Anti·His Antibodies, BSA-free

For sensitive detection of His-tagged proteins with an RGS·His or HHHH epitope


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RGS·His Antibody, BSA-free (100 µg)

Cat. No. / ID:  34650

100 µg mouse anti·RGS(H)4 (lyophilized, BSA-free, for 1000 mL working solution)
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Anti·His Antibodies, BSA-free are intended for molecular biology applications. These products are not intended for the diagnosis, prevention, or treatment of a disease.

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✓ Knowledgeable and professional Product & Technical Support

✓ Fast and reliable (re)-ordering


  • Highly specific detection of C-terminal, N-terminal and internal His tags
  • Highly sensitive and specific detection of RGS·His epitopes
  • Highly sensitive and specific detection of HHHHH epitopes

Product Details

Monoclonal mouse Anti·His Antibodies (5xHis antibodies and 4xHis antibodies), like the RGS·His Antibody, BSA-free, Tetra·His Antibody, BSA-free and Penta·His Antibody, BSA-free are used to detect recombinant protein carrying His tags. Each of the three variants detects a different His tag epitope. Like all QIAGEN mouse monoclonal antibodies, they are prepared under serum-free conditions, which guarantees the absence of viruses, mycoplasma and contaminating immunoglobulins.


Many different proteins have been detected, via their His tags, using QIAexpress Anti·His Antibodies (5xHis antibodies and 4xHis antibodies) (see table “Performance of Anti∙His Antibodies”). For the sensitivity of the three Anti·His Antibodies in detecting this panel of proteins see the figure  “Sensitivity of QIAexpress Anti·His Antibodies”). Anti·His Antibodies enable identification of positive expression clones by colony blotting (see figure  “Identification of positive expression clones by colony blotting”) and detection of His-tagged thioredoxin (see figure  “His-tagged thioredoxin detected by Penta·His Antibody in yeast cells”). The antibodies are also ideally suited for use in immunohistochemistry procedures (see figure  “Immunohistochemistry with Penta·His Antibodies”).

Performance of Anti∙His Antibodies

Feature RGS·His Antibody, BSA-free Tetra·His Antibody, BSA-free and Penta·His Antibody, BSA-free
Detection N-terminal His tags (containing the epitope RGSHHHH) N-terminal, C-terminal and internal 4xHis (Tetra·His Antibody, BSA-free) or 5xHis tags (Penta·His Antibody, BSA-free)
Epitope detected RGSHHHH HHHH (Tetra·His Antibody, BSA-free) or HHHHH (Penta·His Antibody, BSA-free)
Sensitivity in dot blots* 0.5 ng 0.5 ng
Sensitivity in western blots* 2 ng 2 ng
Isotype Mouse IgG1 Mouse IgG1
Cross-reactivity Negligible with crude E. coli, yeast, mammalian or insect cell lysates Negligible with crude E. coli, yeast, mammalian or insect cell lysates
Form Lyophilized Lyophilized
Working solution 1000 mL 1000 mL

Proteins detected with QIAexpress Anti∙His Antibodies

  Protein Tag location Sequence
C Thioredoxin N-terminus MRGSHHHHHHGSSDKIIHLT..........
D TNF-α N-terminus MRHHHHHHQSTESMIRDV.........
F Chaperonin C-terminus ..........AKIAKDGSRSHHHHHH
G DNA polymerase C-terminus ..........EDWLSAKERSHHHHHH


See figures


The QIAexpress System provides materials for the expression, purification, detection and assay of 6xHis-tagged proteins. For detection, QIAexpress mouse monoclonal antibodies are produced under conditions that guarantee the highest purity and activity. Hybridoma cell culture is carried out under serum-free conditions, ensuring that the preparations are free of viruses, mycoplasma and contaminating immunoglobulins. Purification by adsorption chromatography is performed entirely at physiological pH, yielding preparations with the highest proportion of native antibody.


The QIAexpress, Detection and Assay Handbook, supplied with all QIAexpress detection and assay products, contains detailed example protocols and guidelines for designing and performing assays.


QIAexpress Detection Systems, including RGS·His Antibody, BSA-free, Tetra·His Antibody, BSA-free and Penta·His Antibody, BSA-free allow efficient detection of His-tagged proteins and are ideal for many applications, including:

  • Colony, dot and western blotting procedures
  • Screening for positive expression clones
  • Monitoring expression levels and stability of His-tagged proteins
  • Immunoprecipitation and ELISA
  • Immunocytochemistry and immunohistochemistry

Supporting data and figures


Kit Handbooks (1)
For Anti·His Antibodies, Anti·His HRP Conjugates, Penta·His™ Alexa Fluor® Conjugates, Penta·His Biotin Conjugate, Ni-NTA Conjugates, Tag·100™ Antibody, Streptavidin–R-PE, 6xHis Protein Ladder, Ni-NTA HisSorb™ Strips and Plates 
Supplementary Protocols (1)
Certificates of Analysis (1)


Localization of the gD-binding region of the human herpes simplex virus receptor, HveA.
Whitbeck JC; Connolly SA; Willis SH; Hou W; Krummenacher C; Ponce de Leon M; Lou H; Baribaud I; Eisenberg RJ; Cohen GH;
J Virol; 2001; 75 (1):171-80 2001 Jan PMID:11119586
Multiple sulfatase deficiency is caused by mutations in the gene encoding the human C(alpha)-formylglycine generating enzyme.
Dierks T; Schmidt B; Borissenko LV; Peng J; Preusser A; Mariappan M; von Figura K;
Cell; 2003; 113 (4):435-44 2003 May 16 PMID:12757705
Screening for soluble expression of recombinant proteins in a 96-well format.
Knaust RK; Nordlund P;
Anal Biochem; 2001; 297 (1):79-85 2001 Oct 1 PMID:11567530
A human cDNA expression library in yeast enriched for open reading frames.
Holz C; Lueking A; Bovekamp L; Gutjahr C; Bolotina N; Lehrach H; Cahill DJ;
Genome Res; 2001; 11 (10):1730-5 2001 Oct PMID:11591650
Phosphorylation of the vesicle-tethering protein p115 by a casein kinase II-like enzyme is required for Golgi reassembly from isolated mitotic fragments.
Dirac-Svejstrup AB; Shorter J; Waters MG; Warren G;
J Cell Biol; 2000; 150 (3):475-88 2000 Aug 7 PMID:10931861


How should I dissolve the lyophilized Anti-His and Tag Antibodies?
Dissolve the lyophilized Anti-His Antibodies (100 µg) in 500 µl water per vial. The final concentration is 0.2 mg/ml. Dissolve the Anti-His Antibody Selector Kit antibodies (3 µg) in 15 µl water per tube (final concentration, 0.2 mg/ml).
What epitopes do the Anti-His Conjugates and Anti-His Antibodies recognize?

The table below lists the epitopes recognized by the Anti-His Conjugates and Anti-His Antibodies. 'H' designates a histidine residue, while 'X' designates any amino acid other than histidine. Note that individual 6xHis-tagged proteins are often recognized better by one Anti-His Antibody than by the others, possibly because of subtle differences in the exact conformation of the 6xHis tag and other parts of the protein in the vicinity of the tag. To choose the optimal antibody for your specific 6xHis-tagged protein and application, QIAGEN offers the Anti-His Antibody Selector Kit. The kit includes 3 µg of each of the three antibodies for direct comparison and economical selection of the one that gives the best results.

Epitopes recognized by QIAexpress Anti-His HRP Conjugates and Anti-His Antibodies

Peptide Penta-His Tetra-His RGS-His
+ +
+ +
+ +
+ + +

Note that the presence of specific residues N- or C-terminal to the epitope is not required.

FAQ ID -170
Which Anti-His Antibody is the most sensitive for my protein of interest?

Penta-His and Tetra-His Antibody bind to proteins that have 6xHis tags regardless of the surrounding amino-acids, even when the tag is partially hidden. Subtle differences in the antigen recognition sites of these antibodies mean that some 6xHis-tagged proteins are detected with higher sensitivity by one Anti-His Antibody than by the others (see figure below). Therefore, to achieve optimum results, we recommend comparison of these antibodies in parallel for new applications and proteins. QIAGEN offers the Anti-His Antibody Selector Kit for this purpose.


Sensitivity of QIAexpress Anti·His Antibodies


Note:  RGS His Antibody regonizes the RGS(His)4 epitope that is found on proteins endcoded by most pQE vectors as well as several pRSETan pBlue BacHis -vectors from Invitrogen.

FAQ ID -172
What are the dissociation constants for the Anti-His Antibodies?

Anti·His Antibody epitopes and dissociation constants

Antibody Epitope Dissociation constant Kd (M)*
RGS·His Antibody RGSHHHH 1 x 10–8 – 5 x 10–8
Penta·His Antibody HHHHH 5 x 10–8 – 1 x 10–9
Tetra·His Antibody HHHH 1 x 10–8 – 5 x 10–8

* Dissociation constants were measured using surface plasmon resonance (BIACORE) technology. The exact value of Kd is dependent on the individual 6xHis-tagged protein.

FAQ ID -385
Are QIAGEN monoclonal Anti His Antibodies glycosylated?
Yes, QIAGEN antibodies are glycosylated to a low extent. We did not determine whether this is N-glycosylation or O-glycosylation. Furthermore, we do not know, if the glycosylation pattern does change, since we do not measure it. Glycosylation does not have any impact onto the function of the antibody. If customers want to use the glycosylchains for coupling reactions we know that this is very difficult to do.
FAQ ID -334
How is an antibody epitope determined?
This is done via epitope mapping. The antibody in question is first tested against different protein fragments and peptides. Once the amino acids detected by the antibody are determined, the surrounding amino acids can be exchanged to reveal the influence of the environment on the detection of a specific epitope.
FAQ ID -593
What blocking reagents do you recommend for chemiluminescent detection using Penta-, Tetra-, and RGS-His antibodies?

Please do not use buffer containing milk powder to block the Western Blot. This will reduce sensitivity. QIAGEN recommends use 3% BSA in TBS-buffer to block the membrane and for incubation of the Anti His Antibody on the membrane. For the binding of the secondary Antibody BSA does not sufficiently block and therfore 10% milk powder in TBS-buffer should be used at this step only. Alternatively, if alkali-soluble casein (Merck, Cat. No. 1.02241) is available in your country it can be used as a blocking reagent throughout the chemiluminescent detection protocol. Please see Table 9 of the QIAxpress Detection and Assay Handbook for additional information.

FAQ ID -1093
What is the difference between BSA-free and BSA-containing RGS-His Antibody?

BSA stabilizes the RGS-His Antibody. We recommend to use the BSA-containing RGS-His Antibody for all standard procedures like dot blots, western blots, etc.. In cases where BSA may interfere with the application, e.g. coupling reactions, the RGS-His Antibody, BSA-free is recommended.

The Tetra-His and Penta-His Antibodies are stable without BSA, and therefore are only offered BSA-free.

FAQ ID -569
How should I store Anti·His and Tag·100 Antibodies?
QIAGEN Anti·His Antibodies should be stored lyophilized until they are to be used. They can be stored lyophilized for 1 year at 2–8°C. In solution they can be stored for 3 months at 2–8°C or for up to 6 months in aliquots at –20°C. Avoid repeated freezing and thawing.
FAQ ID -194