PACTAMYCIN: A COMPREHENSIVE REVIEW OF ITS BIOLOGICAL ACTIVITY, BIOSYNTHESIS, AND SYNTHETIC STRATEGIES IN THE FIGHT AGAINST ANTIBIOTIC RESISTANCE
Bibliographic record
Abstract
Pactamycin, an aminocyclopentitol antibiotic, has garnered significant attention due to its dual efficacy as an antimicrobial and antitumor agent. Initially isolated from Streptomyces pactum var. pactum during the "Golden Age" of antibiotics in the 1960s, pactamycin exhibits potent activity against both Gram-positive and Gram-negative bacteria, positioning it as a promising candidate in the fight against antibiotic resistance. Its complex structure, characterized by a cyclopentane core with multiple stereogenic centers and a triamino motif, poses challenges for synthetic chemists aiming to produce this compound and its analogues. Recent advances in understanding the biosynthesis of pactamycin have revealed that it is assembled from three distinct cyclic fragments derived from glucose and acetic acid through independent metabolic pathways. This has provided insights for engineering new derivatives with enhanced biological properties. Structure-activity relationship (SAR) studies have identified critical features influencing biological activity, leading to derivatives with improved selectivity and reduced cytotoxicity. The emergence of nitrene chemistry has facilitated innovative synthetic methodologies, allowing for the efficient generation of pactamycin analogues through controlled C-H amination and aziridination reactions. This article explores the biological structures and activities of pactamycin, its biosynthetic pathways, mechanisms of action, and recent synthetic advancements. By synthesizing knowledge from various disciplines, we aim to provide a comprehensive overview of pactamycin's significance in contemporary medicinal chemistry and its potential role in addressing urgent health challenges, including antibiotic resistance and cancer treatment. As researchers continue to explore the therapeutic potential of pactamycin, its study exemplifies the vital intersection of natural product chemistry and synthetic innovation in the quest for new drugs.Original Article: https://www.researchgate.net/publication/390695757_PACTAMYCIN_A_COMPREHENSIVE_REVIEW_OF_ITS_BIOLOGICAL_ACTIVITY_BIOSYNTHESIS_AND_SYNTHETIC_STRATEGIES_IN_THE_FIGHT_AGAINST_ANTIBIOTIC_RESISTANCE/link/67f925fddf0e3f544f40b65d/download?_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6InB1YmxpY2F0aW9uIiwicGFnZSI6InB1YmxpY2F0aW9uIn19This version is archived in the Arab International University (AIU) repository for open access and dissemination purposes. The content of this paper has not been modified from the original publication.For more information, please visit the official repository of Arab International University (AIU):https://aiu.edu.sy
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".