biology

Pathogenesis-related protein

Pathogenesis-related protein 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 Pathogenesis-related protein rather than just read about it. In short: Pathogenesis-related (PR) proteins are proteins produced in plants in the event of a pathogen attack. They are induced as part of systemic acquired resistance.

Key takeaways

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

Reference excerpt

Pathogenesis-related (PR) proteins are proteins produced in plants in the event of a pathogen attack. They are induced as part of systemic acquired resistance. Infections activate genes that produce PR proteins. Some of these proteins are antimicrobial, attacking molecules in the cell wall of a bacterium or fungus. Others may function as signals that spread "news" of the infection to nearby cells. Infections also stimulate the cross-linking of molecules in the cell wall and the deposition of lignin, responses that set up a local barricade that slows spread of the pathogen to other parts of the plant. Salicylic acid plays a role in the resistance to pathogens by inducing the production of pathogenesis-related proteins. Many proteins found in wine are grape pathogen-related proteins. Those include thaumatin-like proteins and chitinases. Many pathogenesis-related protein families also coincide with groups of human allergens, even though the allergy may have nothing to do with the defense function of the proteins. Grouping these proteins by their sequence features allows for finding potential allergenic proteins from sequenced plant genomes, a field of study dubbed "allergenomics".

Classification

As of 2014, 17 families of PR proteins have been named:

Identification As PR proteins are produced when plant tissue is stressed, various ways of stress signaling is used to "bait" the plant into expressing PR genes for identification. Useful stressors include an actual infection or simply defense signals such as salicylate and methyl jasmonate. The proteins can be identified by isolation, peptide digestion, and matching against the genomic sequences (protein sequencing). The sequences obtained can then be checked against known PR protein families for categorization.

See also Acibenzolar-S-methyl Glossary of phytopathology R gene, unrelated resistance proteins

References

Further reading Muthukrishnan S, Datta SP (1999). Pathogenesis-related proteins in plants. Boca Raton: CRC Press. pp. 291. ISBN 0-8493-0697-3. "Defense-Related Proteins of Higher Plants". dmd.nihs.go.jp. Archived from the original on 2022-08-02. Retrieved 2019-05-28. This article incorporates text by Mau Sinha, Rashmi Prabha Singh, Gajraj Singh Kushwaha, Naseer Iqbal, Avinash Singh, Sanket Kaushik, Punit Kaur, Sujata Sharma, and Tej P. Singh available under the CC BY 3.0 license.

External links WHO Allergen Nomenclature for conversion of allergens to specific sequences. UniProt keyword: KW-0568 Gene ontology mapping: GO:0009607, GO:0006952

Worked examples

Example 1 — a first encounter with Pathogenesis-related protein

Start with the simplest possible case. Write down what Pathogenesis-related protein 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 Pathogenesis-related protein 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 Pathogenesis-related protein 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 Pathogenesis-related protein

In research: Pathogenesis-related protein 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 Pathogenesis-related protein 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: Pathogenesis-related protein is common in secondary-school and first-year university syllabi. It links to neighbouring topics Plant proteins, Protein stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Pathogenesis-related protein 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 Pathogenesis-related protein in 20 minutes

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

Frequently asked questions

What is Pathogenesis-related protein in simple terms?

Pathogenesis-related (PR) proteins are proteins produced in plants in the event of a pathogen attack. They are induced as part of systemic acquired resistance.

Why does Pathogenesis-related protein 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 Pathogenesis-related protein?

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 Pathogenesis-related protein.