biology

Phosphotyrosine-binding domain

Phosphotyrosine-binding domain is a biology 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 Phosphotyrosine-binding domain rather than just read about it. In short: In molecular biology, phosphotyrosine-binding domains are protein domains which bind to phosphotyrosine. The phosphotyrosine-binding domain (PTB, also phosphotyrosine-interaction or PI domain) in the protein tensin tends to be found at the C-terminus.

Key takeaways

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

Reference excerpt

In molecular biology, phosphotyrosine-binding domains are protein domains which bind to phosphotyrosine. The phosphotyrosine-binding domain (PTB, also phosphotyrosine-interaction or PI domain) in the protein tensin tends to be found at the C-terminus. Tensin is a multi-domain protein that binds to actin filaments and functions as a focal-adhesion molecule (focal adhesions are regions of plasma membrane through which cells attach to the extracellular matrix). Human tensin has actin-binding sites, an SH2 (Pfam PF00017) domain and a region similar to the tumour suppressor PTEN. The PTB domain interacts with the cytoplasmic tails of beta integrin by binding to an NPXY motif. The phosphotyrosine-binding domain of insulin receptor substrate-1 is not related to the phosphotyrosine-binding domain of tensin. Insulin receptor substrate-1 proteins contain both a pleckstrin homology domain and a phosphotyrosine binding (PTB) domain. The PTB domains facilitate interaction with the activated tyrosine-phosphorylated insulin receptor. The PTB domain is situated towards the N terminus. Two arginines in this domain are responsible for hydrogen bonding phosphotyrosine residues on an Ac-LYASSNPApY-NH2 peptide in the juxtamembrane region of the insulin receptor. Further interactions via "bridged" water molecules are coordinated by residues an Asn and a Ser residue. The PTB domain has a compact, 7-stranded beta-sandwich structure, capped by a C-terminal helix. The substrate peptide fits into an L-shaped surface cleft formed from the C-terminal helix and strands 5 and 6.

Human proteins containing these domains APBA1; APBA2; APBA3; APPL1; EPS8; EPS8L1; EPS8L2; EPS8L3; TENC1; TNS; TNS1; TNS3; TNS4; DOK1; DOK2; DOK3; DOK4; DOK5; DOK6; DOK7; FRS2; FRS3; IRS1; IRS2; IRS4; NOS1AP; TLN1; TLN2

See also SH2 domains also bind phosphorylated tyrosines

References

External links Eukaryotic Linear Motif resource motif class LIG_PTB_Phospho_1

Illustrations

Worked examples

Example 1 — a first encounter with Phosphotyrosine-binding domain

Start with the simplest possible case. Write down what Phosphotyrosine-binding domain claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Phosphotyrosine-binding domain 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 Phosphotyrosine-binding domain 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 Phosphotyrosine-binding domain

In research: Phosphotyrosine-binding domain appears in biology 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 Phosphotyrosine-binding domain 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: Phosphotyrosine-binding domain is common in secondary-school and first-year university syllabi. It links to neighbouring topics Membrane protein stubs, Membrane proteins, Protein domains, so understanding it makes those chapters shorter.
In everyday life: Look for Phosphotyrosine-binding domain 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 Phosphotyrosine-binding domain in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Phosphotyrosine-binding domain 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 Phosphotyrosine-binding domain out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Phosphotyrosine-binding domain in simple terms?

Why does Phosphotyrosine-binding domain matter?

Because it connects several biology 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 Phosphotyrosine-binding domain?

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 Phosphotyrosine-binding domain.