biology

Guanylate-binding protein

Guanylate-binding 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 Guanylate-binding protein rather than just read about it. In short: In molecular biology, the guanylate-binding proteins family is a family of GTPases that is induced by interferon (IFN)-gamma. GTPases induced by IFN-gamma (Interferon-inducible GTPase) are key to the protective immunity against microbial and viral pathogens.

Key takeaways

Guanylate-binding 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 Guanylate-binding protein to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Guanylate-binding protein from memory before moving on to harder problems.

Reference excerpt

In molecular biology, the guanylate-binding proteins family is a family of GTPases that is induced by interferon (IFN)-gamma. GTPases induced by IFN-gamma (Interferon-inducible GTPase) are key to the protective immunity against microbial and viral pathogens. These GTPases are classified into three groups: the small 47-KD immunity-related GTPases (IRGs), the Mx proteins (MX1, MX2), and the large 65- to 67-kd GTPases. Guanylate-binding proteins (GBP) fall into the last class.

Genetic Information GBP genes have been universally recognized in mammalian as well as in most other vertebrate genomes. A single cluster of seven human GBP genes (GBP1-GBP7) is found on chromosome 1q22.2. Unlike humans, in genetically controllable disease models such as mice and zebrafish, members of the GBPs gene family are organized in more than one cluster, in this case, 11 (Gbp2b- Gbp110 and 4 genes (Gbp1-Gbp4), respectively. Examinations of GBP-related sequences have shown that zebrafish gbp3 and gbp4 contain an additional function to find (FIIND) and a caspase recruitment (CARD) domains that resemble those found within the inflammasome-related proteins: Apoptosis-associated speck-like protein containing a CARD (PYCARD) and NLR Family Pyrin Domain Containing 1 (NLRP1).

Structure Structurally, GBPs consist of two domains: a globular N- terminal domain harboring the GTPase function, and an extended C- terminal helical domain. In addition, some members of the GBPs family harbor motifs (e.g., CaaX motifs) or additional domains that are thought to operate in protein-protein or protein-membrane interactions.

Activity Some GBPs have exhibited the ability to bind not only guanosine triphosphate (GTP) to produce guanosine diphosphate (GDP) but also GDP to produce guanosine monophosphate (GMP) with equimolar affinity and high intrinsic rates of hydrolyzation. The physiological relevance of the GBP's GDPase activity might yield important insights to elucidate GBP-specific defensive profile versus other INF-induced GTPases(e.g.IRGs). Evidence has suggested GBPs as important players in a variety of disease conditions ranging from infectious and metabolic inflammatory diseases to cancer, In the context of cell protection against bacteria, early efforts conducting loss-function assays revealed a reduced host resistance to several pathogens when lacking GBPs. More recent studies have indicated that GBPs appear to be an agent that disturbs the structural integrity of bacteria, stimulates inflammasome signaling, forms complexes on pathogen-containing vesicles in infected cells, and fosters autophagy and oxidative mechanisms helping pathogen clearance. Human GBP1 is secreted from cells without the need of a leader peptide, and has been shown to exhibit antiviral activity against Vesicular stomatitis virus and Encephalomyocarditis virus, as well as being able to regulate the inhibition of proliferation and invasion of endothelial cells in response to IFN-gamma. GBP1, the most widely studied GBP, has been studied for its antimicrobial properties. It can effectively polymerize and target the lipopolysaccharide cell wall of gram-negative bacteria. In said bacteria type, the GBP1 polymer coating alters the lipopolysaccharide membrane, allowing access to other parts of the membrane by other innate antimicrobial agents within the cell to cause pathogen cell death. Besides detecting pathogens and causing bacterial cell lysis, GBP1 can also cause host-programmed cell death. The GBP family of proteins is highly conserved among many different phyla. They are believed to be a shared gene family that is used to fight off mostly viral, parasitic, and bacterial infections. On that note, the expression of GBPs is noted to increase in humans once the body detects many different types of diseases ranging from the infections listed above to cancer. Due to the similarity between murine and human GBPs, mouse knockout studies have been utilized to investigate the different roles GBPs have in fighting off other diseases. These studies have confirmed that knocking out different GBPs has different effects on combating different infections.

References

Illustrations

Worked examples

Example 1 — a first encounter with Guanylate-binding protein

Start with the simplest possible case. Write down what Guanylate-binding 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 Guanylate-binding 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 Guanylate-binding 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 Guanylate-binding protein

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

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

Frequently asked questions

What is Guanylate-binding protein in simple terms?

Why does Guanylate-binding 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 Guanylate-binding 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 Guanylate-binding protein.