science

RVxP motif

RVxP motif 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 RVxP motif rather than just read about it. In short: RVxP motif is a protein motif involved in localizing proteins into cilia. Cilia are sensory organelle of cells, whose malfunction can cause diseases such as polycystic kidney disease, nephronophthisis and Bardet-Biedl syndrome.

Key takeaways

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

Reference excerpt

RVxP motif is a protein motif involved in localizing proteins into cilia. Cilia are sensory organelle of cells, whose malfunction can cause diseases such as polycystic kidney disease, nephronophthisis and Bardet-Biedl syndrome. Proteins employed in the cilia are targeted there when they bear specific entry signals, whereas proteins not situated in cilia are removed or prevented from entering the organelles. Entry signals have been found in ciliary/flagellar proteins of the protozoans Leishmania and Trypanosoma. The RVxP motif was first described for the PKD2 protein and when inserted in the transferrin receptor it can target it to cilia. It probably carries out its signal function through protein interactions although the exact process and where in the cell it takes place are unknown. Three candidate proteins involved in "receiving" this signal are pericentrin at the basal body of cilia, intraflagellar transport proteins such as IFT57 and ARF4 while the BBSome does not appear to interact with the sequence. The kinesins KIF17 is implicated in transporting the CNGB1 protein which has a RVxP motif into human cilia, as is Rab8a in transporting PKD2. Not all ciliary proteins use a RVxP motif for transport, however; VxPx and Ax(S/A)xQ have also been described as cilium-targeting motifs. Examples of proteins with RVxP motifs associated with cilia:

Mouse Ahi1, the homologue of human AHI1, fails to localize to cilia if its RVxP sequence is mutated. Caenorhabditis elegans Arl13b requires a RVxP motif to localize to cilia, a property shared by human ARL13B but in the latter case a coiled-coil domain is also needed. Human ATP1A4 has a motif similar to RVxP that may play a role in localizing the protein to sperm flagella. This sequence is conserved among species. Human CNGB1 features a C-terminal RVxP motif at amino acids 821-824 which if mutated causes the protein to not reach the cilia; other factors however are also needed. This motif is also found in animal CNGB1 homologues. Human CRMP2 has a RVxP motif but it does not appear to be required for its ciliar trafficking. Human FAM154A has a ciliary localization sequence. Tetrahymena GEF1 has a ciliary localization sequence and mutating it causes the protein to no longer localize to cilia. Human PDGFRA has a RVxP sequence and may localize to cilia thanks to it. Human PKD2 trafficking into cilia has been found in vitro to rely on a N-terminal RVxP motif as PKD2 mutants with alterations in this motif do not appear in cilia. This motif is also found in animal PKD2 homologues but not in Hydra. Mutating this sequence in mice knocked out for PKD1 causes PKD2 to accumulate at the foot of the cilia. Other proteins associated with cilia for which the occurrence of a RVxP motif has been discussed are PKD1 and PSEN2.

References

Sources

Worked examples

Example 1 — a first encounter with RVxP motif

Start with the simplest possible case. Write down what RVxP motif 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 RVxP motif 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 RVxP motif 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 RVxP motif

In research: RVxP motif 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 RVxP motif 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: RVxP motif is common in secondary-school and first-year university syllabi. It links to neighbouring topics Organelles, Short linear motifs, so understanding it makes those chapters shorter.
In everyday life: Look for RVxP motif 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 RVxP motif in 20 minutes

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

Frequently asked questions

What is RVxP motif in simple terms?

Why does RVxP motif 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 RVxP motif?

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 RVxP motif.