|1bnd, resolution 2.30Å ()|
STRUCTURE OF THE BRAIN-DERIVED NEUROTROPHIC FACTOR(SLASH)NEUROTROPHIN 3 HETERODIMER
The development and sustenance of specific neuronal populations in the peripheral and central nervous systems are controlled through the binding of neurotrophic factors to high-affinity cell surface receptors. The neurotrophins (nerve growth factor, NGF; brain-derived neurotrophic factor, BDNF; neurotrophin 3, NT3; and neurotrophin 4, NT4) are dimeric molecules which share approximately 50% sequence identity. The crystal structure of the murine NGF homodimer [McDonald et al. (1991) Nature 354, 411-414] indicated that the dimer interface corresponds to regions of high sequence conservation throughout the neurotrophin family. This potential compatibility was duly exploited for the production in vitro of noncovalent heterodimers between the different neurotrophins [Radziejewski, C., & Robinson, R.C. (1993) Biochemistry 32, 13350-13356; Jungbluth et al. (1994) Eur. J. Biochem. 221, 677-685]. Here, we report the X-ray structure at 2.3 A resolution of one such heterodimer, between human BDNF, and human NT3. The NGF, BDNF, and NT3 protomers share the same topology and are structurally equivalent in regions which contribute to the dimer interface in line with the propensity of the neurotrophins to form heterodimers. Analysis of the structure of regions of the BDNF/NT3 heterodimer involved in receptor specificity led us to conclude that heterodimer binding to p75 involves distant binding sites separately located on each protomer of the heterodimer. In contrast, heterodimer interactions with the trk receptors probably utilize hybrid binding sites comprised of residues contributed by both protomers in the heterodimer. The existence of such hybrid binding sites for the trk receptor provides an explanation for the lower activity of the BDNF/NT3 heterodimer in comparison to the homodimers.(ABSTRACT TRUNCATED AT 250 WORDS)
Structure of the brain-derived neurotrophic factor/neurotrophin 3 heterodimer., Robinson RC, Radziejewski C, Stuart DI, Jones EY, Biochemistry. 1995 Apr 4;34(13):4139-46. PMID:7703225
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
[BDNF_HUMAN] Defects in BDNF are a cause of congenital central hypoventilation syndrome (CCHS) [MIM:209880]; also known as congenital failure of autonomic control or Ondine curse. CCHS is a rare disorder characterized by abnormal control of respiration in the absence of neuromuscular or lung disease, or an identifiable brain stem lesion. A deficiency in autonomic control of respiration results in inadequate or negligible ventilatory and arousal responses to hypercapnia and hypoxemia. CCHS is frequently complicated with neurocristopathies such as Hirschsprung disease that occurs in about 16% of CCHS cases.
[BDNF_HUMAN] During development, promotes the survival and differentiation of selected neuronal populations of the peripheral and central nervous systems. Participates in axonal growth, pathfinding and in the modulation of dendritic growth and morphology. Major regulator of synaptic transmission and plasticity at adult synapses in many regions of the CNS. The versatility of BDNF is emphasized by its contribution to a range of adaptive neuronal responses including long-term potentiation (LTP), long-term depression (LTD), certain forms of short-term synaptic plasticity, as well as homeostatic regulation of intrinsic neuronal excitability. [NTF3_HUMAN] Seems to promote the survival of visceral and proprioceptive sensory neurons.
About this Structure
- Robinson RC, Radziejewski C, Stuart DI, Jones EY. Structure of the brain-derived neurotrophic factor/neurotrophin 3 heterodimer. Biochemistry. 1995 Apr 4;34(13):4139-46. PMID:7703225
- ↑ Weese-Mayer DE, Bolk S, Silvestri JM, Chakravarti A. Idiopathic congenital central hypoventilation syndrome: evaluation of brain-derived neurotrophic factor genomic DNA sequence variation. Am J Med Genet. 2002 Feb 1;107(4):306-10. PMID:11840487
- ↑ Egan MF, Kojima M, Callicott JH, Goldberg TE, Kolachana BS, Bertolino A, Zaitsev E, Gold B, Goldman D, Dean M, Lu B, Weinberger DR. The BDNF val66met polymorphism affects activity-dependent secretion of BDNF and human memory and hippocampal function. Cell. 2003 Jan 24;112(2):257-69. PMID:12553913