FAM231B, or family with sequence similarity 231B, is a protein found in humans and is encoded by FAM231B gene.[1]Orthologs of FAM231B are only found back to primates.[2]
FAM231B is found on human Chromosome 1 on locus 1p36.13 running in the positive direction, surrounded by RNU1-6P upstream and transfer RNA-Gly 4-1 downstream.[3][4] There are no aliases of FAM231B.[5]
Its mRNA sequence is 1312 base pairs long, with the coding sequence in region 343 through 852, and there is only one exon.[6]
The protein is 169 amino acids long.[7] The molecular weight of the unprocessed protein is 18.2 kDa and the processed protein is 18.3 kDa.[8] The isoelectric point of the protein is 7.76 and a mixed charged cluster was found from amino acid 66 to 125.[9] Other features of the protein include a positive charge run and a negative charge run, both spanning 4 amino acids.[10]
The predicted secondary structure of the protein consists of many coils, 3 β-sheets and 5 α-helixes.[11] Potential post-translational modifications of the protein include myristoylation and sumoylation.[12][13]The mature protein is predicted to be transported to the nucleus.[14]
Expression in Tissues
FAM231B is highly regulated in brain tissue and the spinal cord.[15] From GeoProfiles, other tissues where expression is regulated are visceral fat, adipose, thyroid, breast, coronary artery, pancreas, colon, vaginal epithelium, smooth muscle, and fallopian tube epithelium.[16]
Predicted regulation in the secondary structure are two stem loops in the 5' UTR and two more in the 3' UTR.[18]
Function
The function of the protein is not yet well understood in the scientific community. The protein contains domain of unknown function (DUF) 4741, which is part of the FAM231 family.[19]
Homology & Evolution
File:Evolutiongraph.pngA graph comparing the evolutionary rate of FAM231B and its homologs to the Fibrinogen and Cytochrome C proteins.
There are three human paralogs: FAM231A, FAM231C, and FAM231D and a comparison of the protein percent identity and similarity are found in the table below. There are three strict orthologs of FAM231B: in humans, the Pan troglodytes (Common chimpanzee), and the Papio anubis (Olive baboon). No other orthologs are found beyond primates.[20]
The evolutionary rate of FAM231B was compared to Fibrinogen and Cytochrome C. FAM231B is predicted to have evolved faster than both of the proteins compared.
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