Human serum albumin

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• 그림문자(GHS)

  

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Human serum albumin 화학적 특성, 용도, 생산

• 개요

  Albumin is a known carrier of fatty acids (FA). Thus control over specific FA′s for cell culture is important, as different cell lines can differ in their sensitivity to particular fatty acids. Fatty acid-free human serum albumin (HSA) is therefore useful for cell culture studies where specific fatty acid content must be strictly controlled, so that researchers can use particular fatty acids specific to their cell lines. Fatty acid-free albumin also allows for optimal and maximum binding sites for using specific fatty acids in cell culture. The use of FA-free HSA also addresses concerns about endogenous FA′s potentially in non-FA-free HSA.

• 화학적 성질

  solid

• 용도

  Albumin from human serum has been used in the preparation of glycated human serum albumin (gHSA) in a glucose solution. It has also been used in the study to estimate the impact of surface nanotopography and chemical composition on blood compatibility.

• 주요 응용

  Albumin from human serum has been used in the preparation of glycated human serum albumin (gHSA) in a glucose solution. It has also been used in the study to estimate the impact of surface nanotopography and chemical composition on blood compatibility.
  Albumin was used to test its effect on the in vitro bactericidal activity of cefditoren against penicillin-resistant Streptococcus pneumonia. It has been clinically used in serious and often life-threatening conditions, such as shock and blood loss due to trauma, burns, and surgery. It was used also to test the effect of non-enzymatic glycation on the unfolding of human serum albumin.

• 일반 설명

  Prepared under non-denaturing conditions by a modification of the Cohn procedure.

• Synthesis

  The synthesis of human serum albumin (HSA) comprises both in vivo and in vitro pathways. In vivo, HSA is synthesized exclusively by the liver: its mRNA encodes a 609-amino-acid precursor, pre-pro-albumin, which enters the endoplasmic reticulum, where the N-terminal 18-amino-acid signal peptide is rapidly cleaved, followed by removal of the N-terminal basic 6-amino-acid pro-peptide just before secretion, yielding the mature non-glycosylated monomer of 585 amino acids with a molecular mass of about 66.5 kDa; a healthy adult liver synthesizes approximately 13.8 g of albumin per day, accounting for about 25% of total hepatic protein synthesis[1].
  In vitro, recombinant HSA was produced in E. coli by cloning the full coding sequence of mature HSA from a human liver cDNA library into expression plasmids such as pXL276 and its derivatives (with the PL promoter replacing the trp promoter); the recombinant protein was mainly produced as insoluble aggregates, which were resolubilized, refolded by 100-fold slow dilution into refolding buffer, and purified by anion-exchange FPLC with an average final yield of about 40% at laboratory scale[2]. To obtain an authentic N-terminus, a fusion strategy was adopted in which the first six residues of phage λcII protein were fused to mature HSA to boost expression; after refolding, the fusion protein was cleaved in vitro with catalytic amounts of trypsin (<1/1000 w/w), releasing a mature recombinant HSA whose unique N-terminal sequence matched native HSA, and the product was indistinguishable from native HSA by amino acid composition, UV absorption spectroscopy, electrophoretic and chromatographic analyses.

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