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Cysteine, shown at right in wall-eyed stereo rods representation, is an amino acid and crucial component of protein structure and function. The sulfur (sulfhydryl) group, shown in yellow, is able to bond with other sulfhydryl groups giving rise to internal crosslinks that are vital to the maintainance of correct protein conformation. These types of bonds are especially notable in the molecules comprising the immune system, such as antibodies. This is not all. Cysteine commonly forms the biochemically active core of enzymes, especially in the redox systems. Cysteine is clearly marvellously versitile in its function and structure, and fundamental to living processes. N-acetylated cysteine is often used as supplement, because the acetylation is thought to slow down the incorporation of the amino acid into proteins, so that the anti-oxidant potential of the sulfhydryl group remains in solution. The wall-eyed stereo representation at right gives a pseudo-3D appearance due to the proximity of the light source.

Cysteine related molecules gallery and structural archive

other names: (R)-2-Amino-3-mercaptopropanoic acid (R)-2-Amino-3-mercaptopropionic acid (R)-Cysteine 2-Amino-3-mercaptopropanoic acid, (R)- 2-Amino-3-mercaptopropionic acid 4371-52-2 52-90-4 7048-04-6 AI3-26559 CCRIS 912 Cisteina [INN-Spanish] Cisteina [Spanish] Cisteinum [Latin] Cystein Cysteine Cysteine, L- Cysteinum [INN-Latin] EINECS 200-158-2 FEMA No. 3263 HSDB 2109 Half cystine Half-cystine L-(+)-Cysteine L-2-Amino-3-mercaptopropanoic acid L-Alanine, 3-mercapto- L-CYSTEINE NSC-8746 Propanoic acid, 2-amino-3-mercapto-, (R)- Thioserine alpha-Amino-beta-mercaptopropanoic acid, L- alpha-Amino-beta-mercaptopropionic acid, L- alpha-Amino-beta-thiolpropionic acid alpha-Amino-beta-thiolpropionic acid, L- beta-Mercaptoalanine beta-Mercaptoalanine

related molecule names: CYSTEINE DERIV L-Cysteine, N-[N-[N-[(phenylmethoxy)carbonyl]-.beta.-alanyl]-S-(phenylmethyl)-L-cysteinyl]-S-(triphenylmethyl)-, methyl ester NSC234762 (R)-2-Amino-3-mercaptopropanoic acid (R)-2-Amino-3-mercaptopropionic acid (R)-Cysteine 2-Amino-3-mercaptopropanoic acid, (R)- 2-Amino-3-mercaptopropionic acid 4371-52-2 52-90-4 7048-04-6 AI3-26559 CCRIS 912 Cisteina [INN-Spanish] Cisteina [Spanish] Cisteinum [Latin] Cystein Cysteine Cysteine, L- Cysteinum [INN-Latin] EINECS 200-158-2 FEMA No. 3263 HSDB 2109 Half cystine Half-cystine L-(+)-Cysteine L-2-Amino-3-mercaptopropanoic acid L-Alanine, 3-mercapto- L-CYSTEINE NSC-8746 Propanoic acid, 2-amino-3-mercapto-, (R)- Thioserine alpha-Amino-beta-mercaptopropanoic acid, L- alpha-Amino-beta-mercaptopropionic acid, L- alpha-Amino-beta-thiolpropionic acid alpha-Amino-beta-thiolpropionic acid, L- beta-Mercaptoalanine beta-Mercaptoalanine, L- 454-28-4 HOMOCYSTEINE (+-)-Homocysteine 454-29-5 BRN 5493225 Butyric acid, 2-amino-4-mercapto-, DL- (9CI) D,L-Homocysteine DL-2-Amino-4-mercaptobutyric acid DL-Homocysteine EINECS 207-222-9 HOMOCYSTEINE NSC 206252 USAF B-12 18829-79-3 19542-74-6 616-91-1 63664-54-0 7696-05-1 ACETYLCYSTEINE Acetadote Acetein (L)-2-Amino-3-(carboxymethylthio)propionic acid (R)-S-(Carboxymethyl)cysteine 11139-64-3 3-(Carboxymethylthio)-L-alanine 4-04-00-03150 (Beilstein Handbook Reference) 638-23-3 AHR 3053 Alanine, 3-((carboxymethyl)thio)-, L- BRN 1725012 Bronchokod Carbocisteina [INN-Spanish] Carbocisteine Carbocisteinum [INN-Latin] Carbocysteine EINECS 211-327-5 Fluifort L-3-((Carboxymethyl)thio)alanine L-Cysteine, S-(carboxymethyl)- L.J. 206 LJ 206 Lisomucil Muciclar Mucocis Mucodyne Mucojet sirup Mucolex sirup NSC 14156 Reomucil Rhinathiol Rinatiol S-(CARBOXYMETHYL)-L-CYSTEINE S-(Carboxymethyl)-(R)-cysteine S-Carboxylmethyl-L-cysteine Superthiol sirup Thiodril Transbronchin 3411-58-3 868-59-7 CYSTEINE, ETHYL ESTER, HYDROCHLORIDE, L- Cysteine ethyl ester hydrochloride Cysteine ethyl ester hydrochloride (VAN) EINECS 212-779-6 Ethitanin Ethyl L-cysteinate hydrochloride Ethyl cysteine hydrochloride L-Cysteine, ethyl ester, hydrochloride Mucastine NSC 117387 NSC 519837 Taiciscon Teincy (S)-5'-(S)-(3-Amino-3-carboxypropyl)-5'-thioadenosine 979-92-0 EINECS 213-560-8 L-Homocysteine, S-(5'-deoxyadenosin-5'-yl)- S-ADENOSYLHOMOCYSTEINE S-Adenosyl-L-homocysteine (+-)-Cysteine 3374-22-9 CYSTEINE, DL- DL-Cysteine EINECS 222-160-2 NSC 63864 dl-Cysteina [Polish] 2-(Aminoethyl)cysteine monohydrochloride 2-Amino-ethyl-cystein monohydrochloride 2936-69-8 4099-35-8 Alanine, 3-((2-aminoethyl)thio)-, monohydrochloride, L- (7CI,8CI) CYSTEINE, S-(2-AMINOETHYL)-, MONOHYDROCHLORIDE, L- EINECS 223-862-1 L-Cysteine, S-(2-aminoethyl)-, monohydrochloride (9CI) LJ 226 NSC 186915 S-(2-Aminoethyl)-L-cysteine monohydrochloride S-(beta-Amino ethyl) cysteine monochlorhydrate [French] S-(beta-Aminoethyl)-L-cysteine hydrochloride Thialysine hydrochloride USAF XR-43 4371-52-2 CYSTEINE 5191-80-0 Alanine, 3-((diphenylmethyl)thio)-, L- (8CI) Alanine, 3-(diphenylmethylthio)-, L- BRN 2565688 CYSTEINE, S-DIPHENYLMETHYL-, L- L-3-(Diphenylmethylthio)alanine L-Cysteine, S-(diphenylmethyl)- (9CI) NSC 86162 S-Benzhydryl-L-cysteine S-Diphenylmethyl-L-cysteine 5714-80-7 Cysteine, methyl ester, hydrochloride EINECS 227-208-6 METHYL DL-CYSTEINE HYDROCHLORIDE Methyl DL-cysteinate hydrochloride 52-90-4 7048-04-6 Cysteine hydrochloride [USAN] Cysteine hydrochloride monohydrate, L- L-CYSTEINE, HYDROCHLORIDE, MONOHYDRATE L-Cysteine hydrochloride monohydrate L-Cysteine monohydrate monochloride 1637-71-4 7381-67-1 CYSTEINE, HYDROGEN SULFATE (ester), SODIUM SALT, HYDRATE (2:2:3) NSC 344479 Sodium S-sulfocysteine hydrate 7546-23-8 CALCIUM ACETYLCYSTEINE 10236-58-5 L-Alanine, 3-selenyl- SELENOCYSTEINE (+-)-Cysteine hydrochloride 10318-18-0 CYSTEINE, HYDROCHLORIDE, DL- DL-Cysteine hydrochloride hydrate EINECS 233-698-2 18312-66-8 3-Selenyl-DL-alanine Alanine, 3-selenyl-, (+-)- HSDB 3534 SELENO-(DL)-CYSTEINE Selenium-cystine Seleno-DL-cysteine d,l-Selenocysteine (R)-Cysteine methyl ester hydrochloride 12767-12-3 18598-63-5 7319-35-9 Acdrile Acthiol aerosol Actiol Actiol J CYSTEINE, METHYL ESTER, HYDROCHLORIDE, L- Chistait Cysteine, methyl ester, hydrochloride (VAN) EINECS 242-435-0 Epecoale hydrochloride Jeorgen L-Cysteine, methyl ester, hydrochloride L.J. 48 Mecysteine hydrochloride Methyl L-cysteinate hydrochloride Methyl alpha-amino-beta-mercaptopropionate hydrochloride Methyl beta-mercaptoalanine hydrochloride Methyl cysteine hydrochloride Methyl cysteine hydrochloride (VAN) NSC 161611 Pectite Visclair Zeotin acthiol J 19538-78-4 4-04-00-03160 (Beilstein Handbook Reference) BRN 1723891 CYSTEINE, N-FORMYL-, L- N-Formyl cysteine 21861-11-0 S-(2-CARBOXY-1-METHYLETHYL)-L-CYSTEINE 22196-52-7 ETHYL-CYSTEINE 23815-63-6 4-06-00-01764 (Beilstein Handbook Reference) BRN 2544571 CCRIS 1805 L-CYSTEINE, S-(2,4-DINITROPHENYL)- NSC 89977 S-(2,4-Dinitrophenyl)cysteine 40454-21-5 BRN 2087654 CYSTEINE, N-AMIDINO-, L- EINECS 254-925-1 IQB-782 Iqb 782 L-Cysteine, N-(aminoiminomethyl)- N-Amidino-L-cysteine N-Amidinocysteine N-Guanidine-beta-mercaptoalanine N-Guanyl-cysteine 51209-75-7 CYSTEINE, N-NITROSO- Nitrosocysteine S-Nitroso-L-cysteine S-Nitrosocysteine 2-Amino-4-carboxymethylthio-buttersaure [German] 55593-14-1 ACTB DL-2-Amino-4-carboxymethylthiobutyric acid DL-HOMOCYSTEINE, S-(CARBOXYMETHYL)- S-(Carboxymethyl)-DL-homocysteine 58100-26-8 Cysteine hydrazide Cysteine, hydrazide, L- L-CYSTEINE, HYDRAZIDE 58337-49-8 CCRIS 5340 L-CYSTEINE, N-ACETYL-S-(2-CHLOROETHYL)- N-Acetyl-S-(2-chloroethyl)-L-cysteine N-Acetyl-S-(2-chloroethyl)cysteine 61772-62-1 BRN 1975183 L-CYSTEINE, BIS(2-METHYLPROPYL)CARBAMATE (ester) S-(Diisobutylcarbamoyl)cysteine 61772-64-3 BRN 1993479 L-CYSTEINE, N-ACETYL-, DIPROPYLCARBAMATE (ester) N-Acetyl-L-cysteine dipropylcarbamate (ester) S-(N,N-Dipropylcarbamoyl)-N-acetylcysteine 61772-65-4 BRN 1995091 L-CYSTEINE, N-ACETYL-, BIS(2-METHYLPROPYL)CARBAMATE (ester) N-Acetyl-L-cysteine bis(2-methylpropyl)carbamate (ester) 61772-66-5 BRN 1985893 L-CYSTEINE, N-ACETYL-, (2-METHYLPROPYL)CARBAMATE (ester) N-Acetyl-L-cysteine (2-methylpropyl)carbamate (ester) 616-91-1 63664-54-0 Acetylcysteine sodium L-CYSTEINE, N-ACETYL-, SODIUM SALT 65002-17-7 Bucilamina [Spanish] Bucillamine Bucillamine [INN:JAN] Bucillaminum [Latin] CCRIS 5260 De-019 L-CYSTEINE, N-(2-MERCAPTO-2-METHYL-1-OXOPROPYL)- N-(2-Mercapto-2-methyl-1-oxopropyl)-L-cysteine N-(2-Mercapto-2-methylpropanoyl)-L-cysteine N-(2-Mercapto-2-methylpropionyl)-L-cysteine N-(2-Mercaptoisobutyryl)-L-cysteine Rimatil SA96 Thiobutarit Tiobutarit 74407-29-7 BRN 5518859 CCRIS 5262 CYSTEINE, N-(2-METHYL-2-(METHYLTHIO)PROPIONYL)-, L- L-Cysteine, N-(2-methyl-2-(methylthio)-1-oxopropyl)- N-(2-Methyl-2-(methylthio)propionyl)-L-cysteine SA 679 83768-87-0 CCRIS 1377 DL-HOMOCYSTEINE, S-ETHENYL- S-Vinyl-dl-homocysteine Vinthionine 84214-30-2 CYSTEINE, IRON(II) chelate 87619-82-7 CCRIS 2171 L-CYSTEINE, S-(1,2,3,4,4-PENTACHLORO-1,3-BUTADIENYL)- S-(1,2,3,4,4-Pentachloro-1,3-butadienyl)-L-cysteine S-Pentachlorobuta-1,3-dien-yl-cysteine 89784-39-4 CCRIS 1308 L-CYSTEINE, N-ACETYL-S-(1,2,3,4,4-PENTACHLORO-1,3-BUTADIENYL)- N-Acetyl-S-(1,2,3,4,4-pentachlorobutadienyl)-L-cysteine N-Acetyl-S-pentachloro-1,3-butadienylcysteine S-Pentachlorobutadienyl-N-acetylcysteine 91776-42-0 Fibrostatin A L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-1-HYDROXY-3-METHOXY-7-METHYL-5,8-DIOXO-2-NA L-Cysteine, N-acetyl-S-((5,8-dihydro-1-hydroxy-3-methoxy-7-methyl-5,8-dioxo-2-naphthalenyl)methyl)- 91776-44-2 Fibrostatin E L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-1-HYDROXY-7-(HYDROXYMETHYL)-3-METHOXY-5,8-D L-Cysteine, N-acetyl-S-((5,8-dihydro-1-hydroxy-7-(hydroxymethyl)-3-methoxy-5,8-dioxo-2-naphthalenyl)methyl)- 91776-45-3 Fibrostatin F L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-3,6-DIMETHOXY-5,8-DIOXO-1-HYDROXY-7-(HYDROX L-Cysteine, N-acetyl-S-((5,8-dihydro-3,6-dimethoxy-5,8-dioxo-1-hydroxy-7-(hydroxymethyl)-2-naphthalenyl)methyl)- 91776-47-5 Fibrostatin C L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-1-HYDROXY-3,6-DIMETHOXY-5,8-DIOXO-2-NAPHTHA L-Cysteine, N-acetyl-S-((5,8-dihydro-1-hydroxy-3,6-dimethoxy-5,8-dioxo-2-naphthalenyl)methyl)- N-Acetyl-S-((5,8-dihydro-1-hydroxy-3,6-dimethoxy-5,8-dioxo-2-naphthalenyl)methyl)-L-cysteine 91776-48-6 Fibrostatin B L-CYSTEINE, N-ACETYL-S-((5,8-DIHYDRO-1-HYDROXY-3,6-DIMETHOXY-7-METHYL-5,8-DIOXO- L-Cysteine, N-acetyl-S-((5,8-dihydro-1-hydroxy-3,6-dimethoxy-7-methyl-5,8-dioxo-2-naphthalenyl)methyl)- 101144-57-4 CYSTEINE, N-((5-CHLORO-8-HYDROXY-3-METHYL-1-OXO-7-ISOCHROMANYL)CARBONYL)- L-Cysteine, N-((5-chloro-3,4-dihydro-8-hydroxy-3-methyl-1-oxo-1H-2-benzopyran-7-yl)carbonyl)- N-((5-Chloro-8-hydroxy-3-methyl-1-oxo-7-isochromanyl)carbonyl)cysteine (R)-Cysteine hydrochloride 122641-75-2 122882-13-7 124558-06-1 29844-56-2 3-Mercaptoalanine hydrochloride 52-89-1 AI3-18781 CCRIS 3613 CYSTEINE HYDROCHLORIDE Cystein chloride Cysteine chlorhydrate Cysteine hydrochloride anhydrous Cysteine monohydrochloride Cysteine, L-, hydrochloride Cysteine, L-, monohydrochloride EINECS 200-157-7 EK 2367 L-(+)-Cysteine hydrochloride L-2-Amino-3-mercaptopropanoic acid monohydrochloride L-Cysteine hydrochloride L-Cysteine monohydrochloride L-Cysteine, hydrochloride NSC 8746 WR 348 (R)-Cysteine-hydrochloride 3-Mercaptoalanine hydrochloride 52-89-1 CYSTEINE, (L) Cystein chloride Cysteine chlorhydrate Cysteine chlorohydrate Cysteine hydrochloride Cysteine, hydrochloride, L- EK 2367 L-(+)-Cysteine hydrochloride L-Cystein-hydrochloride L-Cysteine hydrochloride L-Cysteine, hydrochloride NSC8746 WLN: SH1YZVQ &GH -L 61823-92-5 B 708456K033 CYSTEINE, 5-[(METHYLTHIO)METHYL]-, ETHYL ESTER NSC233867 L-Homocysteine, N-[S-(dimethylarsino)-L-homocysteinyl]-, dimethylarsinite (ester) N-[S-(DIMETHYLARSINO)-L-HOMOCYSTINYL]-L-HOMOCYSTEINE, DIMETHYLARSINITE (ESTER) NSC294881

molecule directory: 148667

related molecule directories:
133724
153187
153188
155349
155843
156712
157123
161782
162892
163209
164031
164653
166039
166384
166693
167858
167925
171412
171524
171938
172905
173038
174109
179693
180883
182207
183141
183222
184116
184117
184118
184119
184769
186785
190933
192626
192685
193134
193365
193625
193626
193627
193628
193629
195079
197178
539499
567631
572287

related molecule pdb files:
133724.pdb
153187.pdb
153188.pdb
155349.pdb
155843.pdb
156712.pdb
157123.pdb
161782.pdb
162892.pdb
163209.pdb
164031.pdb
164653.pdb
166039.pdb
166384.pdb
166693.pdb
167858.pdb
167925.pdb
171412.pdb
171524.pdb
171938.pdb
172905.pdb
173038.pdb
174109.pdb
179693.pdb
180883.pdb
182207.pdb
183141.pdb
183222.pdb
184116.pdb
184117.pdb
184118.pdb
184119.pdb
184769.pdb
186785.pdb
190933.pdb
192626.pdb
192685.pdb
193134.pdb
193365.pdb
193625.pdb
193626.pdb
193627.pdb
193628.pdb
193629.pdb
195079.pdb
197178.pdb
539499.pdb
567631.pdb
572287.pdb

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