Cloning and characterization of two neural-salient serine/arginine-rich (NSSR) proteins involved in the regulation of alternative splicing in neurones

Genes Cells. 1999 Oct;4(10):593-606. doi: 10.1046/j.1365-2443.1999.00286.x.


Background: In neurones, alternative splicing regulates the functions of many gene products. However, the molecular basis of neural-specific splicing, and how splicing regulation is modulated in different neurones remains to be determined.

Results: We cloned two new SR proteins, Neural-salient SR proteins (NSSR) 1 and 2, which are present at higher levels in brain and testis. During the differentiation, NSSR 1 is detected only in the neuronal stage. Both the purified recombinant NSSR 1 and 2 proteins enhance the in vitro splicing activity of nuclear extract. Moreover, recombinant NSSR 1 protein enhances the assembly of ribonucleoprotein complexes with S100 fraction. Over-expression of NSSR 2 prevents the inclusion of either the Flip or Flop exons in the splicing of the GluR-B gene, resulting in an increase in the abnormal exon-skipping product. In contrast, transient transfection with NSSR 1 promotes the inclusion of the Flip exon so that the abnormal product is spliced to the mature spliced form. This suppression of exon skipping by NSSR 1 is observed even with co-transfection of NSSR 2.

Conclusions: NSSR 1 and 2 were cloned from mouse cDNA libraries. Results indicate that NSSR 1 may play a crucial role in the regulation of alternative splicing in neurones.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alternative Splicing*
  • Amino Acid Sequence
  • Animals
  • Cell Cycle Proteins
  • Cell Line
  • Cloning, Molecular
  • Conserved Sequence
  • Gene Expression Regulation*
  • Mice
  • Molecular Sequence Data
  • Neoplasm Proteins*
  • Nerve Tissue Proteins / genetics
  • Nerve Tissue Proteins / metabolism*
  • Neurons / metabolism*
  • Organ Specificity
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • RNA-Binding Proteins*
  • Receptors, AMPA / metabolism
  • Repressor Proteins*
  • Sequence Alignment
  • Transfection


  • Cell Cycle Proteins
  • Fusip1 protein, mouse
  • Neoplasm Proteins
  • Nerve Tissue Proteins
  • RNA, Messenger
  • RNA-Binding Proteins
  • Receptors, AMPA
  • Repressor Proteins
  • glutamate receptor type B

Associated data

  • GENBANK/AB015894
  • GENBANK/AB015895