The P-loop--a common motif in ATP- and GTP-binding proteins

Area of Science:

• Biochemistry
• Structural Biology
• Molecular Biology

Background:

• Many proteins involved in energy metabolism bind adenosine triphosphate (ATP) and guanosine triphosphate (GTP).
• A common structural motif, the phosphate-binding loop (P-loop), is crucial for this binding.
• The P-loop typically features a glycine-rich region followed by conserved lysine and serine/threonine residues.

Purpose of the Study:

• To review current knowledge regarding the P-loop.
• To illustrate the relationship between P-loop sequence, three-dimensional structure, and protein function.
• To highlight the significance of P-loops in ATP- and GTP-binding proteins.

Main Methods:

• Review of existing literature on P-loop containing proteins.
• Analysis of solved three-dimensional structures of ATP- and GTP-binding proteins.
• Comparative analysis of P-loop sequences and structures.

Main Results:

• The P-loop is a conserved structural element in a wide range of ATP- and GTP-binding proteins.
• The primary sequence of the P-loop, characterized by specific amino acid patterns, is critical for its function.
• Structural data reveals how the P-loop interacts with nucleotide phosphates.

Conclusions:

• The P-loop is a fundamental component enabling nucleotide binding and hydrolysis in numerous proteins.
• Understanding P-loop sequence and structure provides insights into protein function and evolution.
• Further research into P-loops can inform the design of novel proteins and therapeutic agents.