"Biochemical characterization of mammalian ELOVL7 demonstrates that it catalyzes the **condensation** of an **acyl‑CoA** (fatty acyl donor) with **malonyl‑CoA** (two-carbon donor) to yield a **3‑ketoacyl‑CoA**, which is then further processed by downstream elongation enzymes (reduction, dehydration, reduction) to produce an elongated acyl‑CoA."

"ELOVL7 belongs to the mammalian **ELOVL (elongation of very long-chain fatty acids)** family, which catalyzes the *rate-limiting first step* of microsomal fatty-acid elongation."

"In purified-enzyme assays (reconstituted into proteoliposomes), mammalian ELOVL7 shows activity toward **C16–C20** acyl‑CoA substrates, with the **highest activity toward C18 substrates**, and comparatively little/no activity toward longer saturated substrates (e.g., **C22–C26** saturated acyl‑CoAs) under the tested conditions."

"A particularly high activity was reported for **C18:3(n‑3)** and **C18:3(n‑6)** acyl‑CoAs."

"A hallmark of ELOVL family condensing enzymes is the conserved **HxxHH** motif. In mammalian ELOVL7, this motif is reported as **HVFHH**, and mutation to **HVFAA** abolishes activity, demonstrating that these histidines are essential for catalysis."

"Mammalian ELOVL7 is a **membrane-embedded elongase** associated with the **endoplasmic reticulum (ER)**. Experimentally, activity is **lost upon detergent solubilization** (e.g., Triton X‑100) and **restored upon reconstitution into phosphatidylcholine proteoliposomes**, indicating that correct membrane embedding/lipid bilayer context is required for functional catalysis."