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.

Crambin

A-DNA

Lysozyme (488)

Transfer Ribonucleic Acid (tRNA)

Immunoglobulin G (IgG)

Trypsin

Myoglobin Fold

Aspartate Transcarbamoylase (ATCase)

Ribonuclease S

Lysozyme (512)

Hemoglobin S

Intermolecular Contacts in Hemoglobin S

Deoxyribonucleic Acid (DNA)

B-DNA

DPG-Hemoglobin Complex

Z-DNA

Hemoglobin (1000)

Lac Repressor

Hemoglobin

Deoxyhemoglobin

Cytochrome c

Collagen

Induced Lac Repressor

Myoglobin

Carboxypeptidase A

DNA

Myohemerythrin

TATA-Binding Protein (TBP)

Cytochrome c (unbound)

Tomato Bushy Stunt Virus (TBSV)

Oxyhemoglobin

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

Biosites: Basement Membrane

Cellulose Synthase

Biosites: Blood Plasma

SARS-CoV-2 and Neutralizing Antibodies

Transfer RNA and Gag Protein

Influenza Vaccine

Bacteriophage T4 Infection

Myelin

Measles Virus Proteins

SARS-CoV-2 mRNA Vaccine

Respiratory Droplet

Excitatory and Inhibitory Synapses

Lipid Droplets

CytoSkeleton

Vascular Endothelial Growth Factor (VegF) Signaling

Immunological Synapse

Insulin Action

Biosites: Nucleus

Coronavirus

Biosites: Red Blood Cell

Phage-based COVID-19 Vaccine

Caulobacter Polar Microdomain

Casein Micelle and Fat Globule in Milk

HIV in Blood Plasma

Last Universal Common Ancestor

Zika Virus

Autophagy

Mycoplasma mycoides

Kinetochore

JCVI-syn3A Minimal Cell

Biosites: Muscle

Model of a Mycoplasma Cell

Chloroplast

RecA and DNA

Insulin Release

SARS-CoV-2 Fusion

Biosites: Cytoplasm

Escherichia coli

Ebola Virus

Influenza Virus

Poliovirus Neutralization

Red Blood Cell Cytoskeleton

HIV-Infected Cell

Collagen and Extracellular Matrix

Coronavirus Life Cycle

Abiogenesis

Myoglobin in a Whale Muscle Cell

Blood

HIV Vaccine

Escherichia coli Bacterium