Recombinant Human Sucrase-isomaltase, intestinal (SI), partial

Code CSB-YP021285HU
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Source Yeast
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Code CSB-EP021285HU
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Source E.coli
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Code CSB-EP021285HU-B
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Source E.coli
Conjugate Avi-tag Biotinylated
E. coli biotin ligase (BirA) is highly specific in covalently attaching biotin to the 15 amino acid AviTag peptide. This recombinant protein was biotinylated in vivo by AviTag-BirA technology, which method is BriA catalyzes amide linkage between the biotin and the specific lysine of the AviTag.
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Code CSB-BP021285HU
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Source Baculovirus
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Code CSB-MP021285HU
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Source Mammalian cell
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Product Details

>85% (SDS-PAGE)
Target Names
Uniprot No.
Alternative Names
Isomaltase; MGC131621; MGC131622; Oligosaccharide alpha 1; 6 glucosidase ; SI; sucrase isomaltase alpha glucosidase; sucrase isomaltase; Sucrase-isomaltase; intestinal; SUIS_HUMAN
Homo sapiens (Human)
Protein Length
Tag Info
The following tags are available.
N-terminal His-tagged
The tag type will be determined during production process. If you have specified tag type, please tell us and we will develop the specified tag preferentially.
Lyophilized powder
Note: We will preferentially ship the format that we have in stock, however, if you have any special requirement for the format, please remark your requirement when placing the order, we will prepare according to your demand.
Buffer before Lyophilization
Tris/PBS-based buffer, 6% Trehalose, pH 8.0
We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Please reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL.We recommend to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20℃/-80℃. Our default final concentration of glycerol is 50%. Customers could use it as reference.
Troubleshooting and FAQs
Storage Condition
Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. Avoid repeated freeze-thaw cycles.
Shelf Life
The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.
Lead Time
Delivery time may differ from different purchasing way or location, please kindly consult your local distributors for specific delivery time.
Note: All of our proteins are default shipped with normal blue ice packs, if you request to ship with dry ice, please communicate with us in advance and extra fees will be charged.
Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.
Please contact us to get it.

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Target Background

Plays an important role in the final stage of carbohydrate digestion. Isomaltase activity is specific for both alpha-1,4- and alpha-1,6-oligosaccharides.
Gene References into Functions
  1. Three biosynthetic phenotypes for the novel SI mutations were identified. The first biosynthetic phenotype was defined by mutants that are intracellularly transported in a fashion similar to wild type SI and with normal, but varying, levels of enzymatic activity. The second biosynthetic phenotype was defined by mutants with delayed maturation and trafficking kinetics and reduced activity. The third is inactive. PMID: 28062276
  2. Novel compound heterozygote V577G/C1531W SI mutations, which lead to lack of SI expression in the duodenal brush border, were found in a family with congenital sucrase-isomaltase deficiency. PMID: 27749612
  3. A common mutation was found in the sucrase-isomaltase gene, c.273_274delAG, to be responsible for the high prevalence of congenital sucrase-isomaltase deficiency among Inuit people. PMID: 25452324
  4. SI mutations result in loss of enzyme function by preventing the biosynthesis of catalytically competent SI at the cell surface in lymphocytic leukemia PMID: 23418305
  5. study found four common mutations in the SI gene (3 of the 4 are in the sucrase domain, with 1 in the isomaltase domain) account for 59 percent of clinical symptoms of congenital sucrase-isomaltase deficiency (CSID); the remaining 41 percent were rare events PMID: 23103650
  6. investigation of EIS (enzyme-inhibitor-substrate) complex of sucrase: kinetic studies of complex formation/stability; role of complex in prevention of hyperglycemia by L-arabinose PMID: 21165628
  7. Core2 O-glycan structure is essential for expression of SI and DDP-IV during intestinal cell differentiation. PMID: 20841351
  8. These results suggest that sucrase-isomaltase transcription might be unchanged or lower in maturity-onset diabetes of the young (MODY) type 3, but greater in MODY5. PMID: 15522234
  9. phenylalanine cluster is required for shielding a folding determinant in the extracellular domain of SI; substitution of a Q by a P at residue 1098 of sucrase disrupts this determinant and elicits retention of SI(Q1098P) in ER and cis-Golgi PMID: 15944403
  10. The sucrase-isomaltase (SI) gene from 11 patients of Hungarian origin with congenital sucrase-isomaltase deficiency was analysed.In six out of the 11 patients the phenotype of CSID could be explained by compound heterozygosity. PMID: 16329100
  11. analysis of a mutation which affects an epitope responsible for the apical targeting fidelity of sucrase-isomaltase in congenital sucrase-isomaltase deficiency PMID: 16543230
  12. hepatocyte nuclear factor (HNF)-1alpha and HNF-1beta would contribute to constitutive expression of the SI gene in the differentiated state in Caco-2 cells PMID: 16802690
  13. glucose regulation of sucrase-isomaltase gene expression was attenuated in HNF-1alphaT539fsdelC cells, but was well maintained in empty vector & HNF-1betaR177X cells.Results suggest that HNF-1alpha participates in glucose regulation of SI gene expression. PMID: 17194452
  14. The effects of mutations in the sucrase domain of SIC1229Y and SIF1745C indicate the importance of a direct interaction between isomaltase and sucrose and the role of sucrose as an intermolecular chaperone in the intracellular transport of SI PMID: 19121318

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Involvement in disease
Congenital sucrase-isomaltase deficiency (CSID)
Subcellular Location
Apical cell membrane; Single-pass type II membrane protein. Note=Brush border.
Protein Families
Glycosyl hydrolase 31 family
Tissue Specificity
Expressed in the poorly differentiated crypt cells of the small intestine as well as in the mature villous cells. Expressed at very low levels in the colon.
Database Links

HGNC: 10856

OMIM: 222900

KEGG: hsa:6476

STRING: 9606.ENSP00000264382

UniGene: Hs.429596

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