Журнал протеомики и биоинформатики
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ISSN: 0974-276X
ISSN: 0974-276X
Roger S Holmes
Extracellular sulfatases (SULF1; SULF2) (EC: 3.1.6.-) are members of the sulfatase enzyme family which exhibit endoglucosamine-6-sulfatase activity and carry out essential roles in proteoglycan metabolism. These enzymes regulate a number of critical signalling pathways and the sulfation state of glycoaminoglycans in the extracellular space. SULF1 and SULF2 amino acid sequences and structures and SULF-like gene locations were examined using bioinformatic data from several genome projects. Sequence alignments and conserved secondary structures and key amino acid residues and domains were studied. Comparative genomic analyses were conducted using the UC Santa Cruz Genome Browser. Phylogeny studies investigated the evolutionary relationships of these genes and proteins. Human and other vertebrate SULF1 and SULF2 sequences were conserved, including signal peptides, metal (Ca2+) and substrate binding sequences, active site residues and N-glycosylation sites (sulfatase domain); and a C-terminal positively charged hydrophilic domain. Predicted 2D structures were identified for the sulfatase domain of vertebrate SULF1 and SULF2 using a bacterial phosphatase structure (PDB:4UPK). Vertebrate SULF1 and SULF2 genes usually contained 18/19 or 20 coding exons, respectively. Transcription factor binding sites and miR-binding sites were identified within the human SULF1 and SULF2 gene promoters and 3’-UTR regions, respectively. The Estrogen Receptor Gene (ESR1) was identified in the SULF2 promoter which may contribute to the higher expression level for this gene in female reproductive tissues. SULF1 and SULF2 genes and proteins were present in all vertebrate genomes examined. Phylogenetic analyses suggested that an ancestral invertebrate SUL1 gene underwent a gene duplication event to form two separate lines of vertebrate gene evolution: SULF1 and SULF2.