ArticleslgStudy

biology

TMLHE

TMLHE 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 TMLHE rather than just read about it. In short: Trimethyllysine dioxygenase, mitochondrial is an enzyme that in humans is encoded by the TMLHE gene in chromosome X. Mutations in the TMLHE gene resulting in carnitine biosynthesis disruption have been associated with autism symptoms.

TMLHE — main illustration
TMLHE — illustration

Key takeaways

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

Reference excerpt

Trimethyllysine dioxygenase, mitochondrial is an enzyme that in humans is encoded by the TMLHE gene in chromosome X. Mutations in the TMLHE gene resulting in carnitine biosynthesis disruption have been associated with autism symptoms.

Structure The TMHLE gene is located at the extreme end of the Xq28 region with high genomic instability, and encodes a protein trimethyllysine dioxygenase, a, Fe2+ and 2-oxoglytarate dependent non-heme-ferrous iron hydrolase localized to the mitochondrial matrix.

Function The trimethyllysine dioxygenase enzyme catalyzes the first step in the carnitine biosynthesis pathway, which is part of amine biosynthesis. Carnitine is a molecule that play an essential role in the transport of activated fatty acids across the inner mitochondrial membrane where they are metabolized. The encoded protein converts trimethyllysine into hydroxytrimethyllysine with the reaction (EC 1.14.11.8): N6,N6,N(6)-trimethyl-L-lysine + 2-oxoglutarate + O2 = 3-hydroxy-N6,N6,N(6)-trimethyl-L-lysine + succinate + CO2 and requires iron and L-ascorbate as co-factors.

Clinical significance Mutations in the TMLHE gene cause epsilon-trimethyllysine hydroxylase deficiency (TMLHED), an inborn error of metabolism in carnitine biosynthesis, which may increase the risks of developing neurodevelopmental disorders, autism-related behaviors, and autism spectrum disorders.

Interactions TMLHE has been shown to have 14 binary protein-protein interactions including 12 co-complex interactions. TMLHE appears to interact with SUGCT.

References

Further reading

Illustrations

TMLHE illustration
TMLHE illustration

Worked examples

Example 1 — a first encounter with TMLHE

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

In research
TMLHE 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 TMLHE 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
TMLHE is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome X, Protein stubs, so understanding it makes those chapters shorter.
In everyday life
Look for TMLHE 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.

Affiliate

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

How to study TMLHE in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what TMLHE means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain TMLHE out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is TMLHE in simple terms?

Trimethyllysine dioxygenase, mitochondrial is an enzyme that in humans is encoded by the TMLHE gene in chromosome X. Mutations in the TMLHE gene resulting in carnitine biosynthesis disruption have been associated with autism symptoms.

Why does TMLHE 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 TMLHE?

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 TMLHE.

Tags

  • Genes on human chromosome X
  • Protein stubs

Keep exploring