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X-ray structure of Streptococcus pneumoniae PBP2x, a primary penicillin target enzyme
1Institut de Biologie Structurale, Laboratoire de Cristallographie Macromoléculaire, Grenoble, France.
Abstract:
All beta-lactam antibiotics exert their biological effects by interacting with a unique class of proteins, the penicillin-binding proteins (PBPs). These membrane proteins are involved in the biosynthesis of the murein or peptidoglycan, a mesh-like structure which completely surrounds the bacterial cell. Sequence similarities indicate that one domain of these proteins belongs to a large family of beta-lactam-recognizing proteins, which includes the active-site serine beta-lactamases. We here report the first three-dimensional crystal structure of a high molecular weight penicillin-binding protein, PBP2x of Streptococcus pneumoniae, at 3.5 A resolution. The molecule has three domains, the central domain being a transpeptidase, which is a suitable target for antibiotic development.
Insights
Researchers determined the 3D crystal structure of Streptococcus pneumoniae
Area of Science:
- Microbiology
- Structural Biology
- Drug Discovery
Background:
- Penicillin-binding proteins (PBPs) are essential bacterial membrane proteins involved in peptidoglycan biosynthesis.
- PBPs are the primary targets for beta-lactam antibiotics.
- Structural insights into PBPs are crucial for developing new antibacterial agents.
Purpose of the Study:
- To determine the three-dimensional crystal structure of a high molecular weight penicillin-binding protein, PBP2x, from Streptococcus pneumoniae.
- To provide structural basis for understanding PBP-antibiotic interactions.
- To identify potential targets for novel antibiotic development.
Main Methods:
- X-ray crystallography was employed to determine the structure of PBP2x.
- High molecular weight penicillin-binding protein PBP2x from Streptococcus pneumoniae was purified.
- The crystal structure was resolved at 3.5 A resolution.
Main Results:
- The first three-dimensional crystal structure of a high molecular weight penicillin-binding protein, PBP2x of Streptococcus pneumoniae, was determined.
- The PBP2x molecule comprises three distinct domains.
- The central domain of PBP2x exhibits transpeptidase activity.
Conclusions:
- The determined structure of PBP2x provides valuable insights into the mechanism of action of beta-lactam antibiotics.
- The transpeptidase domain represents a promising target for the development of new antibiotics against Streptococcus pneumoniae.
- Structural information can guide the design of more effective antibacterial drugs.