Sandbox R.Nithin 6XWD: Difference between revisions

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<scene name='10/1096858/Overview/1'>= SARS-CoV-2 Main Protease (Mpro) – Structure and Covalent Inhibition (PDB: 6XWD) =
SARS-CoV-2 Main Protease (Mpro) – Structure and Covalent Inhibition (PDB: 6XWD) =
This page provides  structural overview of the SARS-CoV-2 main protease (Mpro),  
This page provides  structural overview of the SARS-CoV-2 main protease (Mpro),  
based on the iScience 2020 study (DOI: https://doi.org/10.1016/j.isci.2020.101258) and the  
based on the iScience 2020 study (DOI: https://doi.org/10.1016/j.isci.2020.101258) and the  
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In this study , the researchers produced SARS-CoV-2 Nsp9 in the lab and sloved its X-ray crystal structure  
In this study , the researchers produced SARS-CoV-2 Nsp9 in the lab and sloved its X-ray crystal structure  


scene name='10/1096858/Overview/1'>Text To Be Displayed</scene


== Introduction ==
== Introduction ==
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Mpro functions as a homodimer, and each protomer is organized into three domains.  
Mpro functions as a homodimer, and each protomer is organized into three domains.  


Domain I (residues 8–101) consists of a β-barrel-like scaffold that forms part of thecatalytic cleft and positions His41 of the catalytic dyad.
Domain I (residues 8–101) consists of a β-barrel-like scaffold that forms part of thecatalytic cleft and positions His41 of the catalytic dyad.The central domain of Nsp9 is composed of seven β-strands that fold  into an oblong β-barrel structure 1
This β-barrel acts as the main stabilizing framework of the protein and is responsible for maintaining the shape and rigidity necessary for function. Because this fold is nearly identical across SARS-CoV and SARS-CoV-2, it suggests that the structural design is crucial for maintaining viral replication efficiency 2
Domain I is built mainly from antiparallel β-strands arranged into a β-barrel–like fold.
Domain I is built mainly from antiparallel β-strands arranged into a β-barrel–like fold.
This domain forms one half of the active site cleft, and it holds His41, which is part of the catalytic dyad.
This domain forms one half of the active site cleft, and it holds His41, which is part of the catalytic dyad.
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Thus, Domain III functions as the activation switch of the protease by enabling dimer formation and structural locking.Its interactions with the opposite protomer stabilize the active conformation of the enzyme. Because Mpro activity depends on dimerization, Domain III indirectly controls catalytic function. Overall, the coordinated architecture of these three domains enables Mpro to recognize, bind, and cleave viral substrates with high specificity.
Thus, Domain III functions as the activation switch of the protease by enabling dimer formation and structural locking.Its interactions with the opposite protomer stabilize the active conformation of the enzyme. Because Mpro activity depends on dimerization, Domain III indirectly controls catalytic function. Overall, the coordinated architecture of these three domains enables Mpro to recognize, bind, and cleave viral substrates with high specificity.


<Structure load='Mpro is active as a homodimer. Each protomer has three domains:
* '''Domain I (8–101)''': β-barrel catalytic scaffold
  The central domain of Nsp9 is composed of seven β-strands that fold  into an oblong β-barrel structure 1
This β-barrel acts as the main stabilizing framework of the protein and is responsible for maintaining the shape and rigidity necessary for function. Because this fold is nearly identical across SARS-CoV and SARS-CoV-2, it suggests that the structural design is crucial for maintaining viral replication efficiency 2
 
* '''Domain II (102–184)''': substrate-binding groove 
* '''Domain III (201–303)''': helical region required for dimerization' size='350' frame='true' align='right' caption='Insert caption here' scene='Insert optional scene name here' /> 




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Together, the catalytic dyad, oxyanion hole, and surrounding pockets form a tightly coordinated active-site architecture that ensures high specificity and efficiency in viral polyprotein processing.
Together, the catalytic dyad, oxyanion hole, and surrounding pockets form a tightly coordinated active-site architecture that ensures high specificity and efficiency in viral polyprotein processing.


Visualize the active site here: 
 
* {{SceneLink|Sandbox_R.Nithin_6XWD|Catalytic_Dyad}}
== Inhibitor Binding (6XWD) ==
The 6XWD structure captures Mpro bound to a covalent peptide-like inhibitor, revealing how the active site accommodates small-molecule or peptide-based antiviral compounds. The inhibitor occupies the **S1**, **S2**, and **S4** substrate-binding pockets that are formed at the interface of Domain I and Domain II.
The 6XWD structure captures Mpro bound to a covalent peptide-like inhibitor, revealing how the active site accommodates small-molecule or peptide-based antiviral compounds. The inhibitor occupies the **S1**, **S2**, and **S4** substrate-binding pockets that are formed at the interface of Domain I and Domain II.


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