Kanamycin A

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Not to be confused with kanamycin B.
Kanamycin A
Names
  • 2-(aminomethyl)- 6-[4,6-diamino-3- [4-amino-3,5-dihydroxy-6-(hydroxymethyl) tetrahydropyran-2-yl]oxy- 2-hydroxy- cyclohexoxy]- tetrahydropyran- 3,4,5-triol
Clinical data
Main usesSevere bacterial infections, tuberculosis[1]
Side effectsHearing and balance problems[1]
Pregnancy
category
  • D
Routes of
use		By mouth, intravenous, intramuscular
Defined daily dose1 gram [2]
External links
AHFS/Drugs.comMonograph
Pharmacokinetics
Bioavailabilityvery low after by mouth delivery
MetabolismUnknown
Elimination half-life2 hours 30 minutes
ExcretionUrine (as unchanged drug)
Chemical and physical data
FormulaC18H36N4O11
Molar mass484.499 g·mol−1
3D model (JSmol)
  • O([C@@H]2[C@@H](O)[C@H](O[C@H]1O[C@H](CN)[C@@H](O)[C@H](O)[C@H]1O)[C@@H](N)C[C@H]2N)[C@H]3O[C@@H]([C@@H](O)[C@H](N)[C@H]3O)CO
  • InChI=1S/C18H36N4O11/c19-2-6-10(25)12(27)13(28)18(30-6)33-16-5(21)1-4(20)15(14(16)29)32-17-11(26)8(22)9(24)7(3-23)31-17/h4-18,23-29H,1-3,19-22H2/t4-,5+,6-,7-,8+,9-,10-,11-,12+,13-,14-,15+,16-,17-,18-/m1/s1 checkY
  • Key:SBUJHOSQTJFQJX-NOAMYHISSA-N checkY

Kanamycin A, often referred to simply as kanamycin, is an antibiotic used to treat severe bacterial infections and tuberculosis.[1] It is not a first line treatment.[1] It is used by mouth, injection into a vein, or injection into a muscle.[1] Kanamycin is recommended for short-term use only, usually from 7 to 10 days.[1] As with most antibiotics, it is ineffective in viral infections.[1]

Common side effects include hearing and balance problems.[1] Kidney problems may also occur.[1] Kanamycin is not recommended during pregnancy as it may harm the baby.[1] It is likely safe during breastfeeding.[3] Kanamycin is in the aminoglycoside family of medications.[1] It works by blocking the production of proteins that are required for bacterial survival.[1]

Kanamycin was first isolated in 1957 by Hamao Umezawa from the bacterium Streptomyces kanamyceticus.[1][4] The eye drop is on the World Health Organization's List of Essential Medicines as an alternative to gentamicin.[5] The wholesale cost in the developing world is US$0.85–1.52 per dose as of 2014.[6] It is no longer marketed in the United States.[1]

Medical uses

Spectrum of activity

Kanamycin is indicated for short-term treatment of bacterial infections caused by one or more of the following pathogens: E. coli, Proteus species (both indole-positive and indole-negative), Enterobacter aerogenes, Klebsiella pneumoniae, Serratia marcescens, and Acinetobacter species. In cases of serious infection when the causative organism is unknown, Kanamycin injection in conjunction with a penicillin- or cephalosporin-type drug may be given initially before obtaining results of susceptibility testing.

Kanamycin does not treat viral infections.[7]

Pregnancy and breastfeeding

Kanamycin is pregnancy category D in the United States.[7]

Kanamycin enters breast milk in small amounts. The manufacturer therefore advises that people should either stop breastfeeding or kanamycin. The American Academy of Pediatrics considers kanamycin okay in breastfeeding.[8]

Children

Kanamycin should be used with caution in newborns due to the risk of increased drug concentration resulting from immature kidney function.[7]

Dosage

The defined daily dose is 1 gram (parenteral)[2]

Side effects

Serious side effects include ringing in the ears or loss of hearing, toxicity to kidneys, and allergic reactions to the drug.[9]

Other side effects include:[7]

Gastrointestinal effects

  • Nausea, vomiting, diarrhea

Musculoskeletal effects

  • Myasthenia gravis

Neurologic effects

  • Headache
  • Paresthesias
  • Blurring of vision
  • Neuromuscular blockade

Metabolic effects

  • Malabsorption syndrome

Mechanism

Kanamycin works by interfering with protein synthesis. It binds to the 30S subunit of the bacterial ribosome. This results in incorrect alignment with the mRNA and eventually leads to a misread that causes the wrong amino acid to be placed into the peptide. This leads to nonfunctional peptide chains.[10]

Composition

Kanamycin is a mixture of three main components: kanamycin A, B, and C. Kanamycin A is the major component in kanamycin.[11] The effects of these components do not appear to be widely studied as individual compounds when used against prokaryotic and eukaryotic cells.

Biosynthesis

View of superimposed kanamycin A substrates in AAC(6’)-Im &-Ib

While the main product produced by Streptomyces kanamyceticus is kanamycin A, additional products are also produced, including kanamycin B, kanamycin C, kanamycin D and kanamycin X.

The kanamycin biosynthetic pathway can be divided into two parts. The first part is common to several aminoglycoside antibiotics, such as butirosin and neomycin. In it a unique aminocyclitol, 2-deoxystreptamine, is biosynthesized from D-glucopyranose 6-phosphate in four steps. At this point the kanamycin pathway splits into two branches due to the promiscuity of the next enzyme, which can utilize two different glycosyl donors - UDP-N-acetyl-α-D-glucosamine and UDP-α-D-glucose. One of the branches forms kanamycin C and kanamycin B, while the other branch forms kanamycin D and kanamycin X. However, both kanamycin B and kanamycin D can be converted to kanamycin A, so both branches of the pathway converge at kanamycin A.[12]

Use in research

Kanamycin is used in molecular biology as a selective agent most commonly to isolate bacteria (e.g., E. coli) which have taken up genes (e.g., of plasmids) coupled to a gene coding for kanamycin resistance (primarily Neomycin phosphotransferase II [NPT II/Neo]). Bacteria that have been transformed with a plasmid containing the kanamycin resistance gene are plated on kanamycin (50-100 ug/ml) containing agar plates or are grown in media containing kanamycin (50-100 ug/ml). Only the bacteria that have successfully taken up the kanamycin resistance gene become resistant and will grow under these conditions. As a powder, kanamycin is white to off-white and is soluble in water (50 mg/ml).

At least one such gene, Atwbc19[13] is native to a plant species, of comparatively large size and its coded protein acts in a manner which decreases the possibility of horizontal gene transfer from the plant to bacteria; it may be incapable of giving resistance to bacteria even if gene transfer occurs.

KanMX marker

The selection marker kanMX is a hybrid gene consisting of a bacterial aminoglycoside phosphotransferase (kanr from transposon Tn903) under control of the strong TEF promoter from Ashbya gossypii.[14][15]

Mammalian cells, yeast, and other eukaryotes acquire resistance to geneticin (= G418, an aminoglycoside antibiotic similar to kanamycin) when transformed with a kanMX marker. In yeast, the kanMX marker avoids the requirement of auxotrophic markers. In addition, the kanMX marker renders E. coli resistant to kanamycin. In shuttle vectors the KanMX cassette is used with an additional bacterial promoter. Several versions of the kanMX cassette are in use, e.g. kanMX1-kanMX6. They primarily differ by additional restriction sites and other small changes around the actual open reading frame.[14][16]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 "Kanamycin Sulfate". The American Society of Health-System Pharmacists. Archived from the original on 10 September 2017. Retrieved 6 December 2016.
  2. ↑ 2.0 2.1 "WHOCC - ATC/DDD Index". www.whocc.no. Archived from the original on 1 July 2021. Retrieved 21 September 2020.
  3. ↑ "Kanamycin (Kantrex) Use During Pregnancy". www.drugs.com. Archived from the original on 20 December 2016. Retrieved 7 December 2016.
  4. ↑ Sneader, Walter (2005). Drug Discovery: A History. John Wiley & Sons. p. 302. ISBN 9780471899792. Archived from the original on 20 December 2016. Retrieved 7 December 2016.
  5. ↑ World Health Organization (2023). The selection and use of essential medicines 2023: web annex A: World Health Organization model list of essential medicines: 23rd list (2023). Geneva: World Health Organization. hdl:10665/371090. WHO/MHP/HPS/EML/2023.02.
  6. ↑ "Kanamycin Sulfate". International Drug Price Indicator Guide. Archived from the original on 22 January 2018. Retrieved 7 December 2016.
  7. ↑ 7.0 7.1 7.2 7.3 "Kanamycin (By injection)". Archived from the original on 2017-09-10.
  8. ↑ Briggs, Gerald (2011). Drugs in Pregnancy and Lactation: A Reference Guide to Fetal and Neonatal Risk. Lippincott Williams & Wilkins. p. 787.
  9. ↑ Consumer Drug Information: Kanamycin, 2 April 2008, archived from the original on 3 May 2008, retrieved 2008-05-04
  10. ↑ "Kanamycin". DrugBank. 2016-08-17. Archived from the original on 8 November 2016. Retrieved 7 November 2016.
  11. ↑ "Kanamycin". PubChem. U.S. National Library of Medicine. Archived from the original on 11 May 2020. Retrieved 6 February 2020.
  12. ↑ "kanamycin biosynthesis pathway". MetaCyc. Archived from the original on 20 September 2018. Retrieved 30 September 2014.
  13. ↑ "Horizontal Gene Transfer: Plant vs. Bacterial Genes for Antibiotic Resistance Scenario's—What's the Difference?". Isb.vt.edu. Archived from the original on 2013-06-06. Retrieved 2013-06-24.
  14. ↑ 14.0 14.1 Wach A, Brachat A, Pöhlmann R, Philippsen P (December 1994). "New heterologous modules for classical or PCR-based gene disruptions in Saccharomyces cerevisiae". Yeast. 10 (13): 1793–808. doi:10.1002/yea.320101310. PMID 7747518.
  15. ↑ Steiner S, Philippsen P (February 1994). "Sequence and promoter analysis of the highly expressed TEF gene of the filamentous fungus Ashbya gossypii". Molecular & General Genetics. 242 (3): 263–71. doi:10.1007/BF00280415. PMID 8107673. Archived from the original on 28 August 2021. Retrieved 6 February 2020.
  16. ↑ Wach A (March 1996). "PCR-synthesis of marker cassettes with long flanking homology regions for gene disruptions in S. cerevisiae". Yeast. 12 (3): 259–65. doi:10.1002/(SICI)1097-0061(19960315)12:3<259::AID-YEA901>3.0.CO;2-C. PMID 8904338.

External links

Identifiers:
  • "Kanamycin A". Drug Information Portal. U.S. National Library of Medicine. Archived from the original on 2 August 2020. Retrieved 16 March 2020.
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