Introduction: Uncovering How Gravity Regulates Organellar Protein Synthesis
Physical mechanical cues including gravity and mechanical tension are core external factors that affect organismal growth, metabolism and homeostasis. For a long time, how mechanical stimuli modulate core cellular processes has been a key unsolved problem in cell biology and space biology. A research team led by Shintaro Iwasaki from RIKEN and the University of Tokyo recently published research in Nature Communications, which for the first time identified the direct regulatory pathway connecting gravity and mechanical force to mitochondrial protein synthesis.
PTM BIO’s malonylation antibody (Cat. No. PTM-201, working dilution: 1:1000) was used to complete critical immunological validation throughout the study, providing supporting evidence for the core molecular mechanism proposed in the paper. PTM BIO independently discovered multiple novel lysine acylation modifications, including succinylation, lactylation, crotonylation and others. The company provides pan-modification antibodies and comprehensive PTM proteomics services, helping researchers worldwide analyze metabolic signaling pathways that cannot be observed with conventional research tools.
Major Breakthrough: First Elucidation of the Full Molecular Pathway by Which Microgravity Regulates Mitochondrial Translation
Previous space biomedical research has mostly focused on transcriptomics and macroscopic physiological changes. There has long been no clear analytical scheme to interpret the molecular mechanisms governing dynamic mitochondrial translation under microgravity, and research in this field has stalled for years due to limitations in modification detection technologies and specific research antibodies.
Using live samples from the International Space Station, ground-based 3D clinostats to simulate microgravity, together with validation across multiple species, the team mapped out the complete regulatory pathway: Microgravity weakens cell adhesion signals and inhibits the core FAK/RAC1/PAK1/BAD signaling cascade. This inhibition further suppresses mitochondrial fatty acid synthesis (mtFAS), leading to massive accumulation of malonyl-CoA within mitochondria. Excess malonyl-CoA induces non-enzymatic hypermalonylation on key lysine residues of mitochondrial ribosomes and translation elongation factors, which directly inhibits the initiation and elongation of mitochondrial translation and negatively regulates mitochondrial protein synthesis.
The study also confirmed that this regulatory pathway features both dynamic properties and reversibility: restoring mechanical stimulation reactivates the mtFAS pathway, consumes accumulated malonyl-CoA, reverses excessive protein malonylation, and restores normal mitochondrial translation function.
Malonylation Antibody (PTM-201) Supports Verification of Core Mechanisms
In this high-impact research achievement, PTM BIO’s PTM-201 antibody served as the core technical reagent for detecting and immunologically verifying protein malonylation under microgravity and mechanical unloading conditions, acting as an essential tool to validate this novel regulatory mechanism.
Boasting high specificity and sensitivity as a PTM antibody, PTM-201 accurately recognizes malonylation sites within the mitochondrial translation system. It enabled quantitative validation of modification levels under different experimental conditions and provided core experimental evidence for the discovery of this brand-new regulatory pathway.
PTM BIO: Innovative Acylation Detection Reagents Support Landmark Space Biology Research
As a leading global platform dedicated to post-translational modification (PTM) proteomics and specific antibody development, PTM BIO has spent years advancing acylation detection technologies. It provides high-performance pan-modification antibodies, site-specific modification antibodies and complete PTM proteomics research solutions covering lactylation, β-hydroxybutyrylation, propionylation, crotonylation and more.
Its products and technologies have supported more than 4,600 publications, including 37 papers published in Cell, Nature and Science. Widely applied in cutting-edge fields such as space biology, metabolic biology, oncology and neuroscience, PTM BIO consistently supports global research teams to tackle top-tier research challenges and produce high-scoring original research findings.
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