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.

Tomato Bushy Stunt Virus (TBSV)

A-DNA

Transfer Ribonucleic Acid (tRNA)

Myoglobin Fold

Collagen

Crambin

Hemoglobin

Cytochrome c

Intermolecular Contacts in Hemoglobin S

Immunoglobulin G (IgG)

Deoxyhemoglobin

B-DNA

TATA-Binding Protein (TBP)

Cytochrome c (unbound)

DNA

Trypsin

Ribonuclease S

Oxyhemoglobin

Deoxyribonucleic Acid (DNA)

Aspartate Transcarbamoylase (ATCase)

Induced Lac Repressor

DPG-Hemoglobin Complex

Hemoglobin S

Carboxypeptidase A

Z-DNA

Myoglobin

Lac Repressor

Hemoglobin (1000)

Myohemerythrin

Lysozyme (488)

Lysozyme (512)

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

Measles Virus Proteins

Kinetochore

Last Universal Common Ancestor

JCVI-syn3A Minimal Cell

Poliovirus Neutralization

Biosites: Red Blood Cell

Zika Virus

HIV Vaccine

Escherichia coli

Bacteriophage T4 Infection

Coronavirus Life Cycle

CytoSkeleton

Cellulose Synthase

Biosites: Muscle

Lipid Droplets

Insulin Action

Biosites: Cytoplasm

HIV-Infected Cell

Phage-based COVID-19 Vaccine

Insulin Release

SARS-CoV-2 and Neutralizing Antibodies

Coronavirus

Escherichia coli Bacterium

Red Blood Cell Cytoskeleton

RecA and DNA

Transfer RNA and Gag Protein

Biosites: Blood Plasma

Ebola Virus

Respiratory Droplet

Chloroplast

Vascular Endothelial Growth Factor (VegF) Signaling

Caulobacter Polar Microdomain

Casein Micelle and Fat Globule in Milk

SARS-CoV-2 Fusion

Biosites: Nucleus

Myoglobin in a Whale Muscle Cell

Influenza Virus

SARS-CoV-2 mRNA Vaccine

Myelin

HIV in Blood Plasma

Autophagy

Mycoplasma mycoides

Blood

Excitatory and Inhibitory Synapses

Model of a Mycoplasma Cell

Collagen and Extracellular Matrix

Abiogenesis

Influenza Vaccine

Immunological Synapse

Biosites: Basement Membrane