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FAM20B
HPA
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  • FAM20B
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.

FAM20B
Synonyms GXK1, KIAA0475
Gene descriptioni

Full gene name according to HGNC.

FAM20B glycosaminoglycan xylosylkinase
Protein classi

Assigned HPA protein class(es) for the encoded protein(s).

Metabolic proteins
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 1
Cytoband q25.2
Chromosome location (bp) 179025804 - 179076567
Number of transcriptsi

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

2
Ensembl ENSG00000116199 (version 109)
Entrez gene 9917
HGNC HGNC:23017
UniProt O75063 (UniProt - Evidence at protein level)
neXtProt NX_O75063
GeneCards FAM20B
Antibodypedia FAM20B antibodies


PROTEIN FUNCTION
Protein function (UniProt)i

Useful information about the protein provided by UniProt.

Responsible for the 2-O-phosphorylation of xylose in the glycosaminoglycan-protein linkage region of proteoglycans thereby regulating the amount of mature GAG chains. Sulfated glycosaminoglycans (GAGs), including heparan sulfate and chondroitin sulfate, are synthesized on the so-called common GAG-protein linkage region (GlcUAbeta1-3Galbeta1-3Galbeta1-4Xylbeta1-O-Ser) of core proteins, which is formed by the stepwise addition of monosaccharide residues by the respective specific glycosyltransferases. Xylose 2-O-phosphorylation may influence the catalytic activity of B3GAT3 (GlcAT-I) which completes the precursor tetrasaccharide of GAG-protein linkage regions on which the repeating disaccharide region is synthesized.... show less
Molecular function (UniProt)i

Keywords assigned by UniProt to proteins due to their particular molecular function.

Kinase, Transferase
Ligand (UniProt)i

Keywords assigned by UniProt to proteins because they bind, are associated with, or whose activity is dependent of some molecule.

ATP-binding, Manganese, Metal-binding, Nucleotide-binding
Gene summary (Entrez)i

Useful information about the gene from Entrez

Enables phosphotransferase activity, alcohol group as acceptor. Predicted to be involved in proteoglycan biosynthetic process. Located in Golgi apparatus and nucleoplasm. [provided by Alliance of Genome Resources, Apr 2022]... 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)
FAM20B-201
ENSP00000263733
ENST00000263733
O75063
[Direct mapping] Glycosaminoglycan xylosylkinase
Show all
A0A024R918
[Target identity:100%; Query identity:100%] Family with sequence similarity 20, member B, isoform CRA_a
Show all
Metabolic proteins
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   THUMBUP predicted membrane proteins
   TMHMM predicted membrane proteins
   Phobius predicted secreted proteins
   DeepTMHMM predicted secreted proteins
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Kim et al 2014)
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0000139 [Golgi membrane]
GO:0000166 [nucleotide binding]
GO:0005515 [protein binding]
GO:0005524 [ATP binding]
GO:0005654 [nucleoplasm]
GO:0005737 [cytoplasm]
GO:0005794 [Golgi apparatus]
GO:0016020 [membrane]
GO:0016301 [kinase activity]
GO:0016310 [phosphorylation]
GO:0016740 [transferase activity]
GO:0016773 [phosphotransferase activity, alcohol group as acceptor]
GO:0030166 [proteoglycan biosynthetic process]
GO:0046872 [metal ion binding]
Show all
409 aa
46.4 kDa
No 0
FAM20B-202
ENSP00000404005
ENST00000440702
X6RH03
[Direct mapping] Glycosaminoglycan xylosylkinase
Show all
Metabolic proteins
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   THUMBUP predicted membrane proteins
   TMHMM predicted membrane proteins
   Phobius predicted secreted proteins
   DeepTMHMM predicted secreted proteins
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Protein evidence (Ezkurdia et al 2014)
Show all
138 aa
15.8 kDa
No 0

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