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Structural studies of streptococcus agalactiae hyaluronate lyase
1Department of Microbiology, 933 19th Street South, 545 CHSB-19, University of Alabama at Birmingham, Birmingham, Alabama 35294--2041, USA. jedrzejas@uab.edu
Summary
Streptococcus agalactiae produces hyaluronate lyase, an enzyme aiding its invasion by degrading host tissues. Researchers crystallized the active 92 kDa form, enabling structural analysis to understand its catalytic mechanism.
Area of Science:
- Biochemistry
- Structural Biology
- Microbiology
Background:
- Streptococcus agalactiae is a bacterium that can cause invasive infections.
- Hyaluronate lyase, an enzyme produced by S. agalactiae, degrades extracellular matrix components, potentially facilitating bacterial invasion.
- The enzyme exists in a 111 kDa native form and a smaller, active 92 kDa form after autocatalytic conversion.
Purpose of the Study:
- To initiate the determination of the catalytic mechanism of Streptococcus agalactiae hyaluronate lyase.
- To obtain high-resolution crystals of the enzymatically active form of hyaluronate lyase for structural studies.
Main Methods:
- Crystallization of the 111 kDa and 92 kDa forms of hyaluronate lyase using vapor-diffusion with polyethylene glycol monomethyl ether 5000 and potassium thiocyanate.
- X-ray diffraction analysis of the crystallized enzymes.
- Collection of diffraction data from an ethylmercuricthiosalicylic acid heavy-atom derivative of the 92 kDa enzyme crystals.
Main Results:
- Crystals of the 92 kDa hyaluronate lyase diffracted X-rays to 2.1 Å resolution.
- The crystal symmetry was determined to be C222(1) with unit-cell parameters a = 51.69, b = 157.03, c = 239.20 Å.
- Data were collected for a heavy-atom derivative, enabling structure solution.
Conclusions:
- The 92 kDa truncated form of hyaluronate lyase is suitable for high-resolution structural determination.
- Structural insights into hyaluronate lyase will aid in understanding the catalytic mechanism of this key virulence factor.