Selenocysteine is the 21st proteinogenic amino acid. Selenoproteins contain selenocysteine residues. Selenocysteine is an analogue of the more common cysteine with selenium in place of the sulfur.
In molecular biology a selenoprotein is any protein that includes a selenocysteine amino acid residue. Among functionally characterized selenoproteins are five glutathione peroxidases (GPX) and three thioredoxin reductases, (TrxR/TXNRD) which both contain only one Sec. Selenoprotein P is the most common selenoprotein found in the plasma. It is unusual because in humans it contains 10 Sec residues, which are split into two domains, a longer N-terminal domain that contains 1 Sec, and a shorter C-terminal domain that contains 9 Sec. The longer N-terminal domain is likely an enzymatic domain, and the shorter C-terminal domain is likely a means of safely transporting the very reactive selenium atom throughout the body.
Fibroblast growth factor 2, also known as basic fibroblast growth factor (bFGF) and FGF-β, is a growth factor and signaling protein encoded by the FGF2 gene. It binds to and exerts effects via specific fibroblast growth factor receptor (FGFR) proteins, themselves a family of closely related molecules. Fibroblast growth factor protein was first purified in 1975; soon thereafter three variants were isolated: 'basic FGF' (FGF2); Heparin-binding growth factor-2; and Endothelial cell growth factor-2. Gene sequencing revealed that this group is the same FGF2 protein and is a member of a family of FGF proteins.
Glutathione peroxidase 1, also known as GPx1, is an enzyme that in humans is encoded by the GPX1 gene on chromosome 3. This gene encodes a member of the glutathione peroxidase family. Glutathione peroxidase functions in the detoxification of hydrogen peroxide, and is one of the most important antioxidant enzymes in humans.
FBLN1 is the gene encoding fibulin-1, an extracellular matrix and plasma protein.
Extracellular superoxide dismutase [Cu-Zn] is an enzyme that in humans is encoded by the SOD3 gene.
Glutathione peroxidase 4, also known as GPX4, is an enzyme that in humans is encoded by the GPX4 gene. GPX4 is a phospholipid hydroperoxidase that protects cells against membrane lipid peroxidation.
Glutathione peroxidase 2 is an enzyme that in humans is encoded by the GPX2 gene.
60S ribosomal protein L29 is a protein that in humans is encoded by the RPL29 gene.
Selenoprotein S, also known as SELS, is a human gene.
Selenoprotein N is a protein that in humans is encoded by the SEPN1 gene.
Collagen alpha-1(XIII) chain is a protein that in humans is encoded by the COL13A1 gene.
15 kDa selenoprotein is a protein that in humans is encoded by the SEP15 gene. Two alternatively spliced transcript variants encoding distinct isoforms have been found for this gene.
Sperm mitochondrial-associated cysteine-rich protein is a protein that in humans is encoded by the SMCP gene.
Extracellular sulfatase Sulf-2 is an enzyme that in humans is encoded by the SULF2 gene.
Selenoprotein W is a protein that in humans is encoded by the SEPW1 gene.
Angio-associated, migratory cell protein, also known as AAMP, is a protein which in humans is encoded by the AAMP gene. This protein has been conserved in evolution and is so common to many mammals. and it also has a yeast homolog which is the protein YCR072c.
Glutathione peroxidase 5 (GPx-5), also known as epididymal secretory glutathione peroxidase is an enzyme that in humans is encoded by the GPX5 gene.
Glutathione peroxidase 6 (GPx-6) is an enzyme that in humans is encoded by the GPX6 gene.
In molecular biology, the protein domain selenoprotein P (SelP) is the only known eukaryotic selenoprotein that contains multiple selenocysteine (Sec) residues. It is a secreted glycoprotein, often found in the plasma. Its precise function remains to be elucidated; however, it is thought to have antioxidant properties. This particular protein contains two domains: the C terminal and N terminal domain. The N-terminal domain is larger than the C terminal and the N-terminal is thought to be glycosylated.
