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Proteinski dimer

Dijagram dimera Ešerihija kolijeve galaktoze-1-fosfat uridililtransferaze (GALT) u kompleksu sa UDP-galaktozom. Joni kalijuma, cinka, i gvožđa su vidljivi kao ljubičasto, sivo, bronzano-obojene sfere.

U biohemiji, dimer je makromolekularni kompleks formiran od dva, obično ne-kovalentno vezana, makromolekula kao što su proteini ili nukleinske kiseline. Dimer je kvaternarna struktura proteina.[1]

Homodimer se formira od dva identična molekula (procesom homodimerizacije). Heterodimer se formira od dva različita makromolekula (procesom heterodimerizacije).

Većina dimera u biohemiji nije vezana kovalentnim vezama izuzev disulfidnih veza. Primer takvih enzima je reverzibilna transkriptaza, kaja se sastoji od dva različita aminokiselinska lanca.[2]

Neki proteini sadrže specijalizovane domene koji omogućuju dimerizaciju (dimerizacioni domeni).

  1. ^ Branden C; Tooze J. Introduction to Protein Structure. New York, NY: Garland Publishing. ISBN 0-8153-2305-0. 
  2. ^ Nicolas Sluis-Cremer; Noureddine Hamamouch; Ana San Félix; Sonsoles Velázquez; Jan Balzarini & María-José Camarasa (2006). „Structure-Activity Relationships of [2‘,5‘-Bis-O-(tert-butyldimethylsilyl)-ß-d-ribofuranosyl]- 3‘-spiro-5‘ ‘-(4‘ ‘-amino-1‘ ‘,2‘ ‘-oxathiole-2‘ ‘,2‘ ‘-dioxide)thymine Derivatives as Inhibitors of HIV-1 Reverse Transcriptase Dimerization”. J. Med. Chem. 49 (16): 4834—4841. PMID 16884295. doi:10.1021/jm0604575. 
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Proteinski dimer
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