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  • : ABC124
  • : 100 μg
  • : Please refer to the Certificate of Analysis for the lot-specific concentration.

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Western Blotting Analysis:
Representative lot data.
Non-serum starved (Lane 1) and serum starved (Lane 2) MCF7 cell lysates were probed wi...

Anti-phospho-ULK1 (Ser555)

Species Reactivity Key Applications Host Format Antibody Type
H, M, R, B, Xn WB, PIA Rabbit Affinity Purified Polyclonal Antibody
Anti-phospho-ULK1 (Ser555) Antibody
Promotional Text:
This antibody recognizes ULK1 phosphorylated at Ser555.
Molecular Weight:
~120 kDa observed. Uniprot describes a molecular weight at 112 kDa. This protein has been observed at greater than ~125 kDa due to multiple phosphorylation-dephosphorylation processes. (Ganley, I. G., et al. (2009). J Biol Chem. 284(18):12297-12305.)
Phosphorylated Ser555
KLH-conjugated linear peptide corresponding to human ULK1 phosphorylated at Ser555.
Background Information:
ULK1 or autophagy-related protein 1 homolog (ATG1) is a serine/threonine protein kinase. It is a ubiquitously expressed protein that is highly abundant in the brain, skeletal muscle, and heart. It is involved in the signaling pathway of mTOR receptors leading to the regulation of autophagy in nutrient-deprived cells. mTOR may interact with ULK1 as a complex of ULK1/FIP200/Atg13. ULK1 may play an important role in neuronal development: Elimination of ULK1's enzymatic activity by targeted disruption of its kinase domain has blocked the outgrowth of neurons in the developing mouse brain, possibly by blocking the ULK1-mediated trafficking of neurotrophins.
Species Reactivity:
  • Human
  • Mouse
  • Rat
  • Bovine
  • Xenopus
Species Reactivity Note:
Demonstrated to react with Human. Predicted to react with Mouse, Rat, Bovine, and Xenopus based on 100% sequence homology.
Application Notes:
Peptide Inhibition Analysis: A representative lot of this antibody blocked ULK1 in PIA involving peptide 3123-C vs. peptide 3123 on serum starved MCF7 cell lysates.
Non-serum starved and serum starved MCF7 cell lysates
Quality Assurance:
Evaluated by Western Blot in non-serum starved and serum starved MCF7 cell lysates.

Western Blot Analysis: 0.2 µg/mL of this antibody detected phospho-ULK1 (Ser555) in 10 µg of non-serum starved and serum starved MCF7 cell lysates.
Purification Method:
Affinity purified
Purified rabbit polyclonal in buffer containing 0.1 M Tris-Glycine (pH 7.4), 150 mM NaCl with 0.05% sodium azide.
Storage Conditions:
Stable for 1 year at 2-8°C from date of receipt.
UniProt Number:
Entrez Gene Number:
Gene Symbol:
Alternate Names:
  • Serine/threonine-protein kinase ULK1
  • Autophagy-related protein 1 homolog
  • ATG1
  • hATG1
  • Unc-51-like kinase 1
Usage Statement:
Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.
Key Applications:
  • Western Blotting
  • Peptide Inhibition Assay
UniProt Summary:
FUNCTION: Serine/threonine-protein kinase involved in autophagy in response to starvation. Acts upstream of phosphatidylinositol 3-kinase PIK3C3 to regulate the formation of autophagophores, the precursors of autophagosomes. Part of regulatory feedback loops in autophagy: acts both as a downstream effector and negative regulator of mammalian target of rapamycin complex 1 (mTORC1) via interaction with RPTOR. Activated via phosphorylation by AMPK and also acts as a regulator of AMPK by mediating phosphorylation of AMPK subunits PRKAA1, PRKAB2 and PRKAG1, leading to negatively regulate AMPK activity. May phosphorylate ATG13/KIAA0652 and RPTOR; however such data need additional evidences. Plays a role early in neuronal differentiation and is required for granule cell axon formation.

CATALYTIC ACTIVITY: ATP + a protein = ADP + a phosphoprotein.

SUBUNIT STRUCTURE: ATP + a protein = ADP + a phosphoprotein.

SUBCELLULAR LOCATION: Cytoplasm > cytosol. Preautophagosomal structure. Note: Under starvation conditions, is localized to puncate structures primarily representing the isolation membrane that sequesters a portion of the cytoplasm resulting in the formation of an autophagosome.

TISSUE SPECIFICITY: Ubiquitously expressed. Detected in the following adult tissues: skeletal muscle, heart, pancreas, brain, placenta, liver, kidney, and lung.

POST-TRANSLATIONAL MODIFICATION: Autophosphorylated. Phosphorylated under nutrient-rich conditions; dephosphorylated during starvation or following treatment with rapamycin. Under nutrient sufficiency, phosphorylated by MTOR/mTOR, disrupting the interaction with AMPK and preventing activation of ULK1. In response to nutrient limitation, phosphorylated and activated by AMPK, leading to activate autophagy.

SEQUENCE SIMILARITIES: Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. APG1/unc-51/ULK1 subfamily. Contains 1 protein kinase domain.

SEQUENCE CAUTION: The sequence BAA34442.2 differs from that shown. Reason: Erroneous initiation. Translation N-terminally shortened.
Product Name:
Anti-phospho-ULK1 (Ser555)
Please refer to the Certificate of Analysis for the lot-specific concentration.
Antibody Type:
Polyclonal Antibody
100 μg
Affinity Purified
This Anti-phospho-ULK1 (Ser555) Antibody is validated for use in Western Blotting, Peptide Inhibition Assay for the detection of phospho-ULK1 (Ser555).

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