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File:Penicillin inhibition.svg

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Summary

Description
English: Diagram depicting formation of cross-links in the bacterial cell wall by a penicillin binding protein (PBP, an enzyme) and subsequent suicide inhibition by penicillin.

1. The bacterial cell wall consists of strands of repeating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) subunits. The NAM subunits have short peptide chains attached to them. (The exact composition of these can vary. The proximal alanine is usually L-ala and the distal two are usually D-ala.)

2. The PBP binds the peptide side chains and forms the cross-link with the expulsion of one D-Alanine from one peptide side chain. (See PBP_catalysis.svg for details.)

3. The PBP dissociates from the wall once the cross-link has been formed.

4. Penicillin is added to the system. It enters the active site of the PBP and reacts with the serine group that is important in its enzymatic activity.

5. The beta-lactam ring of penicillin (represented here as the top of the "P") is irreversibly opened during the reaction with the PBP. Penicillin remains covalently linked to the PBP and permanently blocks the active site.
Italiano: Diagramma raffigurante la formazione di legami incrociati nella parete cellulare batterica da parte di una proteina legante la penicillina e inibizione suicidia della penicillina .

1. La parete cellulare batterica è costituito da filamenti di subunità ripetute N -acetil-glucosammina (NAG) e acido N-acetilmuramico (NAM). Le subunità NAM portano corte catene peptidiche attaccate. (La composizione esatta è variabile. L'alanina prossimale è solitamente una L-Ala e la due distali sono di solito D-Ala.)

2. La proteina lega le catene laterali peptidiche e forma la reticolazione con l'espulsione di una D-alanina da una catena laterale.

3. La proteina dissocia dalla parete una volta formato il reticolo.

4. Se penicillina viene aggiunto al sistema, essa entra nel sito attivo della proteina e reagisce con il gruppo serina il quale è importante per lattività enzimatica.

5. L'anello beta-lattamico della penicillina (qui rappresentato in rosso sulla "P") è irreversibilmente aperto durante la reazione con il proteina e rimanendo covalentemente ne blocca permanentemente il sito attivo.
Date
Source Own work
Author Mcstrother
Other versions

[edit]

  • Cross-linking of bacteria cell wall with no antibiotics.
    Cross-linking of bacteria cell wall with no antibiotics.
  • Action of penicillin
    Action of penicillin
  • Resistance to penicillin via modified cross-linking enzyme.
    Resistance to penicillin via modified cross-linking enzyme.
  • Action of vancomycin and resistance via alteration of peptide side-chains.
    Action of vancomycin and resistance via alteration of peptide side-chains.
  • Spanish version.
    Spanish version.
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Date/TimeThumbnailDimensionsUserComment
current00:39, 10 September 2011Thumbnail for version as of 00:39, 10 September 20111,157 × 1,813 (1.34 MB)McstrotherCorrected errors in mechanism of cross-linking.
04:03, 3 May 2011Thumbnail for version as of 04:03, 3 May 20111,157 × 1,813 (1.09 MB)McstrotherChanged all fonts from "Sans" to "Liberation Sans" to fix overlap issues.
03:42, 10 April 2011Thumbnail for version as of 03:42, 10 April 20111,157 × 1,813 (1.09 MB)McstrotherChanged color of carbohydrate chain.
06:42, 7 March 2011Thumbnail for version as of 06:42, 7 March 20111,157 × 1,813 (1.08 MB)Mcstrother{{Information |Description ={{en|1=Diagram depicting formation of cross-links in the bacterial cell wall by a penicillin binding protein (PBP, an enzyme) and subsequent suicide inhibition by penicillin. 1. The bacterial cell wall consists of strands o

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