A quick solution: ab initio structure determination of a 19 kDa metalloproteinase using ACORN

Area of Science:

• Structural Biology
• Biochemistry
• X-ray Crystallography

Background:

• Metalloproteinases are crucial enzymes involved in various biological processes.
• Determining enzyme structures at atomic resolution aids in understanding their mechanisms and developing inhibitors.
• Deuterolysin is a metalloproteinase whose high-resolution structure was previously challenging to obtain.

Purpose of the Study:

• To determine the atomic structure of metalloproteinase deuterolysin at unprecedented resolution.
• To evaluate the efficacy of new direct-methods software (ACORN) in solving complex protein structures.
• To demonstrate a rapid and automated workflow for protein structure determination.

Main Methods:

• High-resolution (1.0 A) X-ray diffraction data collection using synchrotron radiation.
• Structure solution using the direct-methods program ACORN with Zn atom coordinates.
• Automated model building with ARP/wARP and refinement using REFMAC.
• Utilizing computational tools for efficient structure determination.

Main Results:

• The atomic structure of deuterolysin was successfully solved at 1.0 A resolution.
• The ACORN program enabled efficient phase determination from the high-resolution data.
• Automated building and refinement procedures required minimal manual intervention.
• The entire structure determination process was completed in under 6 hours of computational time.

Conclusions:

• High-resolution data combined with advanced computational tools significantly accelerates protein structure determination.
• The ACORN program is a powerful tool for solving protein structures, particularly when starting from known atomic positions.
• This study establishes an efficient pipeline for rapid structural analysis of metalloproteinases and potentially other enzymes.