Molecule of the Month
August 2026

Histone Ubiquitination and Deubiquitination Complexes

Enzymes that add and remove marks from chromosomes to keep gene regulation in balance

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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.

Aspartate Transcarbamoylase (ATCase)

Intermolecular Contacts in Hemoglobin S

Trypsin

Cytochrome c (unbound)

Lysozyme (512)

TATA-Binding Protein (TBP)

DNA

Oxyhemoglobin

A-DNA

Z-DNA

Immunoglobulin G (IgG)

Lac Repressor

Hemoglobin

Transfer Ribonucleic Acid (tRNA)

Deoxyribonucleic Acid (DNA)

DPG-Hemoglobin Complex

Hemoglobin S

Cytochrome c

Hemoglobin (1000)

Carboxypeptidase A

Lysozyme (488)

Deoxyhemoglobin

Myoglobin

B-DNA

Myoglobin Fold

Ribonuclease S

Induced Lac Repressor

Tomato Bushy Stunt Virus (TBSV)

Crambin

Collagen

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

Abiogenesis

Model of a Mycoplasma Cell

Respiratory Droplet

CytoSkeleton

SARS-CoV-2 and Neutralizing Antibodies

Transfer RNA and Gag Protein

Immunological Synapse

Collagen and Extracellular Matrix

Kinetochore

Zika Virus

Influenza Vaccine

Mycoplasma mycoides

Last Universal Common Ancestor

HIV in Blood Plasma

Phage-based COVID-19 Vaccine

Biosites: Blood Plasma

Excitatory and Inhibitory Synapses

HIV-Infected Cell

Measles Virus Proteins

Caulobacter Polar Microdomain

Biosites: Red Blood Cell

Vascular Endothelial Growth Factor (VegF) Signaling

JCVI-syn3A Minimal Cell

Chloroplast

SARS-CoV-2 Fusion

Cellulose Synthase

Coronavirus Life Cycle

Escherichia coli

Influenza Virus

Myoglobin in a Whale Muscle Cell

Poliovirus Neutralization

Blood

Myelin

Ebola Virus

Casein Micelle and Fat Globule in Milk

Biosites: Muscle

Insulin Release

RecA and DNA

Escherichia coli Bacterium

Biosites: Cytoplasm

Bacteriophage T4 Infection

Biosites: Nucleus

Coronavirus

Autophagy

HIV Vaccine

Lipid Droplets

Biosites: Basement Membrane

Red Blood Cell Cytoskeleton

Insulin Action

SARS-CoV-2 mRNA Vaccine