The impact of post-translational modifications on protein function: Analyzing how phosphorylation, ubiquitination, and acetylation control protein activity and alter cellular signaling pathways
1Dr Maryam Naseer, 2Dr Saba Mehmood, 3Dr Iffat Ara Aziz, 4Mansoor Ali, 5Khurram Ali, 6Taimoor Ghori
Submission: 20 December 2025, Acceptance: 15 January 2026, Publication: 18 February 2026.
1Demonstrater of biochemistry, Ajk medical college muzaffarbad
2MBBS, FCPS, Classified Gynaecologist CMH Sargodha Pakistan
3Assistant Professor Baqai Medical University.
4UHS Lahore
5PIMS Islamabad
6PIMS Islamabad
ABSTRACT:
Background: Post-translational modifications (PTMs) play a crucial role in regulating protein function, stability, and interaction within cellular processes. Among these, phosphorylation, ubiquitination, and acetylation significantly influence protein activity and signaling pathways, impacting various physiological and pathological conditions. Understanding the extent to which these modifications control cellular responses is essential for advancing targeted therapeutic strategies.
Aim: This study aimed to investigate the impact of phosphorylation, ubiquitination, and acetylation on protein function, focusing on how these modifications regulate cellular signaling pathways.
Methods: A total of 50 protein samples were analyzed at Mayo Hospital, Lahore, from October 2023 to September 2024. Mass spectrometry-based proteomic techniques were employed to identify and quantify PTMs in key regulatory proteins. Functional assays, including kinase activity measurement, ubiquitin-protein interaction analysis, and histone acetylation assays, were conducted to evaluate the specific effects of these modifications on cellular pathways. Statistical analysis was performed to determine the correlation between PTMs and protein function alterations.
Results: Phosphorylation was found to enhance enzymatic activity in 62% of the analyzed proteins, particularly in kinases involved in signal transduction pathways. Ubiquitination led to protein degradation in 48% of cases, primarily affecting cell cycle regulators and apoptotic proteins. Acetylation was observed to modulate gene expression by altering chromatin accessibility, with 71% of histone proteins showing increased transcriptional activity upon acetylation. The study confirmed that these modifications collectively influenced key cellular processes, including proliferation, apoptosis, and stress response pathways.
Conclusion: The findings demonstrated that phosphorylation, ubiquitination, and acetylation play critical roles in regulating protein function and cellular signaling. Their collective impact on protein stability, enzymatic activity, and gene expression underscores their significance in both normal physiology and disease mechanisms. Targeting PTMs may offer promising therapeutic approaches for conditions where dysregulated protein modifications contribute to disease progression.Keywords: Post-translational modifications, phosphorylation, ubiquitination, acetylation, protein function, cellular signaling, proteomics