1sgf
From Proteopedia
CRYSTAL STRUCTURE OF 7S NGF: A COMPLEX OF NERVE GROWTH FACTOR WITH FOUR BINDING PROTEINS (SERINE PROTEINASES)
Structural highlights
Function[K1KB3_MOUSE] 7S NGF alpha chain stabilizes the 7S complex. The beta dimer promotes neurite growth. The gamma chain is an arginine-specific protease; it may also have plasminogen activator activity, as well as mitogenic activity for chick embryo fibroblasts. [NGF_MOUSE] Nerve growth factor is important for the development and maintenance of the sympathetic and sensory nervous systems. Extracellular ligand for the NTRK1 and NGFR receptors, activates cellular signaling cascades through those receptor tyrosine kinase to regulate neuronal proliferation, differentiation and survival. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedBACKGROUND: Nerve growth factor (NGF) is a neurotrophic factor that promotes the differentiation and survival of certain populations of neurons in the central and peripheral nervous systems. 7S NGF is an alpha 2 beta 2 gamma 2 complex in which the beta-NGF dimer (the active neurotrophin) is associated with two alpha-NGF and two gamma-NGF subunits, which belong to the glandular kallikrein family of serine proteinases. The gamma-NGF subunit is an active serine proteinase capable of processing the precursor form of beta-NGF, whereas alpha-NGF is an inactive serine proteinase. The structure of 7S NGF could be used as a starting point to design inhibitors that prevent NGF binding to its receptors, as a potential treatment of neurodegenerative diseases. RESULTS: The crystal structure of 7S NGF shows that the two gamma-NGF subunits make extensive interactions with each other around the twofold axis of the complex and have the C-terminal residues of the beta-NGF subunits bound within their active sites. The 'activation domain' of each of the alpha-NGF subunits is in an inactive (zymogen-like) conformation and makes extensive interactions with the beta-NGF dimer. The two zinc ions that stabilize the complex are located at the relatively small interfaces between the alpha-NGF and gamma-NGF subunits. CONCLUSIONS: The structure of 7S NGF shows how the twofold axis of the central beta-NGF dimer organizes the symmetry of this multisubunit growth factor complex. The extensive surface of beta-NGF buried within the 7S complex explains the lack of neurotrophic activity observed for 7S NGF. The regions of the beta-NGF dimer that contact the alpha-NGF subunits overlap with those known to engage NGF receptors. Two disulphide-linked loops on alpha-NGF make multiple interactions with beta-NGF and suggest that it might be possible to design peptides that inhibit the binding of beta-NGF to its receptors. Structure of mouse 7S NGF: a complex of nerve growth factor with four binding proteins.,Bax B, Blundell TL, Murray-Rust J, McDonald NQ Structure. 1997 Oct 15;5(10):1275-85. PMID:9351801[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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