Coronavirus

Poliovirus Neutralization

Red Blood Cell Cytoskeleton

Influenza Virus

Kinetochore

Measles Virus Proteins

Mycoplasma mycoides

Ebola Virus

Zika Virus

Cellulose Synthase

Blood

Insulin Action

Respiratory Droplet

Biosites: Muscle

Abiogenesis

RecA and DNA

Escherichia coli Bacterium

Casein Micelle and Fat Globule in Milk

Lipid Droplets