|
|
| Line 10: |
Line 10: |
| == Function == | | == Function == |
| [https://www.uniprot.org/uniprot/NAGZ_PSEAE NAGZ_PSEAE] Plays a role in peptidoglycan recycling by cleaving the terminal beta-1,4-linked N-acetylglucosamine (GlcNAc) from peptide-linked peptidoglycan fragments, giving rise to free GlcNAc, anhydro-N-acetylmuramic acid and anhydro-N-acetylmuramic acid-linked peptides.[HAMAP-Rule:MF_00364] | | [https://www.uniprot.org/uniprot/NAGZ_PSEAE NAGZ_PSEAE] Plays a role in peptidoglycan recycling by cleaving the terminal beta-1,4-linked N-acetylglucosamine (GlcNAc) from peptide-linked peptidoglycan fragments, giving rise to free GlcNAc, anhydro-N-acetylmuramic acid and anhydro-N-acetylmuramic acid-linked peptides.[HAMAP-Rule:MF_00364] |
| <div style="background-color:#fffaf0;">
| |
| == Publication Abstract from PubMed ==
| |
| The N-acetylglucosaminidase NagZ of Pseudomonas aeruginosa catalyzes the first cytoplasmic step in recycling of muropeptides, cell-wall-derived natural products. This reaction regulates gene expression for the beta-lactam resistance enzyme, beta-lactamase. The enzyme catalyzes hydrolysis of N-acetyl-beta-d-glucosamine-(1-->4)-1,6-anhydro-N-acetyl-beta-d-muramyl-peptide (1) to N-acetyl-beta-d-glucosamine (2) and 1,6-anhydro-N-acetyl-beta-d-muramyl-peptide (3). The structural and functional aspects of catalysis by NagZ were investigated by a total of seven X-ray structures, three computational models based on the X-ray structures, molecular-dynamics simulations and mutagenesis. The structural insights came from the unbound state and complexes of NagZ with the substrate, products and a mimetic of the transient oxocarbenium species, which were prepared by synthesis. The mechanism involves a histidine as acid/base catalyst, which is unique for glycosidases. The turnover process utilizes covalent modification of D244, requiring two transition-state species and is regulated by coordination with a zinc ion. The analysis provides a seamless continuum for the catalytic cycle, incorporating large motions by four loops that surround the active site.
| |
|
| |
| Catalytic Cycle of the N-Acetylglucosaminidase NagZ from Pseudomonas aeruginosa.,Acebron I, Mahasenan KV, De Benedetti S, Lee M, Artola-Recolons C, Hesek D, Wang H, Hermoso JA, Mobashery S J Am Chem Soc. 2017 May 10. doi: 10.1021/jacs.7b01626. PMID:28482153<ref>PMID:28482153</ref>
| |
|
| |
| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
| |
| </div>
| |
| <div class="pdbe-citations 5ly7" style="background-color:#fffaf0;"></div>
| |
|
| |
|
| ==See Also== | | ==See Also== |
| Line 24: |
Line 15: |
| *[[Beta-Hexosaminidase 3D structures|Beta-Hexosaminidase 3D structures]] | | *[[Beta-Hexosaminidase 3D structures|Beta-Hexosaminidase 3D structures]] |
| *[[Beta-N-acetylhexosaminidase 3D structures|Beta-N-acetylhexosaminidase 3D structures]] | | *[[Beta-N-acetylhexosaminidase 3D structures|Beta-N-acetylhexosaminidase 3D structures]] |
| == References ==
| |
| <references/>
| |
| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |