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In Vitro Biochemical Assays using Biotin Labels to Study Protein-Nucleic Acid Interactions

In Vitro Biochemical Assays using Biotin Labels to Study Protein-Nucleic Acid Interactions

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Molecular modeling study for interaction between Bacillus subtilis Obg and Nucleotides.

Yuno Lee¹, Woo Young Bang, Songmi Kim

¹Division of Applied Life Science, Environmental Biotechnology National Core Research Center, Plant Molecular Biology and Biotechnology Research Center, Gyeongsang National University, Jinju, Gyeongsangnam-do, Republic of Korea.

|September 11, 2010

Summary

Bacterial Obg proteins are activated by GTP, leading to structural changes in the Obg fold and switch 2 element. This GTP binding mechanism is crucial for ribosome assembly and presents a potential target for antibacterial drugs.

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Area of Science:

Biochemistry
Molecular Biology
Structural Biology

Background:

Bacterial Obg proteins are P-loop GTPases with conserved GTP-binding and Obg fold domains.
Obg proteins are essential for bacterial survival and ribosome assembly.
Obg proteins are emerging targets for novel antibacterial drug development.

Purpose of the Study:

To investigate the structural changes in Bacillus subtilis Obg (BsObg) upon GTP binding.
To elucidate the role of GTPase switch elements in Obg protein activation.
To understand the molecular basis for Obg protein interaction with L13 for ribosome assembly.

Main Methods:

Four molecular dynamics (MD) simulations were performed on BsObg with GTP, GDP, and GDP + Pi.
Comparative analysis of protein structures using C(alpha)-C(alpha) distance plots and domain angles.
Root-mean-square fluctuation (RMSF) analysis to assess region flexibility.

Main Results:

GTP binding induced significant conformational changes in the Obg fold and switch 2 element compared to GDP or apo forms.
The switch 2 element exhibited increased flexibility in the GTP-bound state.
A key interaction between GTP's gamma-phosphate oxygen and residue D212 in switch 2 was identified, absent in other nucleotide-bound states.

Conclusions:

GTP binding activates Obg proteins through specific structural rearrangements, particularly in the switch 2 element.
The identified binding mode and conformational changes provide insights into Obg activation and L13 interaction.
Understanding Obg protein dynamics offers a promising avenue for developing new antibacterial therapies.