Hemocyanin from Megathura crenulata (keyhole limpet)

Keyhole limpet hemocyanin, KLH
CAS Number:
MDL number:

Quality Level

biological source

Megathura crenulata




vial of KLH (KLH is present by weight at approximately 1 part KLH to 5 parts total solid.)


ELISA: suitable


H2O: soluble

storage temp.


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General description

Gastropod hemocyanins are massive glycoproteins (4 to 8 MDa) designed by an intricate arrangement of 10 subunits that are self-assembled into hollow cylinders 35 nm in diameter.
Hemocyanin is a high molecular weight copper containing glycoprotein. It reversibly binds oxygen and forms the extra-cellular respiratory protein of mollusks. Keyhole limpet hemocyanin (KLH) is filtered from the hemolymph of Megathura crenulata, also called the giant keyhole limpet. It is native to the southern California coast and Mexico.


Keyhole limpet hemocyanin (KLH) is a strong and well known immune-stimulant in both experimental animals and humans. It has been used as a hapten carrier protein to enhance antigen-specific T cell priming and is known to stimulate a CD4+ T-cell response. Hemocyanins stimulate Th1 reactions without known side effects, which make them ideal for long-term continuous treatment of cancer.

Physical form

Lyophilized with stabilizing buffer


Reconstitute with deionized water to a KLH concentration of 10 mg/mL, to yield an opalescent solution in 31 mM sodium phosphate buffer, pH 7.4, containing 0.46 M NaCl, 2% PVP and 41 mM sucrose.
Reconstituted protein solution may be stored up to 2 months at −20 °C.

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

J T Brisbin et al.
Poultry science, 87(10), 1995-1999 (2008-09-24)
Subtherapeutic and prophylactic doses of virginiamycin are capable of altering the intestinal microbiota as well as increasing several growth parameters in chickens. In spite of the fact that the microbiota plays a role in shaping the host's immune system, little...
Chloe C Josefson et al.
Integrative and comparative biology, 60(3), 732-741 (2020-08-21)
One of the key foci of ecoimmunology is understanding the physiological interactions between reproduction and immune defense. To assess an immune challenge, investigators typically measure an immune response at a predetermined time point that was selected to represent a peak...
Robert J Huber et al.
Histochemistry and cell biology, 136(2), 177-189 (2011-07-19)
The Dictyostelium discoideum homolog of mammalian cyclin dependent kinase 5 (Cdk5) has previously been shown to be required for optimal growth and differentiation in this model organism, however, the subcellular localization of the protein has not previously been studied. In...
Xiujuan Zhou et al.
Fish & shellfish immunology, 93, 641-651 (2019-07-26)
Interleukin-2 receptor subunit beta of flounder (Paralichthys olivace, fIL-2Rβ) was annotated on the NCBI, its gene was cloned and characterized functionally in this study. And then the amino acids sequences and tertiary structure of fIL-2Rβ were analyzed, respectively. RT-PCR and...
Traumatic aneurysm of the internal carotid artery with fracture dislocation at C 5: case report.
H Wada et al.
Neurosurgical review, 12 Suppl 1, 600-601 (1989-01-01)

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