Molecule of the Month
May 2019

S-Nitrosylated Hemoglobin

Nitric oxide is attached to a conserved cysteine in hemoglobin and then released to control the flow of blood.


3D View:  1BUW




Health Focus: Antimicrobial Resistance

Antibiotics have saved countless lives, but pathogens are quickly finding ways to survive antibiotic treatment. Antibiotic-resistant bacteria are predicted to become the leading cause of death worldwide. They take many approaches: pumping antibiotics out of their cells, altering the molecular machinery that the antibiotics target, and attacking the antibiotics directly. Atomic structures publicly available in the PDB are revealing the details of drug resistance and providing new ways to combat it. Use the PDB-101 resources to learn about protein structures related to antibiotic action and resistance.

2019 Video Challenge for High School Students

Mechanisms of Bacterial Resistance to Aminoglycoside Antibiotics

Many thanks to all challenge participants, expert judges, teachers, parents, and voters who made this exciting competition happen.

Congratulations to the 2019 Winners!

Winner, First Place

Mira Mesa High School,
San Diego, CA

Winner, Second

The Quarry Lane School,
Dublin, CA

Winner, Third

Stuyvesant High School,
New York, NY

Winner, Viewers Choice

Rye Country Day School,
Rye, NY

Learn: Materials for Exploration
Learn about the relationship between protein structure and function.
Teach: Curricula
The RCSB PDB Curricula provide authentic, hands-on teaching materials, individual and group activities and assessment suggestions.
Education Corner: Using PDB Resources
Exploring the Molecules of Biological Warfare in Virtual Reality By Steve McCloskey, Nanome Inc.
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 ( All rights reserved.

Myoglobin Fold


Lac Repressor

Immunoglobulin G (IgG)

DPG-Hemoglobin Complex

Carboxypeptidase A


Tomato Bushy Stunt Virus (TBSV)

Hemoglobin S





Transfer Ribonucleic Acid (tRNA)

Ribonuclease S






Intermolecular Contacts in Hemoglobin S

TATA-Binding Protein (TBP)



Aspartate Transcarbamoylase (ATCase)

Deoxyribonucleic Acid (DNA)

Cytochrome c (unbound)


Cytochrome c

Induced Lac Repressor


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

Excitatory and Inhibitory Synapses

Insulin Action


Ebola Virus

Biosites: Cytoplasm

Biosites: Blood Plasma

Zika Virus

Mycoplasma mycoides

Biosites: Nucleus

Biosites: Basement Membrane

Escherichia coli

Biosites: Red Blood Cell

Measles Virus Proteins


HIV in Blood Plasma

Biosites: Muscle