Introduction of CATSPERE
CATSPERE is a newly discovered member of cation channel sperm-associated protein family. It is predicted to be a single spanning-membrane protein type II. The topology of this protein is similar to CatSper-gamma and delta which are localized specifically to the plasma membrane in the same distinct quadrilateral arrangement shown for other subunits. This suggests that CATSPERE is a part of the mature CatSper signaling complex.
|Basic Information of CATSPERE|
|Protein Name||Cation channel sperm-associated protein subunit epsilon|
|Organism||Homo sapiens (Human)|
Function of CATSPERE Membrane Protein
Although there is currently few reports on the function of CATSPERE, it is speculated that it may be a co-protein of the CatSper complex. CATSPERE has been shown a high-sequence homology (52% identical/similar amino acids) with human CatSper-delta in extracellular sequences, which indicates a stabilizing function on channel assembly like that revealed for mouse CatSper-delta that is essential for channel expression and male fertility. Furthermore, a patient with the deficiency in cation channel of sperm (CatSper) function has a homozygous in-frame 6-bp deletion in exon 18 (c.2393_2398delCTATGG, rs761237686) of CATSPERE. This also suggests that CATSPERE is an important element for the normal function of CatSper complex and is required for late in the preparation of sperm for fertilization.
Fig.1 (A) Tissue expression profile of CatSper e and z. (B) Spatial localization of CatSpere and z mRNA in the testis. (C) Temporal expression of CatSper1, CatSpere, and CatSperz mRNAs during postnatal testis development. (D) Partitioning of CatSperε and CatSperζ in fractionated extracts of testis from wt mice. (Chung, 2017)
Application of CATSPERE Membrane Protein in Literature
This study reports an in-frame 6-bp deletion in exon 18 (c.2393_2398delCTATGG, rs761237686) of CATSPERE that is proposed to be the cause of loss of CatSper conductance and subfertility in patient 1.
Authors have identified two genes in mice that encode new accessory proteins in the CatSper channel complex named CatSper epsilon and CatSper zeta.
CATSPERE Preparation Options
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