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1h27, resolution 2.20Å ()
Non-Standard Residues:
Related: 1aq1, 1b38, 1b39, 1buh, 1ckp, 1di8, 1dm2, 1e1v, 1e1x, 1e9h, 1f5q, 1fin, 1fq1, 1fvt, 1fvv, 1g5s, 1gih, 1gii, 1gij, 1gy3, 1gz8, 1h00, 1h01, 1h06, 1h07, 1h08, 1h0u, 1h0v, 1h0w, 1h1p, 1h1q, 1h1r, 1h1s, 1h24, 1h25, 1h26, 1h28, 1hck, 1hcl, 1jst, 1jsu, 1jsv, 1jvp, 1ke5, 1ke6, 1ke7, 1ke8, 1ke9, 1qmz
Resources: FirstGlance, OCA, RCSB, PDBsum
Coordinates: save as pdb, mmCIF, xml



Publication Abstract from PubMed

Progression through S phase of the eukaryotic cell cycle is regulated by the action of the cyclin dependent protein kinase 2 (CDK2) in association with cyclin A. CDK2/cyclin A phosphorylates numerous substrates. Substrate specificity often employs a dual recognition strategy in which the sequence flanking the phospho-acceptor site (Ser.Pro.X.Arg/Lys) is recognized by CDK2, while the cyclin A component of the complex contains a hydrophobic site that binds Arg/Lys.X.Leu ("RXL" or "KXL") substrate recruitment motifs. To determine additional sequence specificity motifs around the RXL sequence, we have performed X-ray crystallographic studies at 2.3 A resolution and isothermal calorimetry measurements on complexes of phospho-CDK2/cyclin A with a recruitment peptide derived from E2F1 and with shorter 11-mer peptides from p53, pRb, p27, E2F1, and p107. The results show that the cyclin recruitment site accommodates a second hydrophobic residue either immediately C-terminal or next adjacent to the leucine of the "RXL" motif and that this site makes important contributions to the recruitment peptide recognition. The arginine of the RXL motif contacts a glutamate, Glu220, on the cyclin. In those substrates that contain a KXL motif, no ionic interactions are observed with the lysine. The sequences N-terminal to the "RXL" motif of the individual peptides show no conservation, but nevertheless make common contacts to the cyclin through main chain interactions. Thus, the recruitment site is able to recognize diverse but conformationally constrained target sequences. The observations have implications for the further identification of physiological substrates of CDK2/cyclin A and the design of specific inhibitors.

Specificity determinants of recruitment peptides bound to phospho-CDK2/cyclin A., Lowe ED, Tews I, Cheng KY, Brown NR, Gul S, Noble ME, Gamblin SJ, Johnson LN, Biochemistry. 2002 Dec 31;41(52):15625-34. PMID:12501191

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.


[CCNA2_HUMAN] Essential for the control of the cell cycle at the G1/S (start) and the G2/M (mitosis) transitions.

About this Structure

1h27 is a 5 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA.

See Also


  • Lowe ED, Tews I, Cheng KY, Brown NR, Gul S, Noble ME, Gamblin SJ, Johnson LN. Specificity determinants of recruitment peptides bound to phospho-CDK2/cyclin A. Biochemistry. 2002 Dec 31;41(52):15625-34. PMID:12501191
  • Brown NR, Noble ME, Endicott JA, Johnson LN. The structural basis for specificity of substrate and recruitment peptides for cyclin-dependent kinases. Nat Cell Biol. 1999 Nov;1(7):438-43. PMID:10559988 doi:10.1038/15674

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