Spastin - Q9UBP0 (SPAST_HUMAN)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for Q9UBP0: 2
 
Function
ATP-dependent microtubule severing protein that specifically recognizes and cuts microtubules that are polyglutamylated (PubMed:11809724, PubMed:15716377, PubMed:16219033, PubMed:17389232, PubMed:20530212, PubMed:22637577, PubMed:26875866). Preferentially recognizes and acts on microtubules decorated with short polyglutamate tails: severing activity increases as the number of glutamates per tubulin rises from one to eight, but decreases beyond this glutamylation threshold (PubMed:26875866). Severing activity is not dependent on tubulin acetylation or detyrosination (PubMed:26875866). Microtubule severing promotes reorganization of cellular microtubule arrays and the release of microtubules from the centrosome following nucleation. It is critical for the biogenesis and maintenance of complex microtubule arrays in axons, spindles and cilia. SPAST is involved in abscission step of cytokinesis and nuclear envelope reassembly during anaphase in cooperation with the ESCRT-III complex (PubMed:19000169, PubMed:21310966, PubMed:26040712). Recruited at the midbody, probably by IST1, and participates in membrane fission during abscission together with the ESCRT-III complex (PubMed:21310966). Recruited to the nuclear membrane by IST1 and mediates microtubule severing, promoting nuclear envelope sealing and mitotic spindle disassembly during late anaphase (PubMed:26040712). Required for membrane traffic from the endoplasmic reticulum (ER) to the Golgi and endosome recycling (PubMed:23897888). Recruited by IST1 to endosomes and regulates early endosomal tubulation and recycling by mediating microtubule severing (PubMed:23897888). Probably plays a role in axon growth and the formation of axonal branches (PubMed:15716377). UniProt
Catalytic Activity
ATP + H2O = ADP + phosphate. UniProt
Pathway Maps
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Subunit Structure
Homohexamer (PubMed:17389232, PubMed:22637577). Mostly monomeric, but assembles into hexameric structure for short periods of time. Oligomerization seems to be a prerequisite for catalytic activity (PubMed:17389232, PubMed:22637577). Binding to ATP in a cleft between two adjacent subunits stabilizes the homohexameric form (PubMed:17389232, PubMed:22637577). Binds to microtubules at least in part via the alpha-tubulin and beta-tubulin tails (PubMed:15269182, PubMed:15716377, PubMed:23272056). The hexamer adopts a ring conformation through which microtubules pass prior to being severed (PubMed:17389232, PubMed:22637577). Does not interact strongly with tubulin heterodimers (PubMed:15269182, PubMed:15716377, PubMed:23272056). Interacts (via MIT domain) with CHMP1B; the interaction is direct (PubMed:15537668, PubMed:18997780). Interacts with SSNA1 (PubMed:15269182). Interacts with ATL1 (PubMed:16339213, PubMed:16815977). Interacts with RTN1 (PubMed:16602018). Interacts with ZFYVE27 (PubMed:16826525, PubMed:23969831). Isoform 1 but not isoform 3 interacts with RTN2 (PubMed:22232211). Interacts with REEP1 (PubMed:20200447). Interacts (via MIT domain) with IST1 (PubMed:23897888, PubMed:26040712). UniProt
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Data in green originates from UniProtKB  
Variation data (sourced from UniProt) shows non-genetic variation from the ExPASy   and dbSNP   websites.
Data in yellow originates from Pfam  , by interacting with the HMMER3 web site  
Data in purple originates from Phosphosite  .
Data in orange originates from the SCOP   (version 1.75) and SCOPe   (version 2.04) classifications.
Data in grey has been calculated using BioJava  . Protein disorder predictions are based on JRONN (Troshin, P. and Barton, G. J. unpublished), a Java implementation of RONN  
  • Red: potentially disorderd region
  • Blue: probably ordered region.
Hydropathy has been calculated using a sliding window of 15 residues and summing up scores from standard hydrophobicity tables.
  • Red: hydrophobic
  • Blue: hydrophilic.
Data in lilac represent the genomic exon structure projected onto the UniProt sequence.
Data in blue originates from PDB
  • Secstruc: Secondary structure projected from representative PDB entries onto the UniProt sequence.
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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