Exalpha Biologicals, Inc.

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FIX&PERM Cell Fixation and Permeabilization Kit

Flow cytometric analyses with monoclonal antibodies were so far mainly restricted to cell surface molecules. Intracellular structures such as cytoplasmic or nuclear enzymes, oncoproteins, cytokines, immunoglobulins etc. were largely excluded from such studies. Also excluded from flow cytometric studies were cytoplasmic localizations of well-established membrane molecules like CD3 and CD22, which, in their cytoplasmic form, are the most reliable lineage markers in undifferentiated leukemia. With the FIX&PERM® Kit flow cytometric analysis of intracellular antigens has become as easy as surface antigen studies. The only prerequisite is the availability of suitable antibody conjugates. Most of the available monoclonal antibody conjugates can be used with the FIX&PERM® Kit, some determinants are sensitive, however, to the fixation step involved. This and the optimal fixation time have to be tested for each reagent.


Welcome, Peter Rutten

We are pleased to announce that Peter Rutten has now started in his role as Operations Director here at Exalpha Biologicals Inc. Peter has a Master’s of Science degree in Industrial and Organizational Psychology and this has lead him down a very business orientated career path. Peter is looking forward to working with the team at Exalpha. Peters primary focus is the customer experience and he will be working with the Laboratory team, the Quality Control team and the Order Processing team to ensure this focus is achieved. We all wish Peter well in his new role.

Exalpha Biologicals, Inc.

Proprotein convertase subtilisin/kexin type 9 (PCSK9), LDLR-binding epitope blocking

  • Product Code: X2740P
  • Size: 100 µg
  • Availability: In Stock In Stock
  • Price (USD): $244

Cat #

X2740P		 Quantity:      

Data Sheet

Product Name

Proprotein convertase subtilisin/kexin type 9 (PCSK9), LDLR-binding epitope blocking


Proprotein convertase PC9, Subtilisin/kexin-like protease PC9, Neural apoptosis-regulated convertase 1





Product Type

Antigen Immunoaffinity Purified Polyclonal




Western Blot, Functional epitope reported to block PCSK9-LDLR interaction. ELISA


Antigen Immunoaffiinity Purification


100 µg

Price (USD)



This anitbody is made to an epitope that is reported to block the PCSK9-LDLR (low density lipoprotein receptor) interaction. PCSK9 binds to the EGF-A domain of the LDLR and signals LDLR degradation. Reduced LDLR levels result in decreased LDL (low density lipid) metabolism leading to hypercholesterolemia. Additioanlly, PCSK9 may be implicated in the differentiation of cortical neurons and may also play a role in cholesterol homeostasis. Defects in PCSK9 gene are the cause of familial hypercholesterolemia 3 (FH3). The protein is thought to play a central role in cholesterol homeostais


Synthetic peptide derived from the human PCSK9 protein reported to block PCSK9-LDLR interaction.

Positive Control

Expressed in neuro-epithelioma, colon carcinoma, hepatic and pancreatic cell lines, and in Schwann cells.


Provided as solution in phosphate buffered saline with 0.08% sodium azide

Customer Storage

Product should be stored at -20°C. Aliquot to avoid freeze/thaw cycles

Target Molecular Weight

73 kDa

Product Image

Image Legend

Staining of Hep G2 cells with PCSK9 antibody (Cat. No. X2470P) at 2 µg/ml.

Database Links:



1. Proc Natl Acad Sci U S A. 2003 Feb 4;100(3):928-33. Epub 2003 Jan 27. The secretory proprotein convertase neural apoptosis-regulated convertase 1 (NARC-1): liver regeneration and neuronal differentiation. Seidah NG, et al
2. Nat Genet. 2003 Jun;34(2):154-6. Mutations in PCSK9 cause autosomal dominant hypercholesterolemia. Abifadel et al
3. Hum Mutat. 2005 Nov;26(5):497. Novel mutations of the PCSK9 gene cause variable phenotype of autosomal dominant hypercholesterolemia. Allard D et al
4. Am J Hum Genet. 2006 Mar;78(3):410-22. Epub 2006 Jan 20. A spectrum of PCSK9 alleles contributes to plasma levels of low-density lipoprotein cholesterol. Kotowski IK, et al
5. Clin Genet. 2004 May;65(5):419-22. Mutations in the PCSK9 gene in Norwegian subjects with autosomal dominant hypercholesterolemia. Leren TP.
6. PLoS One. 2007 Oct 31;2(10):e1098. Evidence for positive selection in the C-terminal domain of the cholesterol metabolism gene PCSK9 based on phylogenetic analysis in 14 primate species. Ding K, McDonough SJ, Kullo IJ.
7. J Hum Genet. 2004;49(2):109-14. Epub 2004 Jan 15. Genetic variants in PCSK9 affect the cholesterol level in Japanese. Shioji K, et al
8. Atherosclerosis. 2005 Oct;182(2):331-40. Genetic screening protocol for familial hypercholesterolemia which includes splicing defects gives an improved mutation detection rate. Graham CA et al
9. Cell. 2006 Nov 3;127(3):635-48. Global, in vivo, and site-specific phosphorylation dynamics in signaling networks. Olsen J V et al
10. J Am Coll Cardiol. 2005 May 17;45(10):1611-9. Epub 2005 Apr 21. A common PCSK9 haplotype, encompassing the E670G coding single nucleotide polymorphism, is a novel genetic marker for plasma low-density lipoprotein cholesterol levels and severity of coronary atherosclerosis. Chen SN et al