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- ****************************************
- * Nerve growth factor family signature *
- ****************************************
-
- Nerve growth factor (NGF or beta-NGF) is a vertebrate protein that stimulates
- division and differentiation of sympathetic and embryonic sensory neurons [1,
- 2]. NGF is a protein of about 120 residues that is cleaved from a larger
- precursor molecule. It contains six cysteines all involved in intrachain
- disulfide bonds. A schematic representation of the structure of NGF is shown
- below:
-
- +------------------------+
- | |
- | ******* |
- xxxxxxCxxxxxxxxxxxxxxxxxxxxxCxxxxCxxxxxCxxxxxxxxxxxxxCxCxxxx
- | | | |
- +--------------------------|-----+ |
- +---------------------+
-
- 'C': conserved cysteine involved in a disulfide bond.
- '*': position of the pattern.
-
- Some proteins have been found [3] to be structurally and functionally related
- to NGF, these are:
-
- - Brain-derived neurotrophic factor (BDNF), a protein that promotes the
- survival of neuronal populations all located either in the central nervous
- system or directly connected to it.
- - Neurotrophin-3 (NT-3), a protein that seems to promote the survival of
- visceral and proprioceptive sensory neurons.
- - Neurotrophins-4/5 (NT-4/5), which elicit neurite outgrowth from explanted
- dorsal root ganglia and could play a role in oogenesis and/or early
- embryogenesis.
-
- The pattern we have developed for the NGF family spans the central region of
- these proteins and include two of the six cysteines involved in disulfide
- bonds.
-
- -Consensus pattern: G-C-[KR]-G-[LIV]-[DE]-x(3)-[YW]-x-S-x-C
- [The two C's are involved in disulfide bonds]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / Pattern and text revised.
-
- [ 1] Levi-Montalcini R.
- Science 237:1154-1162(1987).
- [ 2] Bradshaw R.A., Blundell T.L., Lapatto R., McDonald N.Q., Murray-Rust J.
- Trends Biochem. Sci. 18:48-52(1993).
- [ 3] Lo D.C.
- Curr. Biol. 2:67-69(1992).
-