6MKJ

Crystal structure of penicillin binding protein 5 (PBP5) from Enterococcus faecium in the closed conformation

6MKJ の概要

• エントリーDOI: 10.2210/pdb6mkj/pdb
• 分子名称: penicillin binding protein 5 (PBP5) (2 entities in total)
• 機能のキーワード: transpeptidase, pbp, peptide binding protein, penicillin binding protein, protein binding
• 由来する生物種: Enterococcus faecium
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 69858.78

構造登録者

Moon, T.M.,Soares, A.,D'Andrea, E.D.,Jaconcic, J.,Peti, W.,Page, R. (登録日: 2018-09-25, 公開日: 2018-10-31, 最終更新日: 2024-04-03)

主引用文献

Moon, T.M.,D'Andrea, E.D.,Lee, C.W.,Soares, A.,Jakoncic, J.,Desbonnet, C.,Garcia-Solache, M.,Rice, L.B.,Page, R.,Peti, W.
The structures of penicillin-binding protein 4 (PBP4) and PBP5 fromEnterococciprovide structural insights into beta-lactam resistance.
J. Biol. Chem., 293:18574-18584, 2018

PubMed Abstract: The final steps of cell-wall biosynthesis in bacteria are carried out by penicillin-binding proteins (PBPs), whose transpeptidase domains form the cross-links in peptidoglycan chains that define the bacterial cell wall. These enzymes are the targets of β-lactam antibiotics, as their inhibition reduces the structural integrity of the cell wall. Bacterial resistance to antibiotics is a rapidly growing concern; however, the structural underpinnings of PBP-derived antibiotic resistance are poorly understood. PBP4 and PBP5 are low-affinity, class B transpeptidases that confer antibiotic resistance to and , respectively. Here, we report the crystal structures of PBP4 (1.8 Å) and PBP5 (2.7 Å) in their apo and acyl-enzyme complexes with the β-lactams benzylpenicillin, imipenem, and ceftaroline. We found that, although these three β-lactams adopt geometries similar to those observed in other class B PBP structures, there are small, but significant, differences that likely decrease antibiotic efficacy. Further, we also discovered that the N-terminal domain extensions in this class of PBPs undergo large rigid-body rotations without impacting the structure of the catalytic transpeptidase domain. Together, our findings are defining the subtle functional and structural differences in the PBPs that allow them to support transpeptidase activity while also conferring bacterial resistance to antibiotics that function as substrate mimics.

PubMed: 30355734
DOI: 10.1074/jbc.RA118.006052

実験手法

X-RAY DIFFRACTION (2.864 Å)