Subunit structure of high molecular weight mouse nerve growth factor

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Mouse submandibular glands and saliva contain nerve growth factor (NGF).
• NGF exists as a high molecular weight oligomeric macromolecule.
• This macromolecule is composed of alpha, beta, and gamma subunits and is a metalloprotein containing Zn(II).

Purpose of the Study:

• To elucidate the precise subunit composition of the high molecular weight NGF from mouse submandibular glands.
• To characterize the stoichiometry of subunits and the presence of Zn(II) in the NGF complex.

Main Methods:

• Utilized multiple physicochemical measurement techniques.
• Analyzed the subunit structure of high molecular weight NGF.

Main Results:

• The high molecular weight NGF molecule contains two alpha subunits.
• The complex includes one beta subunit (the nerve growth-promoting protein).
• One gamma subunit (a serine protease) and one tightly bound Zn(II) ion are present per molecule.

Conclusions:

• The high molecular weight NGF is a heterotetramer (2 alpha, 1 beta, 1 gamma subunits).
• The Zn(II) ion is an integral component of this metalloprotein complex.
• This structural determination provides insight into NGF's biological role and regulation.