[No authors listed]
The sorting nexin (SNX) protein family is implicated in the regulation of receptor degradation and membrane traffic in the cell. With the aim of identifying novel genes involved in receptor degradation and recycling, we have cloned a new member of the sorting nexin gene family, human sorting nexin L, SNX-L (or SNX21). This gene includes 4 exons and 3 introns, and is located on chromosome 20q12-13.1 region, encompassing 8 kb. The full-length cDNA of SNX-L is 1,811 bp, with an open reading frame of 1,092 bp. The protein consists of 364 amino acids and encodes a 40 kDa protein. The SNX-L protein has a common PX domain shared by all SNX family members. The similarity of SNX-L PX domain to the PX consensus sequence is over 40%. PX domains have been shown to associate with specific phospholipids and membrane compartments. Expression analysis of SNX-L mRNA indicates that SNX-L is distinctly and highly expressed in fetus liver, but only weakly expressed in brain, muscle (skeleton muscle, smooth muscle, and cardiac muscle), kidney, and adrenal gland. Strong liver expression of SNX-L is maintained from 12 to 25 weeks during human fetus development, suggesting that SNX-L may be a regulatory gene involved in receptor protein degradation during embryonic liver development.
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