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SPAG8
HPA
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  • SPAG8
PROTEIN SUMMARY GENE INFORMATION RNA DATA ANTIBODY DATA
GENERAL INFORMATIONi

General description of the gene and the encoded protein(s) using information from HGNC and Ensembl, as well as predictions made by the Human Protein Atlas project.

Gene namei

Official gene symbol, which is typically a short form of the gene name, according to HGNC.

SPAG8
Synonyms BS-84, CT142, HSD-1, hSMP-1, SPAG3
Gene descriptioni

Full gene name according to HGNC.

Sperm associated antigen 8
Predicted locationi

All transcripts of all genes have been analyzed regarding the location(s) of corresponding protein based on prediction methods for signal peptides and transmembrane regions.

  • Genes with at least one transcript predicted to encode a secreted protein, according to prediction methods or to UniProt location data, have been further annotated and classified with the aim to determine if the corresponding protein(s) are secreted or actually retained in intracellular locations or membrane-attached.

  • Remaining genes, with no transcript predicted to encode a secreted protein, will be assigned the prediction-based location(s).

The annotated location overrules the predicted location, so that a gene encoding a predicted secreted protein that has been annotated as intracellular will have intracellular as the final location.

Intracellular
Protein evidence Evidence at protein level (all genes)
GENE INFORMATIONi

Gene information from Ensembl and Entrez, as well as links to available gene identifiers are displayed here. Information was retrieved from Ensembl if not indicated otherwise.

Chromosome 9
Cytoband p13.3
Chromosome location (bp) 35808045 - 35812272
Number of transcriptsi

Number of protein-coding transcripts from the gene as defined by Ensembl.

4
Ensembl ENSG00000137098 (version 109)
Entrez gene 26206
HGNC HGNC:14105
UniProt Q99932 (UniProt - Evidence at protein level)
neXtProt NX_Q99932
GeneCards SPAG8
Antibodypedia SPAG8 antibodies


PROTEIN FUNCTION
Protein function (UniProt)i

Useful information about the protein provided by UniProt.

Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme, which is required for motile cilia beating 1. Plays a role in spermatogenesis by enhancing the binding of CREM isoform tau to its coactivator FHL5 and increasing the FHL5-regulated transcriptional activation of CREM isoform tau (By similarity). Involved in the acrosome reaction and in binding of sperm to the zona pellucida (By similarity). Plays a role in regulation of the cell cycle by controlling progression through the G2/M phase, possibly by delaying the activation of CDK1 which is required for entry into mitosis 2. May play a role in fertility and microtubule formation through interaction with RANBP9 3.... show less
Biological process (UniProt)i

Keywords assigned by UniProt to proteins because they are involved in a particular biological process.

Cell cycle, Differentiation, Fertilization, Spermatogenesis
Gene summary (Entrez)i

Useful information about the gene from Entrez

The correlation of anti-sperm antibodies with cases of unexplained infertility implicates a role for these antibodies in blocking fertilization. Improved diagnosis and treatment of immunologic infertility, as well as identification of proteins for targeted contraception, are dependent on the identification and characterization of relevant sperm antigens. The protein encoded by this gene is recognized by sperm agglutinating antibodies from an infertile woman. This protein is localized in germ cells of the testis at all stages of spermatogenesis and is localized to the acrosomal region of mature spermatozoa. This protein interacts with ACT (activator of CREM in testis) and may play a role in CREM (cAMP response element modulator)-ACT-mediated gene transcription during spermatogenesis. This protein may also play a role in spermatogenesis by regulating microtubule formation and cell division. Alternatively spliced variants that encode different protein isoforms have been described but the full-length sequences of only two have been determined. [provided by RefSeq, Jul 2012]... show less
PROTEIN INFORMATIONi

The protein information section displays alternative protein-coding transcripts (splice variants) encoded by this gene according to the Ensembl database.

The Splice variant identifier links to the Ensembl website protein summary for the selected splice variant. The data in the Swissprot and TrEMBL columns links to corresponding pages in the UniProt database.

The protein classes assigned to this protein are shown if expanding the data in the protein class column. Parent protein classes are in bold font and subclasses are listed under the parent class.

The length of the protein (amino acid residues according to Ensembl), molecular mass (kDalton), predicted signal peptide and number of predicted transmembrane region(s) according to in-house majority decision methods based on sets of predictors are also reported.
Splice variant SwissProt TrEMBL Protein class Gene ontology Length & mass Signal peptide
(predicted)
Transmembrane regions
(predicted)
SPAG8-201
ENSP00000340982
ENST00000340291
Q99932
[Direct mapping] Sperm-associated antigen 8
Show all
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Mapped to neXtProt
   neXtProt - Evidence at protein level
Show all
GO:0001669 [acrosomal vesicle]
GO:0003674 [molecular_function]
GO:0005515 [protein binding]
GO:0005634 [nucleus]
GO:0005737 [cytoplasm]
GO:0005819 [spindle]
GO:0005856 [cytoskeleton]
GO:0005879 [axonemal microtubule]
GO:0007049 [cell cycle]
GO:0007283 [spermatogenesis]
GO:0007338 [single fertilization]
GO:0008017 [microtubule binding]
GO:0008150 [biological_process]
GO:0016020 [membrane]
GO:0030154 [cell differentiation]
GO:0031410 [cytoplasmic vesicle]
GO:0042995 [cell projection]
GO:0045944 [positive regulation of transcription by RNA polymerase II]
Show all
501 aa
53.5 kDa
No 0
SPAG8-202
ENSP00000379878
ENST00000396638
Q99932
[Direct mapping] Sperm-associated antigen 8
Show all
A0A140VJV0
[Target identity:100%; Query identity:100%] Testicular tissue protein Li 177
Show all
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Mapped to neXtProt
   neXtProt - Evidence at protein level
Show all
GO:0001669 [acrosomal vesicle]
GO:0001673 [male germ cell nucleus]
GO:0003674 [molecular_function]
GO:0005515 [protein binding]
GO:0005634 [nucleus]
GO:0005737 [cytoplasm]
GO:0005819 [spindle]
GO:0005856 [cytoskeleton]
GO:0005879 [axonemal microtubule]
GO:0007049 [cell cycle]
GO:0007283 [spermatogenesis]
GO:0007338 [single fertilization]
GO:0008017 [microtubule binding]
GO:0008150 [biological_process]
GO:0016020 [membrane]
GO:0030154 [cell differentiation]
GO:0031410 [cytoplasmic vesicle]
GO:0032092 [positive regulation of protein binding]
GO:0042995 [cell projection]
GO:0045944 [positive regulation of transcription by RNA polymerase II]
Show all
485 aa
51.1 kDa
No 0
SPAG8-209
ENSP00000418072
ENST00000484764
C9JAA8
[Direct mapping] Sperm-associated antigen 8
Show all
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Show all
GO:0008017 [microtubule binding]
Show all
477 aa
50.1 kDa
No 0
SPAG8-212
ENSP00000417462
ENST00000497810
H7C4J6
[Direct mapping] Sperm-associated antigen 8
Show all
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Show all
GO:0008017 [microtubule binding]
Show all
483 aa
50.8 kDa
No 0

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