Related Experiment Video
Updated: May 18, 2026
10:40
Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods
Published on: December 21, 2019
Structural basis for specific recognition of substrates by sapovirus protease
Masaru Yokoyama1, Tomoichiro Oka, Hirotatsu Kojima
1Pathogen Genomics Center, National Institute of Infectious Diseases Tokyo, Japan.
Frontiers in Microbiology
|September 14, 2012
Summary
Sapovirus protease uses two distinct clefts for substrate recognition, enabling viral replication. This study identified novel inhibitors by understanding these binding mechanisms.
Area of Science:
- Virology
- Structural Biology
- Medicinal Chemistry
Background:
- Sapovirus (SaV) protease is essential for viral replication and maturation, cleaving a viral polyprotein at six specific sites.
- The precise mechanisms underlying SaV protease's recognition of diverse cleavage site sequences are not well understood.
Purpose of the Study:
- To elucidate the molecular mechanisms of SaV protease substrate recognition.
- To identify potential inhibitors of SaV protease based on its structural features.
Main Methods:
- Computational approaches including structural modeling and docking studies.
- Information entropy analysis and site-directed mutagenesis.
- In vitro enzymatic assays to test compound inhibition.
Main Results:
- Structural modeling revealed two small clefts within the SaV protease cavity facilitating substrate binding through aromatic stacking and electrostatic interactions.
- Information entropy and mutagenesis studies indicated functional variability within these two clefts.
- Three chemical compounds, designed based on substrate-mimicking features, demonstrated in vitro inhibitory activity against SaV protease.
Conclusions:
- The two identified clefts serve as crucial structural anchors for the SaV protease to bind various substrates effectively.
- Understanding these binding pockets offers a basis for developing targeted SaV protease inhibitors.
Related Concept Videos
00:56Viral Structure
Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
02:28Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
01:29Subviral Agents
Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...