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Foundation Sciences · Biochemistry

Post-Translational Modification

⏱️ 45–60 minutes read 📖 Biochemistry

Phosphorylation, glycosylation, ubiquitination, acetylation and proteolytic cleavage of proteins.

📌 Learning Objectives

  • Describe the key principles of post-translational modification.
  • Explain the clinical relevance of post-translational modification.
  • Recognise common conditions linked to post-translational modification in MLA-style scenarios.

📋 Overview

Phosphorylation, glycosylation, ubiquitination, acetylation and proteolytic cleavage of proteins. This topic integrates with pathology, pharmacology and clinical medicine and is frequently tested in UK medical school exams and the MLA.

🔬 Basic Science

Phosphorylation, glycosylation, ubiquitination, acetylation and proteolytic cleavage of proteins. Detailed mechanisms, regulation and molecular interactions underpin both normal physiology and disease.

🏥 Clinical Relevance

Bortezomib (myeloma), CDG syndromes, prion misfolding.

🧪 Investigations

Relevant laboratory tests, imaging or histological examination are used as appropriate to the clinical context.

💊 Management

Management is condition-specific; principles include addressing the underlying biochemical/structural derangement, supportive care and targeted therapy where available.

Revision Resources – expand the sections below for high-yield notes, exam pearls, key facts and further reading.

🎯 MLA High-Yield Notes & Quick Revision ⌄
High-yield topic for the UK MLA — frequently appears in SBA questions linking biochemistry concepts to clinical presentations and management decisions.
Applying biomedical science to clinical practice Diagnosis and investigation Pathophysiology of common conditions
  • Phosphorylation, glycosylation, ubiquitination, acetylation and proteolytic cleavage of proteins.
⭐ Exam Pearls ⌄
⭐ High Yield
Phosphorylation on Ser/Thr/Tyr
Ubiquitin tags for proteasome (bortezomib target)
N-linked glycosylation in ER
Insulin from pre-pro-insulin by proteolysis
💡 Clinical Pearl
: Bortezomib (myeloma), CDG syndromes, prion misfolding.
⚠️ Exam Tip — Common Mistakes
Confusing post-translational modification with related but distinct mechanisms.
Memorising pathways without linking to clinical disease.
🔑 Key Facts ⌄
Phosphorylation on Ser/Thr/Tyr
Ubiquitin tags for proteasome (bortezomib target)
N-linked glycosylation in ER
Insulin from pre-pro-insulin by proteolysis
📚 References ⌄
  1. BMJ Best Practice
  2. Robbins Basic Pathology
  3. Lippincott Illustrated Reviews: Biochemistry
  4. Wheater's Functional Histology
  5. NICE guidance where applicable.

Further Resources

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