Journal article
The single lamprey neurofilament subunit (NF-180) lacks multiphosphorylation repeats and is expressed selectively in projection neurons
Brain research. Molecular brain research, Vol.29(1), pp.43-52
1995
DOI: 10.1016/0169-328X(94)00227-6
PMID: 7770000
Abstract
The lamprey is considered the most primitive living vertebrate and its neurofilaments (NFs) are unique in being homopolymers of a single 180 kDa subunit (NF-180). Previous immunologic studies have suggested that the sidearm of NF-180 is highly phosphorylated selectively in the largest diameter axons. We report in this study the isolation and characterization of cDNA clones encoding the NF-180 lamprey protein. In situ hybridization with Dgoxgenin-labeled cRNA revealed NF-180 message exclusively in neurons with long axons, such as reticulospinal neurons and cranial motor neurons. The core of NF-180 was similar in structure to those of mammalian neurofilaments, but surprisingly, the carboxy sidearm lacked the multiphosphorylation repeats characteristic of higher vertebrate and invertebrate neurofilaments. Overall there was a paucity of potential phosphorylation sites in the NF-180 carboxy-terminus compared to NF-M and NF-H of mammals, fish and squid. This, along with the highly acidic nature of the NF-180 sidearm, makes it unlikely that phosphorylation of sidearm residues regulates interfilament spacing and axon diameter through global electrostatic repulsion of the carboxy-terminus away from the filament backbone. Furthermore, the expression of a single neurofilament subunit in the lamprey that is most similar to the NF-M of higher vertebrates suggests that all three mammalian neurofilament subunits evolved from a single NF-M-like precursor.
Details
- Title: Subtitle
- The single lamprey neurofilament subunit (NF-180) lacks multiphosphorylation repeats and is expressed selectively in projection neurons
- Creators
- Alan J JacobsJohn KamholzMichael E Selzer
- Resource Type
- Journal article
- Publication Details
- Brain research. Molecular brain research, Vol.29(1), pp.43-52
- DOI
- 10.1016/0169-328X(94)00227-6
- PMID
- 7770000
- NLM abbreviation
- Brain Res Mol Brain Res
- ISSN
- 0169-328X
- eISSN
- 1872-6941
- Publisher
- Elsevier B.V
- Language
- English
- Date published
- 1995
- Academic Unit
- Neurology; Psychiatry
- Record Identifier
- 9984020727402771
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