biology

Proton-dependent oligopeptide transporter

Proton-dependent oligopeptide transporter 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 Proton-dependent oligopeptide transporter rather than just read about it. In short: Proteins of the Proton-dependent Oligopeptide Transporter (POT) Family (also called the PTR (peptide transport) family) are found in animals, plants, yeast, archaea and both Gram-negative and Gram-positive bacteria, and are part of the major facilitator superfamily. The transport of peptides into cells is a well-documented biological phenomenon which is accomplished by specific, energy-dependent transporters found i…

Key takeaways

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

Reference excerpt

Proteins of the Proton-dependent Oligopeptide Transporter (POT) Family (also called the PTR (peptide transport) family) are found in animals, plants, yeast, archaea and both Gram-negative and Gram-positive bacteria, and are part of the major facilitator superfamily. The transport of peptides into cells is a well-documented biological phenomenon which is accomplished by specific, energy-dependent transporters found in a number of organisms as diverse as bacteria and humans. The proton-dependent oligopeptide transporter (PTR) family of proteins is distinct from the ABC-type peptide transporters and was uncovered by sequence analyses of a number of recently discovered peptide transport proteins. These proteins that seem to be mainly involved in the intake of small peptides with the concomitant uptake of a proton.

Function While most members of the POT family catalyze peptide transport, one is a nitrate permease and one can transport histidine, as well as peptides. Some of the peptide transporters can also transport antibiotics. They function by proton symport, but the substrate:H+ stoichiometry is variable: the high-affinity rat PepT2 carrier catalyzes uptake of 2 and 3 H+ with neutral and anionic dipeptides, respectively, while the low affinity PepT1 carrier catalyzes uptake of one H+ per neutral peptide.

Transport Reaction The generalized transport reaction catalyzed by the proteins of the POT family is: substrate (out) + H (out) → substrate (in) H+ (in)

Structure and Mechanism The proteins are of about 450-600 amino acyl residues in length with the eukaryotic proteins in general being longer than the bacterial proteins. They exhibit 12 putative or established transmembrane α-helical spanners. Pairs of salt bridge interactions between transmembrane helices work in tandem to orchestrate alternating access transport within the PTR family. Key roles for residues conserved between bacterial and eukaryotic homologues suggest a conserved mechanism of peptide recognition and transport that in some cases has been subtly modified in individual species.

Subfamilies Oligopeptide transporter, peptide:H+ symporter InterPro: IPR004768 Amino acid/peptide transporter InterPro: IPR005279

Human proteins containing this domain FP12591; PEPT1; PTR4; SLC15A1; SLC15A2; SLC15A3; SLC15A4; hPEPT1-RF;

References

As of this edit, this article uses content from "2.A.17 The Proton-dependent Oligopeptide Transporter (POT/PTR) Family", which is licensed in a way that permits reuse under the Creative Commons Attribution-ShareAlike 3.0 Unported License, but not under the GFDL. All relevant terms must be followed.

Worked examples

Example 1 — a first encounter with Proton-dependent oligopeptide transporter

Start with the simplest possible case. Write down what Proton-dependent oligopeptide transporter 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 Proton-dependent oligopeptide transporter 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 Proton-dependent oligopeptide transporter 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 Proton-dependent oligopeptide transporter

In research: Proton-dependent oligopeptide transporter 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 Proton-dependent oligopeptide transporter 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: Proton-dependent oligopeptide transporter is common in secondary-school and first-year university syllabi. It links to neighbouring topics Integral membrane proteins, Membrane protein stubs, Membrane proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Proton-dependent oligopeptide transporter 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 Proton-dependent oligopeptide transporter in 20 minutes

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

Frequently asked questions

What is Proton-dependent oligopeptide transporter in simple terms?

Why does Proton-dependent oligopeptide transporter 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 Proton-dependent oligopeptide transporter?

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 Proton-dependent oligopeptide transporter.