Dynamics and conformational propensities of staphylococcal CntA

Area of Science:

• Biochemistry and Molecular Biology
• Microbiology
• Structural Biology

Background:

• Enzymes utilize transition metals as essential co-factors in biological catalysis.
• Staphylococcus aureus employs metal acquisition systems, like Cnt, to obtain metals during infection.
• The CntA protein's conformational changes upon staphylopine binding are not well understood.

Purpose of the Study:

• To investigate the structural dynamics of CntA during its close-to-open transition.
• To identify key residues and regions involved in CntA's conformational signaling.

Main Methods:

• Computational approaches were used to analyze structural changes in CntA.
• Rigid body rotation and translation of domain II were quantified.
• Analysis of clustered communities regulating conformational changes.

Main Results:

• CntA undergoes a 37° rigid body rotation and 1.1 Å translation in domain II.
• Specific residue communities (4 and 5) are crucial for conformational changes.
• Two intermediate states were identified between the open and close conformations.
• CntA preferentially fluctuates non-conserved regions, maintaining domain II stability.

Conclusions:

• The CntA protein exhibits complex conformational dynamics upon staphylopine recognition.
• Understanding these dynamics offers potential therapeutic targets for Staphylococcus aureus infections.
• CntA serves as a promising target for structural biologists aiming to disrupt its conformational mechanisms.