Revision 7
Cell Signaling Technology

Orders: 877-616-CELL (2355) [email protected]

Support: 877-678-TECH (8324)

Web: [email protected] cellsignal.com

3 Trask LaneDanversMassachusetts01923USA
For Research Use Only. Not for Use in Diagnostic Procedures.
Applications:

IF-IC, FC-FP

REACTIVITY:

H M R

SENSITIVITY:

Endogenous

MW (kDa):

Source/Isotype:

Mouse IgG2b

UniProt ID:

#Q9GZQ8

Entrez-Gene Id:

81631

Product Information

Product Usage Information

Application Dilution
Immunofluorescence (Immunocytochemistry) 1:50
Flow Cytometry (Fixed/Permeabilized) 1:50

Storage

Supplied in PBS (pH 7.2), less than 0.1% sodium azide and 2 mg/ml BSA. Store at 4°C. Do not aliquot the antibody. Protect from light. Do not freeze.

Specificity / Sensitivity

LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate) recognizes endogenous levels of total LC3B protein. This antibody detects both type I and type II forms of LC3B. Cross-reactivity was not detected with other family members.

Species Reactivity:

Human, Mouse, Rat

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues near the amino terminus of human LC3B protein.

Product Description

This Cell Signaling Technology antibody is conjugated to Alexa Fluor® 647 fluorescent dye and tested in-house for direct immunofluorescent analysis in human cells. This antibody is expected to exhibit the same species cross-reactivity as the unconjugated LC3B (E5Q2K) Mouse mAb #83506.

Background

Autophagy is a catabolic process for the autophagosomic-lysosomal degradation of bulk cytoplasmic contents (1,2). Autophagy is generally activated by conditions of nutrient deprivation, but it has also been associated with a number of physiological processes including development, differentiation, neurodegenerative diseases, infection, and cancer (3). Autophagy marker Light Chain 3 (LC3) was originally identified as a subunit of microtubule-associated proteins 1A and 1B (termed MAP1LC3) (4) and subsequently found to contain similarity to the yeast protein Apg8/Aut7/Cvt5 critical for autophagy (5). Three human LC3 isoforms (LC3A, LC3B, and LC3C) undergo posttranslational modifications during autophagy (6-9). Cleavage of LC3 at the carboxy terminus immediately following synthesis yields the cytosolic LC3-I form. During autophagy, LC3-I is converted to LC3-II through lipidation by a ubiquitin-like system involving Atg7 and Atg3 that allows for LC3 to become associated with autophagic vesicles (6-10). The presence of LC3 in autophagosomes and the conversion of LC3 to the lower migrating form, LC3-II, have been used as indicators of autophagy (11).

  1. Reggiori, F. and Klionsky, D.J. (2002) Eukaryot. Cell 1, 11-21.
  2. Codogno, P. and Meijer, A.J. (2005) Cell Death Differ. 12 Suppl 2, 1509-18.
  3. Levine, B. and Yuan, J. (2005) J. Clin. Invest. 115, 2679-88.
  4. Mann, S.S. and Hammarback, J.A. (1994) J. Biol. Chem. 269, 11492-97.
  5. Lang, T. et al. (1998) EMBO J. 17, 3597-607.
  6. Kabeya, Y. et al. (2000) EMBO J. 19, 5720-28.
  7. He, H. et al. (2003) J. Biol. Chem. 278, 29278-87.
  8. Tanida, I. et al. (2004) J. Biol. Chem. 279, 47704-10.
  9. Wu, J. et al. (2006) Biochem. Biophys. Res. Commun. 339, 437-42.
  10. Ichimura, Y. et al. (2000) Nature 408, 488-92.
  11. Kabeya, Y. et al. (2004) J. Cell Sci. 117, 2805-12.

Species Reactivity

Species reactivity is determined by testing in at least one approved application (e.g., western blot).

Applications Key

IF-IC: Immunofluorescence (Immunocytochemistry) FC-FP: Flow Cytometry (Fixed/Permeabilized)

Cross-Reactivity Key

H: human M: mouse R: rat Hm: hamster Mk: monkey Vir: virus Mi: mink C: chicken Dm: D. melanogaster X: Xenopus Z: zebrafish B: bovine Dg: dog Pg: pig Sc: S. cerevisiae Ce: C. elegans Hr: horse GP: Guinea Pig Rab: rabbit All: all species expected

Trademarks and Patents

Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.
This product is provided under an intellectual property license from Life Technologies Corporation. The transfer of this product is conditioned on the buyer using the purchased product solely in research conducted by the buyer, excluding contract research or any fee for service research, and the buyer must not (1) use this product or its components for (a) diagnostic, therapeutic or prophylactic purposes; (b) testing, analysis or screening services, or information in return for compensation on a per-test basis; or (c) manufacturing or quality assurance or quality control, and/or (2) sell or transfer this product or its components for resale, whether or not resold for use in research. For information on purchasing a license to this product for purposes other than as described above, contact Life Technologies Corporation, 5791 Van Allen Way, Carlsbad, CA 92008 USA or [email protected].
All other trademarks are the property of their respective owners. Visit cellsignal.com/trademarks for more information.

Limited Uses

Except as otherwise expressly agreed in a writing signed by a legally authorized representative of CST, the following terms apply to Products provided by CST, its affiliates or its distributors. Any Customer's terms and conditions that are in addition to, or different from, those contained herein, unless separately accepted in writing by a legally authorized representative of CST, are rejected and are of no force or effect.

Products are labeled with For Research Use Only or a similar labeling statement and have not been approved, cleared, or licensed by the FDA or other regulatory foreign or domestic entity, for any purpose. Customer shall not use any Product for any diagnostic or therapeutic purpose, or otherwise in any manner that conflicts with its labeling statement. Products sold or licensed by CST are provided for Customer as the end-user and solely for research and development uses. Any use of Product for diagnostic, prophylactic or therapeutic purposes, or any purchase of Product for resale (alone or as a component) or other commercial purpose, requires a separate license from CST. Customer shall (a) not sell, license, loan, donate or otherwise transfer or make available any Product to any third party, whether alone or in combination with other materials, or use the Products to manufacture any commercial products, (b) not copy, modify, reverse engineer, decompile, disassemble or otherwise attempt to discover the underlying structure or technology of the Products, or use the Products for the purpose of developing any products or services that would compete with CST products or services, (c) not alter or remove from the Products any trademarks, trade names, logos, patent or copyright notices or markings, (d) use the Products solely in accordance with CST Product Terms of Sale and any applicable documentation, and (e) comply with any license, terms of service or similar agreement with respect to any third party products or services used by Customer in connection with the Products.

Revision 7
#18577

LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate)

Immunofluorescence Image 1: LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate) Expand Image
Projected confocal z-stack of HeLa cells, untreated (left), nutrient-starved with EBSS (2 hr; middle), or treated with Chloroquine #14774 (50 μM, 24 hr; right), using LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate) (red). Samples were mounted in ProLong® Gold Antifade Reagent with DAPI #8961 (blue).
Immunofluorescence Image 2: LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate) Expand Image
Confocal immunofluorescent analysis of HCT 116 cells, either untreated (left) or treated with Chloroquine #14774 (50 µM, overnight) (center), or LC3B HCT 116 knockout cells treated with Chloroquine #14774 (50 µM, overnight) (right) using LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate) (red). Actin filaments were labeled with β-Actin (13E5) Rabbit mAb #4970 (green) and nuclei were labeled with DAPI #4083 (blue).
Flow Cytometry Image 1: LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate) Expand Image
Flow cytometric analysis of HCT-116 cells, wild-type (green, positive) or LC3B knockout (blue, negative), using LC3B (E5Q2K) Mouse mAb (Alexa Fluor® 647 Conjugate) (solid lines) or a concentration-matched Mouse (E7Q5L) mAb IgG2b Isotype Control (Alexa Fluor® 647 Conjugate) #38657 (dashed lines).