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<p>Pregnenolone was biotransformed by the plant-associated fungus <i>Bulbithecium</i> sp. (GSBT E3) under optimised physicochemical conditions. The resulting metabolites were isolated and structurally characterised using nuclear magnetic resonance (NMR) and high-resolution mass spectrometry (HRMS). Three transformed steroidal metabolites were identified: 11β,17α,21-trihydroxypregn-4-ene-3,20-dione (<b>I</b>), 17α-hydroxyprogesterone (<b>III</b>), and pregna-4,17-diene-3,16-dione (<b>IV</b>). Compound <b>II</b> (3-hydroxypregn-5-en-20-one) corresponded to the residual substrate. Among the transformed products, compounds <b>I</b> and <b>IV</b> exhibited structural modifications that were uncommon compared with reported fungal pregnenolone biotransformations. Selected metabolites were further evaluated using Endocrine Disruptome, SwissADME, AdmetSAR 3.0, and PASS online. These findings are preliminary and should be interpreted as hypothesis-generating rather than evidence of biological activity. Overall, <i>Bulbithecium</i> sp. (GSBT E3) functioned as a selective fungal biocatalyst for the transformation of pregnenolone and generated structurally characterised metabolites suitable for future mechanistic and bioactivity studies.</p>

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Pregnenolone biotransformation by a plant-associated Bulbithecium sp. GSBT E3 and in silico insights

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Prathyash Ushus Mancheary John,
  • Siva Kumar Kandula,
  • Koteswari Peddi,
  • Satyanarayana Swamy Cheekatla,
  • Shilha Madhuri Tanguturi,
  • Suresh Maddila,
  • Bijoy P. Mathew,
  • Muddukrishnaiah Kotakonda,
  • Suresh Reddy Kachireddy Venkata Naga,
  • Balamurali Karri,
  • Venkata Satya Mahesh Kumar Metta

摘要

Pregnenolone was biotransformed by the plant-associated fungus Bulbithecium sp. (GSBT E3) under optimised physicochemical conditions. The resulting metabolites were isolated and structurally characterised using nuclear magnetic resonance (NMR) and high-resolution mass spectrometry (HRMS). Three transformed steroidal metabolites were identified: 11β,17α,21-trihydroxypregn-4-ene-3,20-dione (I), 17α-hydroxyprogesterone (III), and pregna-4,17-diene-3,16-dione (IV). Compound II (3-hydroxypregn-5-en-20-one) corresponded to the residual substrate. Among the transformed products, compounds I and IV exhibited structural modifications that were uncommon compared with reported fungal pregnenolone biotransformations. Selected metabolites were further evaluated using Endocrine Disruptome, SwissADME, AdmetSAR 3.0, and PASS online. These findings are preliminary and should be interpreted as hypothesis-generating rather than evidence of biological activity. Overall, Bulbithecium sp. (GSBT E3) functioned as a selective fungal biocatalyst for the transformation of pregnenolone and generated structurally characterised metabolites suitable for future mechanistic and bioactivity studies.