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.

Cytochrome c

A-DNA

Crambin

Transfer Ribonucleic Acid (tRNA)

Collagen

Myoglobin

Hemoglobin (1000)

Hemoglobin

Aspartate Transcarbamoylase (ATCase)

Ribonuclease S

Induced Lac Repressor

TATA-Binding Protein (TBP)

Tomato Bushy Stunt Virus (TBSV)

Lysozyme (488)

Lac Repressor

DNA

Carboxypeptidase A

Intermolecular Contacts in Hemoglobin S

Z-DNA

Deoxyribonucleic Acid (DNA)

Oxyhemoglobin

Deoxyhemoglobin

Lysozyme (512)

Immunoglobulin G (IgG)

DPG-Hemoglobin Complex

Cytochrome c (unbound)

Myoglobin Fold

Hemoglobin S

Myohemerythrin

Trypsin

B-DNA

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

Kinetochore

Model of a Mycoplasma Cell

Biosites: Blood Plasma

RecA and DNA

Biosites: Nucleus

Transfer RNA and Gag Protein

Influenza Vaccine

Biosites: Muscle

HIV in Blood Plasma

Biosites: Basement Membrane

SARS-CoV-2 Fusion

Coronavirus

SARS-CoV-2 and Neutralizing Antibodies

Red Blood Cell Cytoskeleton

CytoSkeleton

Abiogenesis

Excitatory and Inhibitory Synapses

Escherichia coli Bacterium

JCVI-syn3A Minimal Cell

Mycoplasma mycoides

Lipid Droplets

Vascular Endothelial Growth Factor (VegF) Signaling

Blood

Casein Micelle and Fat Globule in Milk

Autophagy

Zika Virus

HIV Vaccine

Phage-based COVID-19 Vaccine

Measles Virus Proteins

HIV-Infected Cell

Cellulose Synthase

Insulin Release

Myelin

Coronavirus Life Cycle

Ebola Virus

Immunological Synapse

Insulin Action

Last Universal Common Ancestor

Chloroplast

Bacteriophage T4 Infection

Collagen and Extracellular Matrix

Poliovirus Neutralization

Myoglobin in a Whale Muscle Cell

Respiratory Droplet

Escherichia coli

SARS-CoV-2 mRNA Vaccine

Biosites: Cytoplasm

Caulobacter Polar Microdomain

Influenza Virus

Biosites: Red Blood Cell