science

Tyrosine sulfation

Tyrosine sulfation is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tyrosine sulfation rather than just read about it. In short: In biochemistry, tyrosine sulfation is a posttranslational modification where a sulfate group (−SO3) is added to a tyrosine residue of a protein molecule. Secreted proteins and extracellular parts of membrane proteins that pass through the Golgi apparatus may be sulfated.

Key takeaways

Tyrosine sulfation belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tyrosine sulfation to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tyrosine sulfation from memory before moving on to harder problems.

Reference excerpt

In biochemistry, tyrosine sulfation is a posttranslational modification where a sulfate group (−SO3) is added to a tyrosine residue of a protein molecule. Secreted proteins and extracellular parts of membrane proteins that pass through the Golgi apparatus may be sulfated. Sulfation was first discovered by Bettelheim in bovine fibrinopeptide B in 1954 and later found to be present in animals and plants but not in prokaryotes or in yeast.

Function Sulfation plays a role in strengthening protein-protein interactions. Types of human proteins known to undergo tyrosine sulfation include adhesion molecules, G-protein-coupled receptors, coagulation factors, serine protease inhibitors, extracellular matrix proteins, and hormones. Tyrosine O-sulfate is a stable molecule and is excreted in urine in animals. No enzymatic mechanism of tyrosine sulfate desulfation is known to exist. By knock-out of TPST genes in mice, it may be observed that tyrosine sulfation has effects on the growth of the mice, such as body weight, fecundity, and postnatal viability.

Mechanism Sulfation is catalyzed by tyrosylprotein sulfotransferase (TPST) in the Golgi apparatus. The reaction catalyzed by TPST is a transfer of sulfate from the universal sulfate donor 3'-phosphoadenosine-5'-phosphosulfate (PAPS) to the side-chain hydroxyl group of a tyrosine residue. Sulfation sites are tyrosine residues exposed on the surface of the protein typically surrounded by acidic residues; a detailed description of the characteristics of the sulfation site was available from PROSITE and predicted by an on-line tool named the Sulfinator. Two types of tyrosylprotein sulftotransferases (TPST-1 and TPST2) have been identified.

Regulation There is very limited evidence that the TPST genes are subject to transcriptional regulation and tyrosine O-sulfate is very stable and cannot be easily degraded by mammalian sulfatases. Tyrosine O-sulfation is an irreversible process in vivo.

Clinical Significance It has been shown that the sulfation of Tyr1680 in Factor VIII is essential for effective binding to vWF. Thus, when this is mutated, patients may suffer mild haemophiliac symptoms due to increased turnover. Sulfation of the three tyrosines found in human PSGL-1 not only enhance its binding to P-selectin but also enables its pH-selective binding to the immune checkpoint protein VISTA.

Antibody for detection of tyrosine-sulfated epitopes In 2006, an article was published in the Journal of Biological Chemistry describing the production and characterization of an antibody called PSG2. This antibody shows exquisite sensitivity and specificity for epitopes containing sulfotyrosine independent of the sequence context.

References

Moore KL (2003). "The biology and enzymology of protein tyrosine O-sulfation". J. Biol. Chem. 278 (27): 24243–6. doi:10.1074/jbc.R300008200. PMID 12730193. Hoffhines AJ; Damoc, E; Bridges, KG; Leary, JA; Moore, KL (2006). "Detection and purification of tyrosine-sulfated proteins using a novel anti-sulfotyrosine monoclonal antibody". J. Biol. Chem. 281 (49): 37877–87. doi:10.1074/jbc.M609398200. PMC 1764208. PMID 17046811.

Worked examples

Example 1 — a first encounter with Tyrosine sulfation

Start with the simplest possible case. Write down what Tyrosine sulfation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tyrosine sulfation before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tyrosine sulfation ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tyrosine sulfation

In research: Tyrosine sulfation appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tyrosine sulfation in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tyrosine sulfation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Post-translational modification, so understanding it makes those chapters shorter.
In everyday life: Look for Tyrosine sulfation outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tyrosine sulfation in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tyrosine sulfation means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tyrosine sulfation out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tyrosine sulfation in simple terms?

Why does Tyrosine sulfation matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tyrosine sulfation?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tyrosine sulfation.