Catalog No. size PriceQuantity
M6698-2 2mg solid $110
M6698-10 10mg solid $431


BEC, also known as S-(2-boronoethyl)-L-cysteine, is an a slow-binding and competitive Arginase II inhibitor with Ki of 0.31 μM (ph 7.5). BEC significantly enhances NO-dependent relaxation of human penile corpus canvernosum smooth muscle in vitro at concentrations between 0.1-1.0 mM. S-(2-boronoethyl)-L-cysteine binds to arginase as a transition state analogue and enhances smooth muscle relaxation in human penile corpus cavernosum.

Product information

CAS Number: 222638-67-7

Molecular Weight: 229.49

Formula: C5H13BClNO4S




Chemical Name:    S-(2-boronoethyl)-L-cysteine hydrochloride

Smiles: Cl.N[C@@H](CSCCB(O)O)C(O)=O


InChi: InChI=1S/C5H12BNO4S.ClH/c7-4(5(8)9)3-12-2-1-6(10)11;/h4,10-11H,1-3,7H2,(H,8,9);1H/t4-;/m0./s1

Technical Data

Appearance: Solid Power.

Purity: ≥98% (or refer to the Certificate of Analysis)

Solubility: Soluble in DMSO

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical or refer to Certificate of Analysis

Storage Condition: Dry, dark and -20 oC for 1 year or refer to the Certificate of Analysis.

Shelf Life: ≥12 months if stored properly.

Stock Solution Storage: 0 - 4 oC for 1 month or refer to the Certificate of Analysis.

Drug Formulation: To be determined.

HS Tariff Code: 382200

How to use

In Vitro:

The X-ray crystal structure of the arginase-BEC complex has been determined at 2.3 A resolution from crystals perfectly twinned by hemihedry. The structure of the complex reveals that the boronic acid moiety undergoes nucleophilic attack by metal-bridging hydroxide ion to yield a tetrahedral boronate anion that bridges the binuclear manganese cluster, thereby mimicking the tetrahedral intermediate (and its flanking transition states) in the arginine hydrolysis reaction.

In Vivo:

Administration of the arginase inhibitor BEC decreases arginase activity and causes alterations in NO homeostasis, which are reflected by increases in S-nitrosylated and nitrated proteins in the lungs from inflamed mice. BEC enhances perivascular and peribronchiolar lung inflammation, mucus metaplasia, NF-κB DNA binding, and mRNA expression of the NF-κB-driven chemokine genes CCL20 and KC, and leads to further increases in airways hyperresponsiveness.


  1. Kim NN, Cox JD, Baggio RF, Emig FA, Mistry SK, Harper SL, Speicher DW, Morris SM Jr, Ash DE, Traish A, Christianson DW. Probing erectile function: S-(2-boronoethyl)-L-cysteine binds to arginase as a transition state analogue and enhances smooth muscle relaxation in human penile corpus cavernosum. Biochemistry. 2001 Mar 6;40(9):2678-88. PubMed PMID: 11258879.
  2. Kim SH, Langford ML, Boucher JL, Testerman TL, McGee DJ. Helicobacter pylori arginase mutant colonizes arginase II knockout mice. World J Gastroenterol. 2011 Jul 28;17(28):3300-9. doi: 10.3748/wjg.v17.i28.3300. PubMed PMID: 21876618; PubMed Central PMCID: PMC3160534.
  3. Martens CR, Kuczmarski JM, Lennon-Edwards S, Edwards DG. Impaired L-arginine uptake but not arginase contributes to endothelial dysfunction in rats with chronic kidney disease. J Cardiovasc Pharmacol. 2014 Jan;63(1):40-8. doi: 10.1097/FJC.0000000000000022. PubMed PMID: 24084210.

Products are for research use only. Not for human use.

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