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Protein Page:
USP9Y (human)

USP9Y May function as a ubiquitin-protein or polyubiquitin hydrolase involved both in the processing of ubiquitin precursors and of ubiquitinated proteins. May therefore play an important role regulatory role at the level of protein turnover by preventing degradation of proteins through the removal of conjugated ubiquitin. Essential component of TGF-beta/BMP signaling cascade. Deubiquitinates monoubiquitinated SMAD4, opposing the activity of E3 ubiquitin-protein ligase TRIM33. Monoubiquitination of SMAD4 hampers its ability to form a stable complex with activated SMAD2/3 resulting in inhibition of TGF- beta/BMP signaling cascade. Deubiqitination of SMAD4 by USP9X re- empowers its competence to mediate TGF-beta signaling. USP9Y is located in the 'azoospermia factor a' (AZFa) region on chromosome Y which is deleted in Sertoli cell- only syndrome. This is an infertility disorder in which no germ cells are visible in seminiferous tubules leading to azoospermia. However, AZFa deletions resulting in complete loss of USP9Y have also been found in normospermic men (PubMed:19246359). Defects in USP9Y may be a cause of spermatogenic failure Y-linked type 2 (SPGFY2). It is a disorder resulting in the absence (azoospermia) or reduction (oligozoospermia) of sperm in the semen, leading to male infertility. The role of USP9Y in spermatogenesis failure is uncertain. A 4-bp deletion in a splice-donor site, causing exon skipping and protein truncation has been observed in non-obstructive azoospermia (PubMed:10581029). However, complete USP9Y deletion has been detected in individuals with no spermatogenic defects (PubMed:19246359). Belongs to the peptidase C19 family. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: EC; Protease; Ubiquitin conjugating system; Ubiquitin-specific protease
Chromosomal Location of Human Ortholog: Yq11.2
Cellular Component: cytoplasm
Molecular Function: cysteine-type peptidase activity; ubiquitin-specific protease activity
Biological Process: BMP signaling pathway; cell migration; protein deubiquitination; spermatogenesis; transforming growth factor beta receptor signaling pathway
Disease: Spermatogenic Failure, Y-linked, 2
Reference #:  O00507 (UniProtKB)
Alt. Names/Synonyms: Deubiquitinating enzyme FAF-Y; DFFRY; fat facets protein related, Y-linked; Fat facets protein-related, Y-linked; fat facets-like homolog; FLJ33043; Probable ubiquitin carboxyl-terminal hydrolase FAF-Y; ubiquitin specific peptidase 9, Y-linked; ubiquitin specific peptidase 9, Y-linked (fat facets-like, Drosophila); Ubiquitin thioesterase FAF-Y; ubiquitin thiolesterase FAF-Y; ubiquitin-specific processing protease FAF-Y; Ubiquitin-specific protease 9, Y chromosome; Ubiquitin-specific-processing protease FAF-Y; USP10; USP9Y
Gene Symbols: USP9Y
Molecular weight: 291,077 Da
Basal Isoelectric point: 5.56  Predict pI for various phosphorylation states
Select Structure to View Below


Protein Structure Not Found.

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