Unnatural amino acids

By Targets:	Amino Acid Derivatives (3) Bacterial (1) Biochemical Assay Reagents (2) Drug Intermediate (2) Endogenous Metabolite (2) Fluorescent Dye (1) Fructose-1,6-bisphosphate aldolase (2) Isotope-Labeled Compounds (1) Ligands for E3 Ligase (1)
By Research Areas:	Cancer (2) Infection (1) Metabolic Disease (2)
Click Chemistry:	Labeling and Fluorescence Imaging (1) Azide (1) Alkynes (1)

Targets Recommended: Branched Chain Amino Acid Transaminase (BCAT) Amino Acid Decarboxylase Amino Acid Oxidase Amino Acid Derivatives Amino acid Transporter EAAT ELOVL

Cat. No.	Product Name	Target	Research Areas	Chemical Structure

HY-131033

L-Azidonorleucine hydrochloride	Biochemical Assay Reagents	Others
L-Azidonorleucine hydrochloride, an unnatural amino acid, is A Methionine surrogate. L-Azidonorleucine hydrochloride can be used to label mammalian cell proteins and identify a diverse set of methionyl-tRNA synthetase (MetRS) mutants . L-Azidonorleucine (hydrochloride) is a click chemistry reagent, it contains an Azide group and can undergo copper-catalyzed azide-alkyne cycloaddition reaction (CuAAc) with molecules containing Alkyne groups. It can also undergo strain-promoted alkyne-azide cycloaddition (SPAAC) reactions with molecules containing DBCO or BCN groups.

HY-W007655

Fmoc-D-Lys(Boc)-OH	Biochemical Assay Reagents Amino Acid Derivatives	Others
Fmoc-D-Lys (Boc)-OH is an Fmoc- and Boc-protected D-lysine derivative. Fmoc-D-Lys (Boc)-OH ensures the precise incorporation of D-lysine into peptide chains, maintaining the specific conformation and biological activity of peptides. Fmoc-D-Lys (Boc)-OH can be used in research on the synthesis of peptides containing unnatural amino acids .

HY-W004864

Fmoc-(S)-2-(4-pentenyl)Ala-OH	Amino Acid Derivatives	Others
Fmoc-(S)-2-(4-pentenyl) Ala-OH is an Fmoc-protected unnatural amino acid. Fmoc-(S)-2-(4-pentenyl) Ala-OH can be used for polypeptide synthesis, such as NYAD-13 (HY-P10834) .

HY-W012874

D-Threonine H-D-Thr-OH	Fructose-1,6-bisphosphate aldolase Endogenous Metabolite Drug Intermediate	Metabolic Disease
D-Threonine (H-D-Thr-OH) is one of the important unnatural amino acids used as chiral building blocks in pharmaceutical drugs. D-Threonine is a metabolite of Saccharomyces cerevisiae. D-Threonine is cleaved into glycine and acetaldehyde by the catalytic action of D-threonine aldolase .

HY-139014

N-ε-propargyloxycarbonyl-L-lysine 1 Publications Verification H-L-Lys(Poc)-OH	Fluorescent Dye	Cancer
N-ε-propargyloxycarbonyl-L-lysine (H-L-Lys(Poc)-OH) is a lysine-based unnatural amino acid (UAA). N-ε-propargyloxycarbonyl-L-lysine is widely used for bio-conjugation of fluorescent probes in diverse organisms from E. coli to mammalian cells even in animals . N-ε-propargyloxycarbonyl-L-lysine is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.

HY-125409A

(S,R)-Lysinoalanine	Amino Acid Derivatives	Others
(S,R)-Lysinoalanine is an unnatural amino acid that can be formed in food submitted to thermal treatment, especially in alkaline conditions .

HY-W012874S

D-Threonine-d2 H-D-Thr-OH-d₂	Isotope-Labeled Compounds Fructose-1,6-bisphosphate aldolase Endogenous Metabolite Drug Intermediate	Metabolic Disease
D-Threonine-d₂ (H-D-Thr-OH-d₂) is the deuterium labeled D-Threonine (HY-W012874). D-Threonine is one of the important unnatural amino acids used as chiral building blocks in pharmaceutical drugs. D-Threonine is a metabolite of Saccharomyces cerevisiae. D-Threonine is cleaved into glycine and acetaldehyde by the catalytic action of D-threonine aldolase.

HY-179735

CRBN ligand-192	Ligands for E3 Ligase	Cancer
CRBN ligand-192 is an E3 ligand that can be used for the synthesis of PROTACs, such as PROTAC BRD4 Degrader-41 (HY-179734). PROTAC BRD4 Degrader-41 is a potent BRD4 PROTAC degrader with anti-cancer activity .

HY-P11615

FuK	Bacterial	Infection
FuK is a WK₂-analog antimicrobial peptide modified with fluorinated unnatural amino acids. FuK has an LD₅₀ of 72.34 mg/kg in mice, shows no hemolytic activity, with high stability against trypsin, chymotrypsin, and saline environments. FuK exerts bactericidal effects by enhancing the permeability of bacterial outer membranes, inducing depolarization of cytoplasmic membranes, and disrupting membrane potential balance against bacterias such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, and MRSA. FuK exhibits synergistic antimicrobial activity with polymyxin B (HY-149179), vancomycin (HY-B0671), and ciprofloxacin (HY-B0356), and also inhibits Ciprofloxacin-induced bacterial drug resistance. FuK has in vivo safety, effectively reduces bacterial load and inflammatory cell infiltration in a mouse MRSA model, and promotes collagen fiber formation in skin wounds .

Cat. No.	Product Name

HY-L937

Unnatural Amino Acids Fragment library	931 compounds
Unnatural amino acids (UAAs), also referred to as non-canonical amino acids (ncAAs) or non-proteinogenic amino acids, are a class of amino acids that are distinct from the 20 standard natural amino acids. They can be obtained through chemical synthesis, biosynthesis, and other approaches, with structural diversity far exceeding that of natural amino acids. UAAs are mainly including naturally occurring non-canonical amino acids, chemically synthesized amino acids, and biosynthetic amino acids, which provide a molecular basis for protein function design. UAAs exhibit significant value in multiple fields. They can optimize the pharmacokinetic properties of peptide drugs and peptidomimetics, modify enzyme functions and endow them with new biological activities, thereby overcoming the limitations of traditional peptide drugs and expanding the chemical space . Meanwhile, UAAs can serve as molecular probes to analyze protein-protein interactions and investigate the regulatory mechanisms of protein functions. MCE has compiled a UAAs Fragment Library comprising nearly a thousand unnatural amino acid fragments with extensive coverage of chemical space and enhanced structural diversity. This compound library can be widely applied in peptide synthesis, drug design, and protein engineering.

Unnatural Amino Acids Fragment library

931 compounds

Unnatural amino acids (UAAs), also referred to as non-canonical amino acids (ncAAs) or non-proteinogenic amino acids, are a class of amino acids that are distinct from the 20 standard natural amino acids. They can be obtained through chemical synthesis, biosynthesis, and other approaches, with structural diversity far exceeding that of natural amino acids. UAAs are mainly including naturally occurring non-canonical amino acids, chemically synthesized amino acids, and biosynthetic amino acids, which provide a molecular basis for protein function design.

UAAs exhibit significant value in multiple fields. They can optimize the pharmacokinetic properties of peptide drugs and peptidomimetics, modify enzyme functions and endow them with new biological activities, thereby overcoming the limitations of traditional peptide drugs and expanding the chemical space . Meanwhile, UAAs can serve as molecular probes to analyze protein-protein interactions and investigate the regulatory mechanisms of protein functions.

MCE has compiled a UAAs Fragment Library comprising nearly a thousand unnatural amino acid fragments with extensive coverage of chemical space and enhanced structural diversity. This compound library can be widely applied in peptide synthesis, drug design, and protein engineering.

HY-LD005

DEL D Kit Cyclic Peptide Library	1.2 billion compounds
Cyclic peptide library have advantages such as high affinity, high selectivity, and suitability for targeting protein–protein interactions. Through DEL synthesis technology, the library size can achieve hundreds of millions. DEL cyclic peptide library have advantages like low cost andhigh screeing efficiency, making them valuable for discovering lead compounds against challenging drug targets. This cyclic peptide library is constructed with unnatural amino acids as building block, synthesized through DNA-compatible chemical reactions. Each cyclic peptide consist of six amino acids and constrained conformations such as side-chain cross-linking, disulfide bonds, and macrocyclization. These cyclic peptides exhibit significantly improved stability and druggability compared with linear peptides, filling the gap between small molecules and macromolecular biologics. Each cyclic peptide is uniquely conjugated to a DNA barcode sequence for molecular identification and sequencing decoding. MCE’s cyclic peptide library has8 independent sub-libraries, with a total molecular diversity of 1.2 billion. It is constructed via multi-round combinatorial assembly of building blocks and diverse cyclization strategies, facilitating the discovery of cyclic peptide leads for undruggable targets.

DEL D Kit Cyclic Peptide Library

1.2 billion compounds

Cyclic peptide library have advantages such as high affinity, high selectivity, and suitability for targeting protein–protein interactions. Through DEL synthesis technology, the library size can achieve hundreds of millions. DEL cyclic peptide library have advantages like low cost andhigh screeing efficiency, making them valuable for discovering lead compounds against challenging drug targets.

This cyclic peptide library is constructed with unnatural amino acids as building block, synthesized through DNA-compatible chemical reactions. Each cyclic peptide consist of six amino acids and constrained conformations such as side-chain cross-linking, disulfide bonds, and macrocyclization. These cyclic peptides exhibit significantly improved stability and druggability compared with linear peptides, filling the gap between small molecules and macromolecular biologics. Each cyclic peptide is uniquely conjugated to a DNA barcode sequence for molecular identification and sequencing decoding.

MCE’s cyclic peptide library has8 independent sub-libraries, with a total molecular diversity of 1.2 billion. It is constructed via multi-round combinatorial assembly of building blocks and diverse cyclization strategies, facilitating the discovery of cyclic peptide leads for undruggable targets.

Cat. No.	Product Name	Type

HY-W007655

Fmoc-D-Lys(Boc)-OH	Biochemical Assay Reagents
Fmoc-D-Lys (Boc)-OH is an Fmoc- and Boc-protected D-lysine derivative. Fmoc-D-Lys (Boc)-OH ensures the precise incorporation of D-lysine into peptide chains, maintaining the specific conformation and biological activity of peptides. Fmoc-D-Lys (Boc)-OH can be used in research on the synthesis of peptides containing unnatural amino acids .

Cat. No.	Product Name	Target	Research Area

HY-W004864

Fmoc-(S)-2-(4-pentenyl)Ala-OH	Amino Acid Derivatives	Others
Fmoc-(S)-2-(4-pentenyl) Ala-OH is an Fmoc-protected unnatural amino acid. Fmoc-(S)-2-(4-pentenyl) Ala-OH can be used for polypeptide synthesis, such as NYAD-13 (HY-P10834) .

HY-P11615

FuK	Bacterial	Infection
FuK is a WK₂-analog antimicrobial peptide modified with fluorinated unnatural amino acids. FuK has an LD₅₀ of 72.34 mg/kg in mice, shows no hemolytic activity, with high stability against trypsin, chymotrypsin, and saline environments. FuK exerts bactericidal effects by enhancing the permeability of bacterial outer membranes, inducing depolarization of cytoplasmic membranes, and disrupting membrane potential balance against bacterias such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, and MRSA. FuK exhibits synergistic antimicrobial activity with polymyxin B (HY-149179), vancomycin (HY-B0671), and ciprofloxacin (HY-B0356), and also inhibits Ciprofloxacin-induced bacterial drug resistance. FuK has in vivo safety, effectively reduces bacterial load and inflammatory cell infiltration in a mouse MRSA model, and promotes collagen fiber formation in skin wounds .

Cat. No.	Product Name	Category	Target	Chemical Structure

HY-W012874

D-Threonine H-D-Thr-OH	Structural Classification Natural Products Classification of Application Fields Metabolic Disease Endogenous metabolite Disease Research Fields Source Classification	Fructose-1,6-bisphosphate aldolase Endogenous Metabolite Drug Intermediate
D-Threonine (H-D-Thr-OH) is one of the important unnatural amino acids used as chiral building blocks in pharmaceutical drugs. D-Threonine is a metabolite of Saccharomyces cerevisiae. D-Threonine is cleaved into glycine and acetaldehyde by the catalytic action of D-threonine aldolase .

Cat. No.	Product Name	Chemical Structure

HY-W012874S

D-Threonine-d2
D-Threonine-d₂ (H-D-Thr-OH-d₂) is the deuterium labeled D-Threonine (HY-W012874). D-Threonine is one of the important unnatural amino acids used as chiral building blocks in pharmaceutical drugs. D-Threonine is a metabolite of Saccharomyces cerevisiae. D-Threonine is cleaved into glycine and acetaldehyde by the catalytic action of D-threonine aldolase.

Cat. No.	Product Name		Classification

HY-131033

L-Azidonorleucine hydrochloride		Azide
L-Azidonorleucine hydrochloride, an unnatural amino acid, is A Methionine surrogate. L-Azidonorleucine hydrochloride can be used to label mammalian cell proteins and identify a diverse set of methionyl-tRNA synthetase (MetRS) mutants . L-Azidonorleucine (hydrochloride) is a click chemistry reagent, it contains an Azide group and can undergo copper-catalyzed azide-alkyne cycloaddition reaction (CuAAc) with molecules containing Alkyne groups. It can also undergo strain-promoted alkyne-azide cycloaddition (SPAAC) reactions with molecules containing DBCO or BCN groups.

HY-139014

N-ε-propargyloxycarbonyl-L-lysine 1 Publications Verification H-L-Lys(Poc)-OH		Labeling and Fluorescence Imaging Alkynes
N-ε-propargyloxycarbonyl-L-lysine (H-L-Lys(Poc)-OH) is a lysine-based unnatural amino acid (UAA). N-ε-propargyloxycarbonyl-L-lysine is widely used for bio-conjugation of fluorescent probes in diverse organisms from E. coli to mammalian cells even in animals . N-ε-propargyloxycarbonyl-L-lysine is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.

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