Invitrogen™ HLA-DR Monoclonal Antibody (TU36), Qdot™ 655

Catalog No.	Quantity
50-113-7567	25 μL

Catalog No. 50-113-7567 Supplier Invitrogen™ Supplier No. Q22158

Description

Mouse Monoclonal Antibody

HLA-DR Monoclonal Antibody for Flow

HLA-DR, like other MHC class II molecules, is a transmembrane glycoprotein composed of a 36 kDa alpha chain (DRA) and 27 kDa beta chain (DRB). The alpha chain gene contains 5 exons. Exon 1 encodes the leader peptide, exons 2 and 3 encode the two extracellular domains, and exon 4 encodes the transmembrane domain and the cytoplasmic tail. DRA does not have polymorphisms in the peptide binding part and acts as the sole alpha chain for DRB1, DRB3, DRB4 and DRB5. Within the DR molecule the beta chain contains all the polymorphisms specifying the peptide binding specificities. Hundreds of DRB1 alleles have been described and typing for these polymorphisms is routinely done for bone marrow and kidney transplantation. HLA-DR is expressed primarily on antigen presenting cells such as B lymphocytes, monocytes, macrophages, thymic epithelial cells and activated T lymphocytes. Three loci, DR, DQ and DP, encode the major expressed products of the human class II region. The human MHC class II molecules bind intracellularly processed peptides, present them to T-helper cells, and have a critical role in the initiation of the immune response. HLA and MHC antibodies play a significant role in Immunopeptidomics, facilitating the identification and characterization of neoantigens through high-performance liquid chromatography coupled to tandem Mass Spectrometry.

Specifications

• Antigen: HLA-DR
• Applications: Flow Cytometry
• Classification: Monoclonal
• Clone: TU36
• Conjugate: Qdot 655
• Formulation: 0.05M borate with 1M betaine and 0.05% sodium azide; pH 8.3
• Gene: HLA-DRB4
• Gene Accession No.: P01903, P01911, P04233, P13762, P79483, Q30154
• Gene Alias: AI323765; BLA-DRB3; BOLA-DRA; BoLA-DR-alpha; BoLA-DRB; BOLA-DRB3; BoLA-DRB3 protein; BoLA-DRB3.2; Bota-DRB01; Bota-DRB02; Bota-DRB04; Bota-DRB07; Bota-DRB21; Bota-DRB22; bovine leukocyte antigen; Cd74; CD74 antigen; CD74 antigen (invariant polypeptide of major histocompatibility complex, class II antigen-associated); CD74 molecule; Cd74 molecule, major histocompatibility complex, class II invariant chain; class II-associated invariant chain peptide; CLIP; Clone P2-beta-3; DASS-397D15.1; DHLAG; dinucleotide microsatellite; DLA class II histocompatibility antigen, DR-1 beta chain; DLA DRBB1 beta chain; DLA-DR beta; DLA-DRB1; DLA-DRBB1; DR beta-5; DR beta-chain antigen binding domain; DR-16; DR2-beta-2; DR4; DR-4; DR7; DR9; DR-9; DRB; DRB1; DRB1 transplantation antigen; DRB3; DRB4; DRBB1; DR-beta chain; DR-beta chain MHC class II; DRw10; Dw2; DW2.2/DR2.2; E-alpha-f; FLJ51114; FLJ75017; FLJ76359; gamma chain of class II antigens; H-2 class II histocompatibility antigen gamma chain; H-2 class II histocompatibility antigen, E-D alpha chain; H-2 class II histocompatibility antigen, E-K alpha chain; H-2 class II histocompatibility antigen, E-U alpha chain; H-2Ea; H2-Ea; H2-Ea-ps; H2-IE-alpha; histocompatibility 2, class II antigen E alpha; histocompatibility 2, class II antigen E alpha, pseudogene; histocompatibility antigen HLA-DR alpha; histocompatibility complex, class II, DR beta 3; histocompatibility: class II antigens, gamma chain of; HLA class II histocompatibility antigen gamma chain; HLA class II histocompatibility antigen, DR alpha chain; HLA class II histocompatibility antigen, DR beta 3 chain; HLA class II histocompatibility antigen, DR beta 4 chain; HLA class II histocompatibility antigen, DR beta 5 chain; HLA class II histocompatibility antigen, DR-1 beta chain; HLA class II histocompatibility antigen, DR-5 beta chain; HLA class II histocompatibility antigen, DRB1-15 beta chain; HLA class II histocompatibility antigen, DRB1-16 beta chain; HLA class II histocompatibility antigen, DRB1-3 chain; HLA class II histocompatibility antigen, DRB1-7 beta chain; HLA class II histocompatibility antigen, DRB1-9 beta chain; HLADG; HLA-DR antigens-associated invariant chain; HLA-DR1B; HLA-DR3B; HLA-DR4B; HLA-DRA; HLA-DRA1; HLA-DRB; HLA-DRB1; HLA-DRB2; HLA-DRB3; HLA-DRB4; HLA-DRB5; HLA-DR-gamma; human leucocyte antigen DRB1; human leucocyte antigen DRB3; human leucocyte antigen DRB4; human leucocyte antigen DRB5; ia antigen-associated invariant chain; Ia3; Ia-3; Ia-associated invariant chain; Ia-GAMMA; I-E alpha MHC class II; I-Ealpha; II; integral membrane glycoprotein; invariant gamma chain; invariant polypeptide of major histocompatibility complex, class II antigen-associated; INVG34; LA-DRB; leukocyte antigen; leukocyte antigen class II; leukocyte antigen DRB3; lymphocyte antigen DRB1; major histocompatibility complex class II DR-beta chain; major histocompatibility complex, class II, DR alpha; major histocompatibility complex, class II, DR alpha precursor; major histocompatibility complex, class II, DR beta 1; major histocompatibility complex, class II, DR beta 3; major histocompatibility complex, class II, DR beta 4; major histocompatibility complex, class II, DR beta 4 precursor; major histocompatibility complex, class II, DR beta 5; major histocompatibility complex, class II, DRB3; MHC cell surface glycoprotein; MHC class I antigen; MHC class II antigen; MHC class II antigen beta chain; MHC class II antigen BoLA-DRB3; MHC class II antigen DR beta 3 chain; MHC class II antigen DRA; MHC class II antigen DRB1*15; MHC class II antigen DRB1*16; MHC class II antigen DRB1*3; MHC class II antigen DRB1*9; MHC class II antigen DRB3; MHC class II antigen DRB4; MHC class II antigen DRB5; MHC class II antigen E alpha; MHC class II antigen HLA-DR-beta; MHC class II DLA DRB1 beta chain; MHC class II DLA-DRB; MHC class II DLA-DR-beta-1; MHC class II DR beta 1; MHC class II DR beta chain; MHC class II DR beta-chain
• Gene Symbols: CD74, HLA-DRA, HLA-DRB1, HLA-DRB3, HLA-DRB4, HLA-DRB5
• Host Species: Mouse
• Immunogen: Human HLA-DR.
• Purification Method: Purified
• Quantity: 25 μL
• Regulatory Status: RUO
• Primary or Secondary: Primary
• Gene ID (Entrez): 3122, 3123, 3125, 3126, 3127, 972
• Target Species: Human
• Content And Storage: 4°C
• Product Type: Antibody
• Form: Liquid
• Isotype: IgG2b

Frequently Asked Questions (FAQs)

What is the best way to remove white precipitate from my ITK Qdot nanocrystals?

Spinning your ITK Qdot nanocrystals at approximately 3,000 rpm for 3-5 minutes should remove the white precipitate from the supernatant. Use the supernatant immediately.

I see a white precipitate in my ITK Qdot nanocrystals; should I be concerned?

The precipitate in the organic ITK Qdot nanocrystals occurs with some frequency. The ITK Qdot nanocrystals sometimes include impurities that show as a white precipitate.

Why do my Qdot nanocrystals appear to be blinking?

Blinking is an inherent property of quantum dots; in fact, all single-luminescent molecules blink, including organic dyes. The brightness and photostability of Qdot nanocrystals makes the blinking more visibly apparent. Under higher energy excitation, Qdot nanocrystals blink even faster.

My Qdot nanocrystals were brightly fluorescent before I mounted my samples; now I'm seeing a loss of fluorescence. Why is this happening?

Appropriate mounting media selection is very important to retain the fluorescence of Qdot nanocrystals. In our studies, Qdot nanocrystals work best with the following mountants:

HistoMount medium (Cat No. 00-8030); best for long term archiving
Cytoseal 60 Mountant
Clarion Mountant
Most polyvinyl alcohol-based mountants (limited storage time, less than weeks)
Water-based mountants (limited storage time, less than week)
Up to 50% glycerol (limited storage time, less than week)
Note: We do not recommend using ProLong mounting media with Qdot nanocrystals as it will quench their fluorescence.

Why can't I freeze my Qdot nanocrystal solution?

Freezing will cause the product to aggregate. The Qdot nanocrystals cannot be dispersed into solution after aggregation.

My Qdot product is completely aggregated; how do I disperse the aggregates?

Once your product undergoes aggregation, it cannot be dispersed back into solution. We recommend purchasing a new product.

I see a small amount of aggregation in my Qdot product even though I stored it correctly. Why is this happening?

You may occasionally observe a small amount of aggregation of the Qdot nanocrystals during proper storage. To remove any aggregates that may have formed prior to use, we recommend centrifuging the vial at 2,000 x g for 1 min. Pipette only the supernatant and avoid the pellet. In our experience, pelleting any aggregates that may have formed typically results in a loss of less than 10% of the product.

Do the quantum dots undergo FRET, or quench when they are in close proximity?

We have not systematically investigated the energy transfer properties of the quantum dots, though the quantum dots may have useful properties as both energy transfer donors and acceptors. We have investigated the fluorescence of Qdot 605 Streptavidin conjugates that are coupled to each other through a bis-biotin linker, and found that the emission intensity of the materials was unperturbed at any concentration of biotin cross-linker. These results suggest that the interparticle quenching of these Qdot conjugates is negligible.

How should I dispose of the Qdot products?

The Qdot products contain cadmium and selenium (and tellurium, in the larger particles) in an inorganic crystalline form. We can only advise that you dispose of the material in compliance with all applicable local, state, and federal regulations for disposal of these classes of material. For more information on the composition of these materials, consult the Material Safety Data Sheet.

Are the quantum dots toxic?

We have not investigated the toxicity of the Qdot nanocrystals. The materials are provided in a solution which is approximately 2 mM total Cd concentration. We have demonstrated the utility of these materials in a variety of live-cell in vitro labeling experiments, but do not have systematic data investigating the toxicity of the materials to humans, to animals, or to cells in culture.

How many molecules of antibody, streptavidin, and biotin are conjugated to one Qdot nanocrystal?

The number of molecules conjugated to one Qdot nanocrystal is based on the ratio of quantum dot:molecule used in the conjugation, the number of available binding sites on the Qdot nanocrystal, and the size of both the Qdot nanocrystal and the molecule of interest. In general, there are 2-3 antibodies, 4-5 biotin molecules, and 6-8 streptavidin molecules per Qdot nanocrystal.

What is the difference between an ITK Qdot nanocrystal product and a standard Qdot nanocrystal product?

ITK Qdot nanocrystals use the original formulation of outer polymer provided in the first generation of the Qdot products; except for the Amine-PEG products, the outer polymer does not include PEG. The outer polymer of the standard Qdot nanocrystals includes PEG.

How many functional groups (amino or carboxyl) are loaded onto each Qdot ITK nanocrystal? How do you estimate the number of functional groups?

There are approximately 80-100 functional groups of each Qdot ITK nanocrystal. We use a type of immunosorbent assay to determine the EC50 of each conjugate.

I don't have a filter optimized for visualizing Qdot nanocrystals. Can I visualize them using a standard filter?

Yes, you can visualize Qdot nanocrystals using a standard filter; they will excite at any wavelength below their emission. Keep in mind that the lower the excitation value the brighter the Qdot nanocrystal fluorescence output.

What mounting media should I use with Qdot nanocrystals?

Qdot nanocrystals do not require the use of antifades as they do not photobleach or fade in the same manner as a chemical dye. In our studies, Qdot nanocrystals work best with the following mountants:

- HistoMount medium (Cat No. 00-8030); best for long-term archiving
- Cytoseal 60 Mountant
- Clarion Mountant
- Most polyvinyl alcohol-based mountants (limited storage time, less than a week)
- Water-based mountants (limited storage time, less than a week)
- Up to 50% glycerol (limited storage time, less than a week)
Note: We do not recommend using ProLong or SlowFade mounting media with Qdot nanocrystals.

In what solvents are Qdot nanocrystals stable?

Hydrophilic Qdot nanocrystals are stored and shipped in borate buffer pH 8.3-9.0, and organic Qdot nanocrystals are stored and shipped in decane.

What is the temperature range in which Qdot nanocrystals are stable?

When stored at 4 degrees C, Qdot nanocrystals are stable for approximately 6 months. Qdot nanocrystals should never be frozen due to the possibility of aggregation. The temperature stability of Qdot nanocrystals is summarized below. Please note that fluorescence is not temperature dependent.

<0 degrees C: NEVER freeze Qdot nanocrystals - polymer induces aggregation at freezing temperatures.
>4 degrees C: Core/Shell/Polymer stable at 4 degrees C for ~ 6 months. May be filter sterilized using uncharged filters.
<60 degrees C: Core/Shell/Polymer stable at 60 degrees C (as in in situ hybridization).
<65 degrees C: Core/Shell/Polymer stable at 65 degrees C for only ~1 hour, beyond 1 hour, emission drops off.
<100 degrees C: Core/Shell/Polymer stable up to 100 degrees C brief exposure. OK for 5 minutes at 100 degrees C.
<360 degrees C: Only Core/Shell stable up to 360 degrees C.

What is the pH range in which Qdot nanocrystals are stable?

Qdot nanocrystals are most stable at pH 6-9, and marginal stability of Qdot nanocrystals is shown down to a pH 5. Qdot nanocrystals should not be used at pH > 9 due to the possibility of self-aggregation and clumping, and Qdot nanocrystals should not be used pH less than 4 as the polymer and exposed core/shell will begin to dissociate. For more information on Qdot nanocrystals and recommended pH ranges, see pH Ranges for Qdot Nanocrystals (https://www.thermofisher.com/us/en/home/brands/molecular-probes/key-molecular-probes-products/qdot/qdot-reg--nanocrystal0.html)

Can I use Qdot nanocrystals in FRET applications?

You can use Qdot nanocrystals with FRET applications in two scenarios:

- Qdot nanocrystals as donors with fluorescent dyes as acceptors
- Lanthanide (terbium, europium, etc.) as donors with Qdot nanocrystals as acceptors
Note: You cannot perform FRET experiments using Qdot nanocrystals as both donor and acceptor.

Can I make custom conjugates with Qdot nanocrystals?

We offer amino (PEG), carboxyl, and streptavidin-functionalized Qdot Innovator's Tool Kit ITK Nanocrystals for the preparation of custom conjugates of proteins or other biomolecules. Amino (PEG)-derivitized forms can be coupled to isothiocyanates and succinimidyl esters or with native carboxylic acids using water-soluble carbodiimides. Carboxyl-derivitized forms can be coupled to amine groups of proteins and modified oligonucleotides. Streptavidin-derivitized forms can be bound with biotinylated conjugates to form stable labeled complexes.

In which applications can I use Qdot nanocrystals?

Qdot nanocrystals and bioconjugates are ideal for experiments requiring long-term photostability or single-excitation, multicolor analysis. Some example applications include:

- Flow cytometry
- Cell and tissue staining
- Cell tracking
- WesternDot western blotting
- In vivo imaging

What advantages do Qdot nanocrystals offer over traditional fluorescent dyes?

Qdot nanocrystals offer many advantages over traditional fluorescent dyes:

- Qdot nanocrystals have a broad excitation range, and they can be excited by any wavelength below their emission peak. The lower the excitation wavelength, the higher the extinction coefficient and Qdot nanocrystal brightness.
- Multicolor detection using Qdot nanocrystals can be done using a single excitation wavelength.
- Qdot nanocrystals exhibit a large Stokes shift.
- Qdot nanocrystals have a narrow emission band.
- Qdot nanocrystals have excellent photostability compared to traditional fluorescent dyes.

What is the basic structure of a Qdot nanocrystal?

A Qdot nanocrystal is comprises four basic layers. Listed from inner core to outer shell, these are:

1) Core nanocrystal (CdSe or CdSeTe): Determines the color of the Qdot nanocrystal
2) Inorganic shell (ZnS): Improves brightness and stability of the Qdot nanocrystal
3) Organic/polymer coating: Provides water solubility and/or functional groups for conjugation
4) Biomolecule: Covalently attached to the polymer shell and can include antibodies, streptavidin, receptor ligands, or oligonucleotides.

Safety and Handling

WARNING: Reproductive Harm - www.P65Warnings.ca.gov