Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.5.1.12 (biotinidase)
 392 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Biotinidase has been purified from human serum to a specific activity of 1900 units/mg protein by a five-step procedure. After ammonium sulfate precipitation (33-55% cut) it was purified by DEAE-Sephacel, hydroxylapatite, octyl-Sepharose CL-4B, and Sephadex G-100 chromatography. The purified enzyme showed a single silver staining band with polyacrylamide gel electrophoresis under denaturing and non-denaturing conditions. Biotinidase is a glycoprotein. The sialic acid residues in the molecule are not required for enzyme activity. The Mr of human serum biotinidase estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (Ferguson plot) and by sedimentation analysis was 68,000. Human serum biotinidase showed maximum activity in the pH range 6.0 to 7.5 with N-(d-biotinyl) p-aminobenzoate as substrate. However, with biocytin as substrate, the maximal activity of the enzyme was in the pH range 4.5 to 6.0. Using structural analogs of the substrate we have shown that biotinidase is not a general proteolytic enzyme and has specific structural requirements in the substrate for hydrolysis.
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PMID:Purification and characterization of human serum biotinidase. 394 11

We report here a novel glycosylphosphatidyl-inositol (GPI)-anchored glycoprotein on human leukocytes. Treatment of neutrophils with a mAb (3H9) to this molecule sequentially up-regulates and down-regulates beta2 integrin-dependent adhesion of these cells as well as their transendothelial migration in vitro. In addition, this mAb simultaneously modulates the avidity of beta2 integrin for its ligand, iC3b, with kinetics similar to those observed in 3H9 modulation of neutrophil adherence. This mAb also induces beta2 integrin-dependent cytoskeletal remodeling. This novel GPI-anchored protein (GPI-80) is highly homologous with Vanin-1, a recently reported GPI-anchored protein that is expressed on perivascular thymic stromal cells and is involved in thymus homing in mice. The finding that both GPI-80 and Vanin-1 are 40% homologous with human biotinidase suggests the existence of a biotinidase superfamily of molecules that may be involved in the regulation of leukocyte trafficking.
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PMID:A novel glycosylphosphatidyl inositol-anchored protein on human leukocytes: a possible role for regulation of neutrophil adherence and migration. 1020 59

West's syndrome (WS), which is also known as infantile myoclonic encephalopathy with hypsarrhythmia, is one of the generalized epileptic syndromes with a cryptogenic or symptomatic origin. It is an age-dependent epileptic syndrome. The latest neuroimaging techniques have enabled us to gain a better understanding of its physiopathology and to identify new aetiological factors responsible for the clinical symptoms. WS can be due to a number of aetiologies, the most notable of which are congenital errors of metabolism. The incidence of cases due to phenylketonuria or hypoglycaemia is currently diminishing, yet, there is a rise in the number of new metabolic diseases that are responsible for the symptoms of WS. These include the carbohydrate-deficient glycoprotein syndromes or biotinidase deficiency. In all cases, and especially so in those that are idiopathic, it is wise to conduct exhaustive aetiological studies, since on some occasions metabolic diseases will be shown to be responsible, and this will then modify the prognosis, therapy and genetic counselling. It is important to have a protocol for both study and therapy available for this syndrome. The therapeutic options available can be implemented after ruling out a neurometabolic disease as being responsible for the syndrome and quickly beginning treatment with vigabatrine, sodium valproate plus pyridoxine, ACTH or hydrocortisone. If there is no response then topiramate can be used. Other therapeutic options, such as the use of zonisamide, a ketogenic diet or even surgical treatment, are also analyzed.
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PMID:[West's syndrome. Analysis, aetiological factors and therapeutic options]. 1453 11