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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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.

DNA

Lysozyme (512)

Collagen

TATA-Binding Protein (TBP)

Z-DNA

Myoglobin Fold

Cytochrome c (unbound)

Deoxyhemoglobin

Tomato Bushy Stunt Virus (TBSV)

Lac Repressor

Intermolecular Contacts in Hemoglobin S

Oxyhemoglobin

Myoglobin

A-DNA

Aspartate Transcarbamoylase (ATCase)

Cytochrome c

Trypsin

Induced Lac Repressor

Lysozyme (488)

Deoxyribonucleic Acid (DNA)

Crambin

DPG-Hemoglobin Complex

Carboxypeptidase A

Myohemerythrin

Hemoglobin (1000)

Transfer Ribonucleic Acid (tRNA)

Immunoglobulin G (IgG)

Ribonuclease S

Hemoglobin

B-DNA

Hemoglobin S

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

Zika Virus

Biosites: Cytoplasm

Model of a Mycoplasma Cell

Red Blood Cell Cytoskeleton

Myoglobin in a Whale Muscle Cell

HIV-Infected Cell

Bacteriophage T4 Infection

Abiogenesis

Biosites: Muscle

Escherichia coli

Insulin Action

Collagen and Extracellular Matrix

Lipid Droplets

Last Universal Common Ancestor

Caulobacter Polar Microdomain

Biosites: Nucleus

Mycoplasma mycoides

Vascular Endothelial Growth Factor (VegF) Signaling

Poliovirus Neutralization

Cellulose Synthase

JCVI-syn3A Minimal Cell

Influenza Vaccine

CytoSkeleton

RecA and DNA

Influenza Virus

SARS-CoV-2 mRNA Vaccine

Ebola Virus

Coronavirus

Autophagy

HIV Vaccine

Excitatory and Inhibitory Synapses

Respiratory Droplet

Myelin

HIV in Blood Plasma

Measles Virus Proteins

Biosites: Red Blood Cell

Casein Micelle and Fat Globule in Milk

Chloroplast

Immunological Synapse

Insulin Release

Biosites: Blood Plasma

Phage-based COVID-19 Vaccine

Biosites: Basement Membrane

SARS-CoV-2 and Neutralizing Antibodies

Transfer RNA and Gag Protein

Blood

SARS-CoV-2 Fusion

Kinetochore

Coronavirus Life Cycle

Escherichia coli Bacterium