biology

Matrilin-3

Matrilin-3 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 Matrilin-3 rather than just read about it. In short: Matrilin-3 is a protein that in humans is encoded by the MATN3 gene. It is linked to the development of many types of cartilage, and part of the Matrilin family, which includes Matrilin-1, Matrilin-2, Matrilin-3, and Matrilin-4, a family of filamentous-forming adapter oligomeric extracellular proteins that are linked to the formation of cartilage and bone, as well as maintaining homeostasis after development.

Key takeaways

Matrilin-3 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Matrilin-3 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Matrilin-3 from memory before moving on to harder problems.

Reference excerpt

Matrilin-3 is a protein that in humans is encoded by the MATN3 gene. It is linked to the development of many types of cartilage, and part of the Matrilin family, which includes Matrilin-1, Matrilin-2, Matrilin-3, and Matrilin-4, a family of filamentous-forming adapter oligomeric extracellular proteins that are linked to the formation of cartilage and bone, as well as maintaining homeostasis after development. It is considered an extracellular matrix protein that functions as an adapter protein where the Matrilin-3 subunit can form both homo-tetramers and hetero-oligomers with subunits from Matrilin-1 which is the cartilage matrix protein. This restricted tissue has been strongly expressed in growing skeletal tissue as well as cartilage and bone. The Matrilin-3 protein is protein linked to the development of cartilage and bone, and consists of one Von Willebrand Factor A domain, four epidermal growth factor domains, and a C-terminal coiled-coil domain. Matrilin-3 expression is mostly present in the development of cartilage prior to birth, and ceases to exist in adulthood unless linked with skeletal diseases like osteoarthritis, and chondrodysplasias like multiple epiphyseal dysplasia (MED) and spondyloepimetaphyseal dysplasia. The main function of Matrilin-3 is to enhance Collagen II and aggrecan expression which is essential in maintaining the elasticity and strength of cartilage.

Gene The matrilin-3 protein was assigned to chromosome region 2 (2p24 - p23) with the corresponding mRNA of 2.8kb which has been found expressed in every type of cartilage investigated. Matrilin-3 is arranged in 7 domains and is composed of 486 amino acid residues. The nucleotide sequence for Matrilin-3 in humans is 83% similar to the Matrilin-3 in mice, and 61% similar to that of chicken. The main differences between the different species differ mainly in the positively charged N-terminal domain, which is shorter in chicken compared to the Human Matrilin-3. The chicken Matrilin-3 also differs as it does not contain an insertion of a single aspartic acid residue in their four EGF -like domains, like in the human and mouse Matrilin-3 sequences.

Structure Each member of the Matrilin family consist of one or two Von Willebrand Factor A (vWFA) domains, several epidermal growth factor (EGF)- like domains, and an alpha-helical coiled-coil domain. Matrilin-3 does not contain the second vWFA -like domain that is present in the rest of the members of the Matrilin family. It is considered the shortest and least complex member of the family, consisting of only one Von Willebrand Factor A domain, four epidermal growth factor domains, and a C-terminal coiled-coil domain. The Matrilin-3 protein is considered a multimeric protein that can form bonds to triple helix collagens, decorin and biglycan, as it plays an important role as a linker molecule in the formation of the articular cartilage network.

Function The main function of Matrilin-3 is to enhance Collagen II and aggrecan expression which is essential in maintaining the elasticity and strength of cartilage. Not only does it maintain cartilage structure but also its function and disease development. Matrilin-3 is mainly expressed in cartilage before birth, unless linked to disease development during adulthood. In mice, Matrilin-3 is only expressed in the development of cartilage of the skeletal system. However, although Matrilin-1 continues to be expressed in tissues that remain cartilaginous throughout its life, Matrilin-3 is not presently expressed in these tissues after birth. Preliminary Immunoblot test result in the expression of Matrilin-3 being much higher in the fetal tissues than in adult. However, this does not mean that Matrilin-3 can not be expressed in mature cartilage. There is a strong correlation between strong Matrilin-3 gene expression and tissue damage. Strong Matrilin-3 gene expression has been consistently linked to development of osteoarthritis, which can develop from high levels of Matrilin-3 which tears down articular cartilage, resulting loss in not only the surface are but proliferating and hypertrophic areas. Matrilin-3 plays a crucial role in keeping structural integrity of cartilage an extracellular matrix, and has been shown to have increased levels in osteoarthritis, and is also expressed in bone under normal conditions. It is also regulates extracellular matrix components of bone. Matrilin-3 interacts with TGF-β and BMP-2 to maintain homeostasis for the extracellular matrix of cartilage, as well as maintain chondrocytes during development. The types of cartilage that Matrilin-3 has been observed in are cartilaginous tissue, which includes articular and epiphyseal cartilage, as well as in cartilaginous anlage of developing bones. Matrilin-3 is essential in the formation of collagen-dependent networks as it connects the collagen independent pericellular network and cells, forming the filamentous connections. In skeletal development, Matrilin-3 is involved in mesenchymal differentiation, de-differentiation, chondrocyte terminal differentiation, and bone mineral density maintenance.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Matrilin-3

Start with the simplest possible case. Write down what Matrilin-3 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 Matrilin-3 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 Matrilin-3 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 Matrilin-3

In research: Matrilin-3 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 Matrilin-3 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: Matrilin-3 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extracellular matrix proteins, Genes on human chromosome 2, so understanding it makes those chapters shorter.
In everyday life: Look for Matrilin-3 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 Matrilin-3 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Matrilin-3 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 Matrilin-3 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Matrilin-3 in simple terms?

Why does Matrilin-3 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 Matrilin-3?

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 Matrilin-3.