Myotubularin-related protein 13 (IPR030567)

Short name: MTMR13

Overlapping homologous superfamilies


Family relationships


Myotubularin-related protein 13 (MTMR13), also known as SET-binding factor 2 (SBF2), belongs to the myotubularin family. It may function as a guanine nucleotide exchange factor (GEF) that activates Rab28 (a Rab GTPase) [PMID: 20937701]. Loss of MTMR13 leads to the Charcot-Marie-Tooth 4B (CMT4B) peripheral neuropathy, which is a recessive demyelinating form of Charcot-Marie-Tooth disease, a disorder of the peripheral nervous system [PMID: 15998640, PMID: 18349142].

The family of myotubularin (MTM) phosphoinositide phosphatases includes catalytically inactive members, or pseudophosphatases, which contain inactivating substitutions in the phosphatase domain. MTMR13 is one of them. MTMR13 exists in cells independently as a homodimer, as well as in complex with a homodimer of MTMR2. Association with MTMR2 dramatically increases MTMR2 enzymatic activity [PMID: 16399794].

GO terms

Biological Process

GO:0043087 regulation of GTPase activity

Molecular Function

GO:0019208 phosphatase regulator activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.