(Ala11, D-Leu15)-Orexin B human


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  • Application Data


Orexin B is a highly potent and selective OX2 receptor agonist.

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Application Data

Catalogue number crb1000496
Molecular Weight 898.5
Sequence (one letter code)


Sequence (three letter code)


Purity >95%
Storage -20°C

Asahi et al., (2003). Development of an orexin-2 receptor selective agonist, [Ala(11), D-Leu(15)]orexin-B. Bioorg. Med. Chem. Lett. 13(1) 111. PMID: 12467628


Shahid et al., (2012). Orexin A in rat rostral ventrolateral medulla is pressor, sympatho-excitatory, increases barosensitivity and attenuates the somato-sympathetic reflex. Br. J. Pharmacol. 165(7) 2292. PMID: 21951179


Wang et al., (2018). The Orexin/Receptor System: Molecular Mechanism and Therapeutic Potential for Neurological Diseases. Front. Mol. Neurosci. 11. PMID: 30002617

Manufactured in: United Kingdom
Data Sheet Material Safety Data Sheet (MSDS)

Orexin B is one of two closely related peptides; the orexins (also known as hypocretins). These small neuropeptides are secreted from orexin-containing neurons, located mainly in the lateral hypothalamus (LH). Orexins function via the binding and activation of two G-protein–coupled receptors (GPCRs); orexin receptor type 1 (OX1) and 2 (OX2).

[Ala(11), D-Leu(15)]orexin-B is a highly potent and selectiveOX2 receptor agonist which can discriminate between the OX1 and OX2 receptors, with a 400-fold selectivity for the OX2 over OX1. [Ala(11), D-Leu(15)]orexin-B is therefore a beneficial tool for addressing the functional roles of OX2.

The L-leucine residue at position 11 of orexin B is important for selectivity to OX2 over OX1. L-Alanine substitution at position 11 and D-leucine substitution at positions 15 maintain the potency of orexin-B to OX2, while significantly reducing the potency for OX1.

Orexins play several vital roles in a range of physiological activities, including: circadian rhythm; feeding behaviour; energy balance; glucose metabolism; neuroendocrine functions; stress-adaptive responses and reward and addiction. Orexins have also been linked to the pathological processes of neurological diseases such as: narcolepsy; depression; ischemic stroke; drug addiction and Alzheimer’s disease.

(Ala11, D-Leu15)-Orexin B human

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