biology

KLF3

KLF3 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 KLF3 rather than just read about it. In short: Krüppel-like factor 3 is a protein that in humans is encoded by the KLF3 gene. Structure KLF3, originally termed Basic Krüppel-like Factor (BKLF), was the third member of the Krüppel-like factor family of zinc finger transcription factors to be discovered.

Key takeaways

KLF3 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect KLF3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of KLF3 from memory before moving on to harder problems.

Reference excerpt

Krüppel-like factor 3 is a protein that in humans is encoded by the KLF3 gene.

Structure KLF3, originally termed Basic Krüppel-like Factor (BKLF), was the third member of the Krüppel-like factor family of zinc finger transcription factors to be discovered. Transcription factors in this family bind DNA by virtue of 3 characteristic three C2H2 zinc fingers at their C-termini. Since their DNA-binding domains are highly conserved within the family, all KLF proteins recognize CACCC or CGCCC boxes of the general form NCR CRC CCN, (where N is any base and R is a purine).

Function While the C-termini are similar in different KLFs, the N-termini vary and accordingly different KLFs can either activate or repress transcription or both. KLF3 appears to function predominantly as a repressor of transcription. It turns genes off. It does this by recruiting the C-terminal Binding Protein co-repressors CTBP1 and CTBP2. CtBP docks onto a short motif (residues 61-65) in the N-terminus of KLF3, of the general form Proline – Isoleucine – Aspartate – Leucine – Serine (the PIDLS motif). CtBP in turn recruits histone modifying enzymes to alter chromatin and repress gene expression. KLF3 is expressed highly in the red blood cell or erythroid lineage. Here it is driven by another KLF, Erythroid KLF or KLF1, and its expression increases as erythroid cells mature. Studies in knockout mice reveal a mild anemia in the absence of functional KLF3 and the de-repression of several target genes that contain CACCC boxes in their regulatory regions. Many of these genes are activated by KLF1, hence it appears that KLF3 operates in a negative feedback loop to balance the activating potential of KLF1. KLF3 also regulates another repressive KLF, KLF8. Thus KLF1, KLF3 and KLF8 operate in a tight regulatory network. KLF3 and KLF8 may have redundant functions, as mice lacking both KLF3 and KLF8 show defects that are more severe than in either single knockout. They die in utero around day 14 of gestation. As well as being expressed in erythroid cells, KLF3 is present in other cell types and analysis of the knockout mice has revealed defects affecting adipose tissue and B cells. KLF3 deficient mice have less adipose tissue and indications of metabolic health that may be attributable to de-repression of the adipokine hormone gene adipolin. The role of KLF3 in B lymphocytes is complex but it appears to operate in a network with KLF2 and KLF4 to influence the switch between spleen marginal zone and follicular B cells.

Interactions KLF3 has been shown to interact with:

CTBP2 and FHL3.

References

Illustrations

Worked examples

Example 1 — a first encounter with KLF3

Start with the simplest possible case. Write down what KLF3 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 KLF3 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 KLF3 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 KLF3

In research: KLF3 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 KLF3 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: KLF3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 4, Transcription factors, so understanding it makes those chapters shorter.
In everyday life: Look for KLF3 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “KLF3” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study KLF3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what KLF3 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 KLF3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is KLF3 in simple terms?

Krüppel-like factor 3 is a protein that in humans is encoded by the KLF3 gene. Structure KLF3, originally termed Basic Krüppel-like Factor (BKLF), was the third member of the Krüppel-like factor family of zinc finger transcription factors to be discovered.

Why does KLF3 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 KLF3?

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 KLF3.