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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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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...
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Author Spotlight: Advancing Antiviral Strategies Through Novel Immunocapture and Mass Spectrometry Techniques
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Nonstructural protein 7 and 8 complexes of SARS-CoV-2.

Changhui Zhang1, Li Li1, Jun He2

  • 1State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, China.

Protein Science : a Publication of the Protein Society
|February 17, 2021
PubMed
Summary

Researchers determined the crystal structure of the SARS-CoV-2 nsp7+8 tetramer, revealing insights into viral replication mechanisms. This structure aids in designing new antiviral therapeutics against COVID-19 by targeting the viral replicase complex.

Keywords:
COVID-19SARS-CoV-2nsp7nsp7+8 complexnsp8

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Area of Science:

  • Structural biology
  • Virology
  • Drug discovery

Background:

  • COVID-19 pandemic caused by SARS-CoV-2, a highly contagious virus.
  • Viral replicase complex is crucial for viral replication and a key antiviral target.
  • Understanding SARS-CoV-2 replicase components is essential for developing therapeutics.

Purpose of the Study:

  • To determine the crystal structure of the SARS-CoV-2 nsp7+8 tetramer.
  • To elucidate the structural features of nsp7 and nsp8 involved in viral replication.
  • To provide a structural basis for designing novel antiviral drugs targeting SARS-CoV-2.

Main Methods:

  • X-ray crystallography was used to solve the structure of the SARS-CoV-2 nsp7+8 tetramer.
  • Analysis of protein structure revealed specific domains and their potential functions.
  • Biochemical assays were implied to understand nucleic acid interactions.

Main Results:

  • The crystal structure of the SARS-CoV-2 nsp7+8 tetramer was determined.
  • The structure revealed full-length nsp7 and a C-terminal fragment of nsp8.
  • A long helical extension and a flexible N-terminal domain of nsp8 were identified, showing affinity for nucleic acids.

Conclusions:

  • The nsp7+8 tetramer structure provides critical insights into the SARS-CoV-2 replication machinery.
  • The identified structural features of nsp8 suggest its role in nucleic acid binding during viral replication.
  • This structural information can guide the development of targeted antiviral therapies against COVID-19.