Recombinant Human MAP1LC3B Protein

Beta LifeScience SKU/CAT #: BL-1886NP
BL-1886NP: Greater than 95% as determined by reducing SDS-PAGE. (QC verified)
BL-1886NP: Greater than 95% as determined by reducing SDS-PAGE. (QC verified)

Recombinant Human MAP1LC3B Protein

Beta LifeScience SKU/CAT #: BL-1886NP
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Product Overview

Description Recombinant Human Microtubule-associated Proteins 1A/1B Light Chain 3B is produced by our E.coli expression system and the target gene encoding Met1-Val125 is expressed.
Accession Q9GZQ8
Synonym Microtubule-associated proteins 1A/1B light chain 3B; Autophagy-related protein LC3 B; Autophagy-related ubiquitin-like modifier LC3 B; MAP1 light chain 3-like protein 2; MAP1A/MAP1B light chain 3 B; MAP1A/MAP1B LC3 B; Microtubule-associated protein 1 light chain 3 beta; MAP1LC3B; MAP1ALC3
Gene Background Microtubule-associated proteins 1A/1B light chain 3B (MAP1LC3B) is a member of the highly conserved ATG8 protein family. ATG8 proteins are present in all known eukaryotic organisms. MAP1LC3B is one of the four genes in the MAP1LC3 subfamily (others include MAP1LC3A, MAP1LC3C, and MAP1LC3B2). It is moat abundantly expressed in heart, brain, skeletal muscle and testis. LMAP1LC3B is a subunit of neuronal microtubule and functions in formation of autophagosomal vacuoles (autophagosomes). It associated MAP1A and MAP1B proteins, which are involved in microtubule assembly and important for neurogenesis. MAP1LC3B also plays a role in autophagy, a process that involves the bulk degradation of cytoplasmic component.
Molecular Mass 14.8 KDa
Apmol Mass 15 KDa, reducing conditions
Formulation Lyophilized from a 0.2 μm filtered solution of 20mM Tris-HCl, 150mM NaCl, 2mM DTT, pH 8.0.
Endotoxin Less than 0.1 ng/µg (1 EU/µg) as determined by LAL test.
Purity Greater than 95% as determined by reducing SDS-PAGE. (QC verified)
Biological Activity Not tested
Reconstitution Always centrifuge tubes before opening. Do not mix by vortex or pipetting. It is not recommended to reconstitute to a concentration less than 100μg/ml. Dissolve the lyophilized protein in distilled water. Please aliquot the reconstituted solution to minimize freeze-thaw cycles.
Storage Lyophilized protein should be stored at ≤ -20°C, stable for one year after receipt. Reconstituted protein solution can be stored at 2-8°C for 2-7 days. Aliquots of reconstituted samples are stable at ≤ -20°C for 3 months.
Shipping The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature listed below.
Usage For Research Use Only

Target Details

Target Function Ubiquitin-like modifier involved in formation of autophagosomal vacuoles (autophagosomes). Plays a role in mitophagy which contributes to regulate mitochondrial quantity and quality by eliminating the mitochondria to a basal level to fulfill cellular energy requirements and preventing excess ROS production. In response to cellular stress and upon mitochondria fission, binds C-18 ceramides and anchors autophagolysosomes to outer mitochondrial membranes to eliminate damaged mitochondria. While LC3s are involved in elongation of the phagophore membrane, the GABARAP/GATE-16 subfamily is essential for a later stage in autophagosome maturation. Promotes primary ciliogenesis by removing OFD1 from centriolar satellites via the autophagic pathway. Through its interaction with the reticulophagy receptor TEX264, participates in the remodeling of subdomains of the endoplasmic reticulum into autophagosomes upon nutrient stress, which then fuse with lysosomes for endoplasmic reticulum turnover.
Subcellular Location Cytoplasm, cytoskeleton. Endomembrane system; Lipid-anchor. Cytoplasmic vesicle, autophagosome membrane; Lipid-anchor.
Protein Families ATG8 family
Database References
Tissue Specificity Most abundant in heart, brain, skeletal muscle and testis. Little expression observed in liver.

Gene Functions References

  1. Study demonstrated that the expression of LC3B was upregulated in 4nitroquinoline1oxideinduced oral carcinogenesis, accompanied with myeloidderived suppressor cells and regulatory T cells accumulation. PMID: 30272335
  2. High p62 cytoplasmic expression on its own (p PMID: 29897944
  3. Here the authors present evidence for phosphorylation-driven regulation of the Nix:LC3B interaction. Isothermal titration calorimetry and NMR indicate a ~100 fold enhanced affinity of the serine 34/35-phosphorylated Nix LC3-interacting region (LIR) to LC3B and formation of a very rigid complex compared to the non-phosphorylated sequence. PMID: 28442745
  4. The results suggest that autophagy-associated proteins LC3A, LC3B, and Beclin-1 might be potential biomarkers for subclassification, differentiation, and local metastasis in primary lung tumor. PMID: 29545906
  5. Simultaneous high expression of LC3B (and ULK1) had a poorer survival rate in hepatocellular carcinoma patients. PMID: 29091866
  6. LC3B and ESRRA might be a useful prognostic factor in patients with Muscle-invasive bladder cancer. The co-expression of LC3B and ESRRA might be a prognostic and therapeutic target for patients with bladder cancer. PMID: 29599373
  7. High levels of LC3B is associated with non-small cell lung cancer. PMID: 28558758
  8. LC3b was significantly overexpressed in malignant compared to benign prostate tissue. However, positive LC3b immunoreactivity in PCa, as a marker of increased autophagy, was independently associated with a reduced disease-specific mortality. PMID: 28423666
  9. Our results suggested that activated Akt/mTOR-autophagy may have a role in the local T cell-mediated immunoregulatory mechanism of oral lichen planus (OLP). LC3B might be a valuable marker to monitor the disease severity of OLP. PMID: 28482233
  10. presence of LC3B puncta and HMGB1 expression in malignant cells correlate with the immune infiltrate in breast cancer PMID: 26979828
  11. the L341V mutation limits the critical step of SQSTM1 recruitment to the phagophore PMID: 27158844
  12. LC3B and p62 have roles in autophagy in esophageal adenocarcinoma PMID: 27250034
  13. Data indicate that tubule-associated protein 1 light chain 3 beta (LC3B) can be potentially useful for identifying autophagosomes and differentiating their developmental stages. PMID: 28506764
  14. analysis of the RavZ and LC3 complex reveals the mechanism for deconjugation of LC3 on the phagophore membrane PMID: 27791457
  15. SQSTM1 is ubiquitinated by NEDD4 while LC3 functions as an activator of NEDD4 ligase activity. PMID: 28085563
  16. Cardiolipin interaction with various Atg8 human orthologs, namely LC3B, GABARAPL2 and GABARAP, was investigated. PMID: 27764541
  17. Insights into links between autophagy and the ubiquitin system showed that LC3B-binding can steer intrinsic NEDD4 E3 ligase activity. PMID: 28470758
  18. Determined is the three-dimensional crystal structures of LC3B in complex with three different LIR motifs of RavZ from Legionella pneumophila, an intracellular pathogen that can manipulate the host autophagy system. PMID: 28668392
  19. We found that 25-epi Ritterostatin GN1N induced cell death in melanoma cells at nanomolar concentrations, and this cell death was characterized by inhibition of GRP78 expression, increased expression of the ER stress marker CHOP, loss of mitochondrial membrane potential, and lipidation of the autophagy marker protein LC3B. PMID: 28393217
  20. Double IF showed the co-localization of AQP5 and LC3B on BafA1-treated heated cells. In conclusion, we demonstrated that heat shock decreased AQP5 on cellular membranes and in the cytoplasm by activating autophagic degradation, and heat shock and AQP5 knockdown exerted similar anticancer effects, suggesting that heat shock exerts anticancer effects via the autophagic degradation of AQP5. PMID: 28358429
  21. structural and biochemical results reveal a working model for the specific recognition of FUNDC1 by LC3B and imply that the reversible phosphorylation modification of mitophagy receptors may be a switch for selective mitophagy. PMID: 27757847
  22. Low expression of MAP1LC3B is associated with lymph node metastasis in gastric cancer. PMID: 27655288
  23. Poly C binding protein 1 represses autophagy through downregulation of LC3B to promote tumor cell apoptosis in starvation PMID: 26880484
  24. BAG3 maintains the basal amount of LC3B protein by controlling the translation of its mRNA in HeLa and HEK293 cells. PMID: 26654586
  25. Among the 101 patients, the frequency of high expression of beclin-1 was 31.7% (32/101) and that of LC3b was 46.5% (47/101). A pathologic complete response was inversely associated with LC3b expression (P = 0.003) and alterations in the expression of autophagy-related proteins PMID: 26965179
  26. Collectively, our findings indicate that MIR494 reduces cell survival in 769-P renal cancer cells which is accompanied by increased lipid droplet formation (which occurs in a LC3B-dependent manner) and mitochondrial changes. PMID: 26794413
  27. Data show CGK733 induced microtubule associated protein LC3B formation upstream of AMP-activated protein kinase and protein kinase RNA-like endoplasmic reticulum kinase/CCAAT-enhancer-binding protein homologous protein pathways and p21 Cip1 expression. PMID: 26486079
  28. the combined positivity for LC3B(+) puncta and nuclear HMGB1 is a positive predictor for longer BC survival PMID: 26506894
  29. In microsatellite stable carcinomas, the level of LC3B-II expression was higher than that in the microsatellite unstable carcinomas. PMID: 26502823
  30. Loss of HPS1 protein results in impaired autophagy that is restored by exogenous LC3B and that defective autophagy might therefore play a critical role in the development and progression of Hermansky-Pudlak syndrome. PMID: 26719147
  31. mRNA levels of MAP1LC3B, an autophagic marker, showed a 5-fold decrease in symptomatic samples. PMID: 25503069
  32. LC3B may promote the migration and invasion of EOC cells by affecting the cytoskeleton via the RhoA pathway. PMID: 25607473
  33. This study unveils that HIV-1 Vif inhibits autophagy via interaction with LC3B independently of its action on APOBEC3G and, therefore, suggest a new function of this viral protein in restricting innate antiviral mechanisms. PMID: 25490467
  34. Data show that interaction between promyelocytic leukemia protein (PML) and microtubule-associated protein light chain 3 (LC3) contributes to cell growth inhibition function of PML. PMID: 25419843
  35. investigated the expression of autophagy-related markers microtubule-associated protein IA/IB light chain 3 (LC3) and p62/sequestosome-1 (p62), in cutaneous squamous cell carcinoma specimens and assessed their correlation to clinicopathological factors PMID: 24690104
  36. When not bound to autophagosomes, LC3B associates with a multicomponent complex with an effective size of ~500 kDa in the cytoplasm. PMID: 24646892
  37. positive fibroblastic LC3B correlates with lower invasion, and low expression of fibroblastic Cav-1 is a novel predictor of poor GC prognosis. PMID: 23203033
  38. high expression of LC3B, correlated with vascular invasion and lymph node metastasis, might be a novel prognostic biomarker and would be a potential therapy target for HCC. PMID: 25256671
  39. High intensity of LC3B staining was predictive of poor prognosis. PMID: 24900981
  40. elevating the levels of TSC1 (tuberous sclerosis complex) and TSC2 and inactivating MTOR and RPS6KB/p70S6K, causing cleaved MAP1LC3B levels to increase PMID: 24113030
  41. High cytoplasmic p62 expression accompanied with either a low or high LC3B expression. PMID: 24983366
  42. Data indicate that high cytoplasmic microtubule-associated protein 1 light chain LC3A, LC3B, Beclin 1 and p62/SQSTM1 expressions were independently linked with the Gleason score. PMID: 23787295
  43. LC3B can be used as a prognostic marker in patients with non-pCR after NCT for breast cancer, which highlights the importance of autophagy in the biologic behavior of chemoresistant cancer cells PMID: 24141623
  44. knockdown of LC3B but not GABARAPs resulted in significant accumulation of p62/Sqstm1, one of the selective substrates for autophagy PMID: 24582747
  45. The results of this study identify a new physiological role for the PSF-LC3B axis as a potential endogenous modulator of colon cancer treatment. PMID: 24288667
  46. these data indicated that LC3B-II deacetylation, which was partly mediated by HDAC6, is involved in autophagic degradation during serum starvation. PMID: 24220335
  47. Beclin-1 and LC3-II are downregulated in hypopharyngeal squamous cell carcinoma patients, and their aberrant expression correlates with poor prognosis. PMID: 23935917
  48. NMR and crystal structures of the autophagy modifier LC3B in complex with the LC3 interaction region of optineurin. PMID: 23805866
  49. These preliminary results demonstrated that high LC3B expression was associated with lymph node and distant metastasis in triple-negative breast cancer PMID: 23371253
  50. Data show that VPRBP (viral protein R-binding protein)-LC3B (light-chain 3B)/p62(SQSTM1) were in the same protein complex. PMID: 22963397


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Proteins are sensitive to heat, and freeze-drying can preserve the activity of the majority of proteins. It improves protein stability, extends storage time, and reduces shipping costs. However, freeze-drying can also lead to the loss of the active portion of the protein and cause aggregation and denaturation issues. Nonetheless, these adverse effects can be minimized by incorporating protective agents such as stabilizers, additives, and excipients, and by carefully controlling various lyophilization conditions.

Commonly used protectant include saccharides, polyols, polymers, surfactants, some proteins and amino acids etc. We usually add 8% (mass ratio by volume) of trehalose and mannitol as lyoprotectant. Trehalose can significantly prevent the alter of the protein secondary structure, the extension and aggregation of proteins during freeze-drying process; mannitol is also a universal applied protectant and fillers, which can reduce the aggregation of certain proteins after lyophilization.

Our protein products do not contain carrier protein or other additives (such as bovine serum albumin (BSA), human serum albumin (HSA) and sucrose, etc., and when lyophilized with the solution with the lowest salt content, they often cannot form A white grid structure, but a small amount of protein is deposited in the tube during the freeze-drying process, forming a thin or invisible transparent protein layer.

Reminder: Before opening the tube cap, we recommend that you quickly centrifuge for 20-30 seconds in a small centrifuge, so that the protein attached to the tube cap or the tube wall can be aggregated at the bottom of the tube. Our quality control procedures ensure that each tube contains the correct amount of protein, and although sometimes you can't see the protein powder, the amount of protein in the tube is still very precise.

To learn more about how to properly dissolve the lyophilized recombinant protein, please visit Lyophilization FAQs.

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