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tRNA Activation

tRNA Activation

Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...

tRNA Activation

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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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RNA Structure

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Related Experiment Video

Updated: Nov 9, 2025

The MultiBac Protein Complex Production Platform at the EMBL

The MultiBac Protein Complex Production Platform at the EMBL

Published on: July 11, 2013

Structures and functions of multi-tRNA synthetase complexes.

Myung Hee Kim¹, Sunghoon Kim²

¹Infection and Immunity Research Laboratory, Metabolic Regulation Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, South Korea.

|April 10, 2021

Summary

The human body maintains balance through biological processes regulated by aminoacyl-tRNA synthetases. The multi-tRNA synthetase complex (MSC) is key to biological complexity and development, with its components regulating functions beyond basic catalysis.

Keywords:

Aminoacyl-tRNA synthetase Homeostasis Multi-tRNA synthetase complex Non-catalytic activities Protein synthesis Structure and function

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Last Updated: Nov 9, 2025

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Area of Science:

Molecular Biology
Cellular Biology
Biochemistry

Background:

The human body relies on homeostatic balance maintained by controlled biological processes like DNA replication, transcription, and translation.
Aminoacyl-tRNA synthetases are essential enzymes involved in protein synthesis and have diverse biological roles.
The cytoplasmic multi-tRNA synthetase complex (MSC) is implicated as a central regulator of biological complexity.

Purpose of the Study:

To review current knowledge on the components of the human multi-tRNA synthetase complex (MSC).
To explore the functions of MSC components beyond their canonical catalytic activities.
To understand the role of MSC structural integrity in biological complexity and organismal development.

Main Methods:

Literature review of existing research on aminoacyl-tRNA synthetases and the MSC.
Analysis of studies investigating the non-canonical functions of MSC components.
Correlation analysis of MSC structural integrity with biological complexity in higher organisms.

Main Results:

The structural integrity of the MSC is linked to increasing biological complexity.
MSC components are associated with and regulate functions beyond their catalytic roles in protein synthesis.
The MSC plays a crucial role in the system development of higher organisms.

Conclusions:

The multi-tRNA synthetase complex (MSC) is a critical cellular machinery involved in regulating biological complexity.
Understanding the non-catalytic functions of MSC components is essential for comprehending higher biological systems.
Further research into the human MSC is needed to fully elucidate its role in homeostasis and development.