As a typical dwelled tidal shellfish, Sinonovacula constricta is often exposed to sulfide-rich environment and shows strong sulfide tolerance. The cytosolic sulfotransferase 1B1 (SULT1B1) is located at downstream of the sulfur metabolism pathway, while it is a key enzyme catalyzing the sulfation reaction and plays an important role in the biotransformation of endogenous substances such as thyroid hormones (THs). In order to study the role of ScSULT1B1-12 in sulfur resistance, the sequence characteristics were analyzed by bioinformatics method. Combined with the changes of blood ${\rm {SO}} _4^{2-} $ concentration, the spatial expression and temporal expression profiles during 72 h sulfide stress (50 μmol/L, 150 μmol/L, 300 μmol/L) were studied. The full-length cDNA of ScSULT1B1-12 gene was 1 100 bp, containing an open reading frame of 897 bp, and encoding 298 amino acids. Sequence analysis showed that ScSULT1B1-12 contains four catalytic active sites (56K, 104N, 106H, and 134A), one PAPS binding domain (YPKSGTXW) at N terminal, and one PAPS binding and dimerization domain (RKGXXGDWKNXFTVXXE) at C terminal, indicating that it was structurally able to catalyze the sulfation reaction. Spatial expression showed that ScSULT1B1-12 was highly expressed in gills, followed by the adductor muscle and hepatopancreas. Blood ${\rm {SO}} _4^{2-} $ concentration decreased, and the expression patterns of ScSULT1B1-12 also declined with fluctuation after sulfide stress, indicating that sulfate can be further transformed to sulfated donors, and ScSULT1B1-12-mediated sulfation may be inhibited to keep THs at a certain level in S. constricta, in order to strengthen the metabolic and immune functions, and make the organism adapt the adverse environment of high sulfide.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |