Nα-Fmoc-L-asparagine 4-nitrophenyl ester
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Nα-Fmoc-L-asparagine 4-nitrophenyl ester

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Category
Fmoc-Amino Acids
Catalog number
BAT-003659
CAS number
71989-17-8
Molecular Formula
C25H21N3O7
Molecular Weight
475.46
Nα-Fmoc-L-asparagine 4-nitrophenyl ester
IUPAC Name
(4-nitrophenyl) (2S)-4-amino-2-(9H-fluoren-9-ylmethoxycarbonylamino)-4-oxobutanoate
Synonyms
Fmoc-L-Asn-Onp; (S)-4-Nitrophenyl 2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-4-amino-4-oxobutanoate
Appearance
White powder
Purity
≥ 98% (TLC)
Melting Point
184-188 °C
Storage
Store at 2-8 °C
InChI
InChI=1S/C25H21N3O7/c26-23(29)13-22(24(30)35-16-11-9-15(10-12-16)28(32)33)27-25(31)34-14-21-19-7-3-1-5-17(19)18-6-2-4-8-20(18)21/h1-12,21-22H,13-14H2,(H2,26,29)(H,27,31)/t22-/m0/s1
InChI Key
MPNFRQBESOZRJG-QFIPXVFZSA-N
Canonical SMILES
C1=CC=C2C(=C1)C(C3=CC=CC=C32)COC(=O)NC(CC(=O)N)C(=O)OC4=CC=C(C=C4)[N+](=O)[O-]

Nα-Fmoc-L-asparagine 4-nitrophenyl ester plays a crucial role in peptide synthesis and biochemical research. Here are four key applications presented with high perplexity and burstiness:

Peptide Synthesis: Embraced in solid-phase peptide synthesis (SPPS), Nα-Fmoc-L-asparagine 4-nitrophenyl ester is a versatile tool for integrating asparagine residues into peptides. Its nitrophenyl ester group streamlines coupling reactions with amino groups along the peptide chain, ensuring high yields and purity of the synthesized peptides. These qualities are imperative for biological investigations and pharmaceutical advancements.

Protein Engineering: Facilitating site-specific protein modifications, this compound empowers researchers to explore protein functionalities and interactions. By introducing Nα-Fmoc-L-asparagine derivatives at precise locations, scientists can engineer proteins with tailored properties or functions. Such modifications are indispensable for unraveling protein dynamics, enzyme mechanisms, and the innovation of new biotherapeutics.

Enzyme Assays: Serving as a substrate in enzymatic assays, Nα-Fmoc-L-asparagine 4-nitrophenyl ester enables the measurement of amidases’ and proteases’ activities. Upon enzymatic hydrolysis, the spectrophotometric monitoring of 4-nitrophenyl group release offers a quantitative assessment of enzyme activity. This application holds significance in enzyme characterization, inhibitor screening, and the quest for novel pharmaceutical agents.

Bioconjugation: Within the realm of bioconjugation, Nα-Fmoc-L-asparagine 4-nitrophenyl ester facilitates the coupling of peptides or small molecules to various biomolecules like antibodies and nucleotides. This process gives rise to bioconjugates with specific functional or targeting attributes, which find utility in diagnostic assays, precise drug delivery, and imaging methodologies in the realm of biomedical exploration.

1. β-Glucuronidase-coupled assays of glucuronoyl esterases
Lucia Fraňová, Vladimír Puchart, Peter Biely Anal Biochem. 2016 Oct 1;510:114-119. doi: 10.1016/j.ab.2016.07.023. Epub 2016 Jul 22.
Glucuronoyl esterases (GEs) are microbial enzymes with potential to cleave the ester bonds between lignin alcohols and xylan-bound 4-O-methyl-d-glucuronic acid in plant cell walls. This activity renders GEs attractive research targets for biotechnological applications. One of the factors impeding the progress in GE research is the lack of suitable substrates. In this work, we report a facile preparation of methyl esters of chromogenic 4-nitrophenyl and 5-bromo-4-chloro-3-indolyl β-D-glucuronides for qualitative and quantitative GE assay coupled with β-glucuronidase as the auxiliary enzyme. The indolyl derivative affording a blue indigo-type product is suitable for rapid and sensitive assay of GE in commercial preparations as well as for high throughput screening of microorganisms and genomic and metagenomic libraries.
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