biology

NFE2L3

NFE2L3 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 NFE2L3 rather than just read about it. In short: Nuclear factor (erythroid 2)-like factor 3, also known as NFE2L3 or 'NRF3', is a transcription factor that in humans is encoded by the Nfe2l3 gene. Nrf3 is a basic leucine zipper (bZIP) transcription factor belonging to the Cap 'n' Collar (CNC) family of proteins.

Key takeaways

NFE2L3 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NFE2L3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NFE2L3 from memory before moving on to harder problems.

Reference excerpt

Nuclear factor (erythroid 2)-like factor 3, also known as NFE2L3 or 'NRF3', is a transcription factor that in humans is encoded by the Nfe2l3 gene. Nrf3 is a basic leucine zipper (bZIP) transcription factor belonging to the Cap 'n' Collar (CNC) family of proteins. In 1989, the first CNC transcription factor NFE2L2 was identified. Subsequently, several related proteins were identified, including NFE2L1 and NFE2L3, in different organisms such as humans, mice, and zebrafish. These proteins are specifically encoded in the humans by Nfe2l1 and Nfe2l3 genes respectively.

Gene The Nfe2l3 gene was mapped to the chromosomal location 7p15-p14 by fluorescence in situ hybridization (FISH). It covers 34.93 kB from base 26191830 to 26226754 on the direct DNA strand with an exon count of 4. The gene is found near the HOXA gene cluster, similar to the clustering of p45 NF-E2, NFE2L1, and NFE2L2 near HOXC, HOXB, and HOXD genes respectively. This implies that all four genes were likely derived from a single ancestral gene which was duplicated alongside the ancestral HOX cluster, diverging to give rise to four closely related transcription factors. The human Nfe2l3 gene encodes a 694 amino acid residue sequence. From bioinformatic analysis, it has been observed that the NRF3 protein shows a high degree of conservation through its evolutionary pathway from zebrafish to humans. Key conserved domains such as N-terminal homology box 1 (NHB1), N-terminal homology box 2 (NHB2), and the CNC domain allude to the conserved functional properties of this transcription factor.

Sub-cellular location NRF3 is a membrane bound glycoprotein that can be targeted specifically to the endoplasmic reticulum (ER) and the nuclear membrane. Biochemical studies have identified three migrating endogenous forms of NRF3 protein – A, B, and C – which are constitutively degraded by several proteolytic mechanisms. It is known that the "A" form is glycosylated, whereas "B" is unglycosylated, and "C" is generated by cleavage of "B." In total, seven potential sites of N-linked glycosylation has been observed in the center portion of the NRF3 protein. However, further details of the three forms' location, regulation, and function in each cellular compartment remain unknown.

Protein expression levels Expression levels of NRF3 proteins are highest in the placenta. more specifically in the chorionic villi (at week 12 of gestation period) Expression appears to be specific to primary placental cytotrophoblasts, not placental fibroblasts. Along with the placenta, the expression of this protein has also been observed in human choriocarcinoma cell lines which have been derived from trophoblastic tumours of the placenta. NFE2L2 has also been found in the heart, brain, lungs, kidney, pancreas, colon, thymus, leukocytes, and spleen. Very low levels of expression were found in human megakaryocytes and erythrocytes, and NRF3 expression was not observed in reproductive organs of either sex.

Function The specific functions of the NRF3 protein are still unknown, but some putative functional properties have been inferred from those of NFE2L1 due to their structural similarity. It is known that NRF3 can heterodimerize with small musculo-aponeurotic fibro-sarcoma (MAF genes) factors to bind antioxidant response elements in target genes.

Associated diseases RNA microarray data has shown NRF3's involvement in various malignancies, with over-expression observed in Hodgkin's lymphoma, non-Hodgkin lymphoma, and mantle cell lymphoma. NRF3 expression is also elevated in human breast cancer cells and testicular carcinoma, implying that NRF3 may play a role in inducing carcinogenesis.

References

Illustrations

Worked examples

Example 1 — a first encounter with NFE2L3

Start with the simplest possible case. Write down what NFE2L3 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 NFE2L3 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 NFE2L3 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 NFE2L3

In research: NFE2L3 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 NFE2L3 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: NFE2L3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 7, Transcription factors, so understanding it makes those chapters shorter.
In everyday life: Look for NFE2L3 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 NFE2L3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NFE2L3 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 NFE2L3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NFE2L3 in simple terms?

Why does NFE2L3 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 NFE2L3?

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 NFE2L3.