biology

SUCLG1

SUCLG1 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 SUCLG1 rather than just read about it. In short: Succinyl-CoA ligase [GDP-forming] subunit alpha, mitochondrial is an enzyme that in humans is encoded by the SUCLG1 gene. Structure The enzyme encoded by SUCLG1 can exist in either a phosphorylated form or a dephosphorylated form.

Key takeaways

SUCLG1 belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SUCLG1 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SUCLG1 from memory before moving on to harder problems.

Reference excerpt

Succinyl-CoA ligase [GDP-forming] subunit alpha, mitochondrial is an enzyme that in humans is encoded by the SUCLG1 gene.

Structure The enzyme encoded by SUCLG1 can exist in either a phosphorylated form or a dephosphorylated form. In the dephosphorylated structure, a phosphate ion works in coordination with a histidine residue in the active site and the two alpha helices, one contributed by each subunit of the alphabeta-dimer to stabilize the structure. One of the alpha helices contains amino acids, the modification of which result in conformational changes that accommodate either the bound phosphoryl group or the free phosphate ion.

Function This gene encodes the alpha subunit of the heterodimeric enzyme succinate coenzyme A ligase. This enzyme is targeted to the mitochondria and catalyzes the conversion of succinyl CoA and ADP or GDP to succinate and ATP or GTP. Mutations in this gene are the cause of the metabolic disorder fatal infantile lactic acidosis and mitochondrial DNA depletion.

Clinical significance Succinate-CoA ligase deficiency is responsible for encephalomyopathy with mitochondrial DNA depletion and mild methylmalonic aciduria. Mutations in SUCLG1 lead to complete absence of SUCLG1 protein and are responsible for a very severe disorder with antenatal manifestations. Furthermore, it is shown that in the absence of SUCLG1 protein, no SUCLA2 protein is found in fibroblasts by western blot analysis. This result is consistent with a degradation of SUCLA2 when its heterodimer partner, SUCLG1, is absent. As mitochondrial DNA depletion in muscle is not a constant finding in SUCLG1 patients, diagnosis should not be based on it; additionally, it may be that alternative physiopathological mechanisms may be considered to explain the combined respiratory chain deficiency observed in these patients.

Interactive pathway map Click on genes, proteins and metabolites below to link to respective articles.

References

Illustrations

Worked examples

Example 1 — a first encounter with SUCLG1

Start with the simplest possible case. Write down what SUCLG1 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 SUCLG1 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 SUCLG1 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 SUCLG1

In research: SUCLG1 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 SUCLG1 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: SUCLG1 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Genes on human chromosome 2, Human chromosome 2 gene stubs, so understanding it makes those chapters shorter.
In everyday life: Look for SUCLG1 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 SUCLG1 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SUCLG1 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 SUCLG1 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SUCLG1 in simple terms?

Succinyl-CoA ligase [GDP-forming] subunit alpha, mitochondrial is an enzyme that in humans is encoded by the SUCLG1 gene. Structure The enzyme encoded by SUCLG1 can exist in either a phosphorylated form or a dephosphorylated form.

Why does SUCLG1 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 SUCLG1?

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 SUCLG1.