Selenocistein

Izvor: Wikipedia
Selenocistein[1]
L-selenocysteine-2D-skeletal.png
Selenocysteine-3D-vdW.png
IUPAC ime
Drugi nazivi L-Selenocistein; 3-Selanil-L-alanin; Selen cistein
Identifikacija
CAS registarski broj 10236-58-5 YesY
PubChem[2][3] 25076
ChemSpider[4] 23436 YesY
DrugBank DB02345
KEGG[5] C05688
ChEBI 16633
ChEMBL[6] CHEMBL109962 YesY
Jmol-3D slike Slika 1
Svojstva
Molekulska formula C3H7NO2Se
Molarna masa 168.05 g mol−1

 YesY (šta je ovo?)   (verifikuj)

Ukoliko nije drugačije napomenuto, podaci se odnose na standardno stanje (25 °C, 100 kPa) materijala

Infobox references

Selenocistein (Se-Cys) je aminokiselina koja je prisutna u više enzima (na primer: glutationske peroksidaze, tetrajodotironin 5' dejodinaze, tioredoksin reduktaze, format dehidrogenaze, glicin reduktaze, i pojedine hidrogenaze).

Nomenklatura[uredi - уреди]

IUPAC/IUBMB su zvanično preporučili simbole Sec i U za selenocistein.[7]

Struktura[uredi - уреди]

Selenocistein je strukturno sličan sa cisteinom. Jedan atom selena zauzima mesto sumpora, formirajući selenol grupu. Proteini koji sadrže jedan ili više selenocisteinskih ostataka se nazivaju selenoproteinima.

Biologija[uredi - уреди]

Selenocistein ima nižu pKa vrednost (5.47) i viši redukcioni potencijal od cisteina. Te osobine ga čine veoma podobnim za proteine koji učestvuju u antioksidantskim aktivnostima.[8]

Reference[uredi - уреди]

  1. Susan Budavari, ur. (2001). The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (13th izd.). Merck Publishing. ISBN 0-911910-13-1. http://www.merckbooks.com/mindex/online.html. 
  2. Li Q, Cheng T, Wang Y, Bryant SH (2010). "PubChem as a public resource for drug discovery.". Drug Discov Today 15 (23-24): 1052-7. DOI:10.1016/j.drudis.2010.10.003. PMID 20970519.  edit
  3. Evan E. Bolton, Yanli Wang, Paul A. Thiessen, Stephen H. Bryant (2008). "Chapter 12 PubChem: Integrated Platform of Small Molecules and Biological Activities". Annual Reports in Computational Chemistry 4: 217-241. DOI:10.1016/S1574-1400(08)00012-1. 
  4. Hettne KM, Williams AJ, van Mulligen EM, Kleinjans J, Tkachenko V, Kors JA. (2010). "Automatic vs. manual curation of a multi-source chemical dictionary: the impact on text mining". J Cheminform 2 (1): 3. DOI:10.1186/1758-2946-2-3. PMID 20331846.  edit
  5. Joanne Wixon, Douglas Kell (2000). "Website Review: The Kyoto Encyclopedia of Genes and Genomes — KEGG". Yeast 17 (1): 48–55. DOI:<48::AID-YEA2>3.0.CO;2-H 10.1002/(SICI)1097-0061(200004)17:1<48::AID-YEA2>3.0.CO;2-H. 
  6. Gaulton A, Bellis LJ, Bento AP, Chambers J, Davies M, Hersey A, Light Y, McGlinchey S, Michalovich D, Al-Lazikani B, Overington JP. (2012). "ChEMBL: a large-scale bioactivity database for drug discovery". Nucleic Acids Res 40 (Database issue): D1100-7. DOI:10.1093/nar/gkr777. PMID 21948594.  edit
  7. IUPAC-IUBMB Joint Commission on Biochemical Nomenclature (JCBN) and Nomenclature Committee of IUBMB (NC-IUBMB) (1999). "Newsletter 1999" (reprint, with permission). European Journal of Biochemistry 264 (2): 607–609. DOI:10.1046/j.1432-1327.1999.news99.x. 
  8. BJ. Byun and YK. Kang (2011). "Conformational preferences and pK(a) value of selenocysteine residue.". Biopolymers 95 (5): 345–53. DOI:10.1002/bip.21581. PMID 21213257. 

Literatura[uredi - уреди]

  • F. Zinoni, A. Birkmann, T. C. Stadtman and A. Bock (1986). "Nucleotide sequence and expression of the selenocysteine-containing polypeptide of formate dehydrogenase (formate-hydrogen-lyase-linked) from Escherichia coli". PNAS 83 (13): 4650–4654. DOI:10.1073/pnas.83.13.4650. PMID 2941757. 
  • F. Zinoni, A. Birkmann, W. Leinfelder and A. Bock (1987). "Cotranslational insertion of selenocysteine into formate dehydrogenase from Escherichia coli directed by a UGA codon". PNAS 84 (10): 3156–3160. DOI:10.1073/pnas.84.10.3156. PMID 3033637. 
  • Boyce E. Cone, Rafael Martin Del Rio, Joe Nathan Davis, and Thressa C. Stadtman (1976). "Chemical characterization of the selenoprotein component of clostridial glycine reductase: identification of selenocysteine as the organoselenium moiety". PNAS 73 (8): 2659–63. DOI:10.1073/pnas.73.8.2659. PMID 1066676. 

Spoljašnje veze[uredi - уреди]