science

Phosphatidylinositol-4-phosphate 5-kinase

Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase rather than just read about it. In short: Phosphatidylinositol-4-phosphate 5-kinases (PIP5Ks, or PI4P5Ks) are a class of enzymes that phosphorylate phosphatidylinositol 4-phosphate. They perform this reaction on the fifth hydroxyl of the myo-inositol ring to form phosphatidylinositol 4,5-bisphosphate.

Key takeaways

Phosphatidylinositol-4-phosphate 5-kinase belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Phosphatidylinositol-4-phosphate 5-kinase to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Phosphatidylinositol-4-phosphate 5-kinase from memory before moving on to harder problems.

Reference excerpt

Phosphatidylinositol-4-phosphate 5-kinases (PIP5Ks, or PI4P5Ks) are a class of enzymes that phosphorylate phosphatidylinositol 4-phosphate. They perform this reaction on the fifth hydroxyl of the myo-inositol ring to form phosphatidylinositol 4,5-bisphosphate.

Function

Phosphatidylinositol 4-Phosphate-5 kinase (PI4P5K) or PIP5K or PI5K family regulates diverse cellular processes such as G protein-coupled receptor(GPCR) signaling, vesicle trafficking, chemotaxis and cellular movement. There are at least two types of PIP5K found which includes Type I and Type II. Reinvestigation of the substrate specificity of PI(4)P5Ks, however, revealed that the type II PI(4)P5Ks catalyze phosphorylation of a novel phosphoinositide phosphati- dylinositol 5-phosphate at the D-4 position of the inositol ring, leading to the revised conclusion that the type II enzymes are actually phosphatidylinositol 5-phosphate 4-kinases. Thus, the PI(4)P5K family now comprises just the type I􏰂.Other types are also suspected in the nervous system but have not been well reported. These enzyme synthesize diverse Phosphatidyl Inositol 4,5 bisphosphate ( PI(4,5)P2 ) by phosphorylating the D- 5 position of the inositol ring of Phosphatidylinositol 4-phosphate]. PIP5KI is the most extensively studied and is synthesizing for most of the PI(4,5)P2 pool the cell. Type I phosphatidylinositol-4-phosphate 5-kinase (PIP5KI) are further classified as PIP5Kα, PIP5Kβ and PIP5Kγ on the basis of their basic differences in primary structure and the variation in the expression level in different compartment of cells, indicating that individual PIP5KI isoform has non identical function [5]. Moreover, PIP5Kγ, has three splicing variance; PIP5Kγ635, PIP5γ661, and PIP5Kγ687, making it one of the key regulators for producing PI(4,5)P2 that plays a role in diverse cellular processes. Although an extensive study to elucidate the role of PI(4,5)P2 and PIP5 kinase has been focused on many cellular processes such as vesicle trafficking, cell movement and cytoskeletal assembly, a very few studies have been reported for their role in neuronal development. PIP5K is highly expressed kinase in the nervous system of several organisms and plays important role in neuronal development including embryogenesis and post-natal neural development. The disruption of PIP5KIγ leads to broad developmental and cellular defects in mice indicating PIP5KIγ plays critical role for embryogenesis and adulthood of mice and its disruption causes fatality for postnatal life []. The embryo without PIP5KIγ has extensive prenatal lethality during embryonic development. The disruption of PIP5KIγ also causes neural tube closure defects caused by decreased PI(4,5)P2 level. In contrast to this, mice lacking PIPKIα or PIPKIβ have major impact during adulthood but no effect in prenatal embryo, Even in the absence of both PIPKIα and PIPKIβ, a single allele of PIPKIγ, can support normal the adulthood functioning, indicating PIPKIγ and PIPKIα have partially overlapping function during embryogenesis. In different experiments, the role of PIP5K in neurite outgrowth has been analyzed by knocking down PIP5Kα. The Nerve Growth Factor (NGF) induced neurite outgrowth was more obvious in knock down cells than in control cells. In contrary, the over-expression of PIP5Ka in to a PIP5Ka Knock down cells abrogated neurite outgrowth showing PIP5K acts as a negative regulator of NGF-induced neurite outgrowth through inhibiting the PI3K/ AKT signaling pathway in PC12 cells. A novel mechanism for the role of PIPKIα in regulating neuronal morphology by controlling microtubule dynamics is reported in mouse. During axon pathfinding, a growth cone is formed to guide the migrating axon. Growth cone formation is induced by Kinesin Supar Family protein 2A (KIF2A) KIF2A- mediated depolymerization of microtubules. The interaction of PIPKα with KIF2A suppresses the elongation of axon branches. In association with Daam2, PIP5 kinase promotes Wnt signaling and receptor complex formation which is required for the regenerative myelination of the neuron. In the central nervous system (CNS) of chick, PIP5K-PI(4,5)P2 mediated role of Daam2 has been reported for the development of neurons.

List of PIP4Ks Phosphatidylinositol-5-phosphate 4-kinase type-2 alpha (PIP4K2A) Phosphatidylinositol-5-phosphate 4-kinase type-2 beta (PIP4K2B) Phosphatidylinositol-5-phosphate 4-kinase type-2 gamma (PIP4K2C)

References

Illustrations

Worked examples

Example 1 — a first encounter with Phosphatidylinositol-4-phosphate 5-kinase

Start with the simplest possible case. Write down what Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase

In research: Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase 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: Phosphatidylinositol-4-phosphate 5-kinase is common in secondary-school and first-year university syllabi. It links to neighbouring topics Phospholipids, so understanding it makes those chapters shorter.
In everyday life: Look for Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Phosphatidylinositol-4-phosphate 5-kinase in simple terms?

Why does Phosphatidylinositol-4-phosphate 5-kinase 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 Phosphatidylinositol-4-phosphate 5-kinase?

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 Phosphatidylinositol-4-phosphate 5-kinase.