Search Results

You searched for all publications:

with publication states 'Published (Approved)'

Search Again...

These results only include publications that have been reviewed and processed by Diamond Light Source. To also view papers that have not yet been processed click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

Exact matches
Related results

2 items found (0 items not approved), displaying all items.1

Instruments / Technical Area	Publication Details	Published	Actions
B23-Circular Dichroism	The SH3 domain of HS1 protein recognizes lysine-rich polyproline motifs Guiliano Siligardi , Paolo Ruzza , Rohanah Hussain , Luca Cesaro , Anna Maria Brunati , Lorenzo A. Pinna , Arianna Donella-Deana Amino Acids 42 (4) DOI: 10.1007/s00726-011-0831-4 PMID: 21287358 Diamond Proposal Number(s): [2023] Show Abstract ▼ Abstract: HS1 is a protein involved in erythroid proliferation and apoptotic cell death, containing several structurally significant motifs including a C-terminal SH3 domain. HPK1 is a member of the Ste20-related kinase family, which contains four proline-rich sequences and is constitutively associated with HS1 in hematopoietic cells. Recombinant fusion protein GST-SH3HS1 was expressed to assess the binding properties of 16 peptides derived from the HPK1 proline-rich regions. The binding affinities were determined by non-immobilized ligand interaction assay by circular dichroism. Our results revealed that the classical PxxPxK class II binding motif is not sufficient to induce the interaction with the GST-SH3HS1 domain, an event dependent on the presence of additional basic residue(s) located at the C-terminus of the PxxPxK motif: Lys?5 in P2 peptide and Lys?8 in P4c peptide. Lys replacement by Arg residues decreases the ligand binding affinity. The finding that both SH3HS1 domain and full-length HS1 protein bind to P2 peptide with similar affinity demonstrates that the whole protein sequence does not affect the interaction properties of the domain. In silico models of SH3HS1 as a complex with P2 or P4c highlight the domain residues that interact with the recognition determinants of the peptide ligand and that cooperate in the complex stabilization.	Feb 2011
	4-Fluoroproline derivative peptides: effect on PPII conformation and SH3 affinity Paolo Ruzza , Giuliano Siligardi , Arianna Donella-Deana , Andrea Calderan , Rohanah Hussain , Chiara Rubini , Luca Cesaro , Alessio Osler , Andrea Guiotto , Lorenzo A. Pinna , Gianfranco Borin Journal Of Peptide Science 12 (7), 462-471 DOI: 10.1002/psc.750 PMID: 16506148 Show Abstract ▼ Abstract: Eukaryotic signal transduction involves the assembly of transient protein–protein complexes mediated by modular interaction domains. Specific Pro-rich sequences with the consensus core motif PxxP adopt the PPII helix conformation upon binding to SH3 domains. For short Pro-rich peptides, little or no ordered secondary structure is usually observed before binding interactions. The association of a Pro-rich peptide with the SH3 domain involves unfavorable binding entropy due to the loss of rotational freedom on forming the PPII helix. With the aim of stabilizing the PPII helix conformation in the Pro-rich HPK1 decapeptide PPPLPPKPKF (P2), a series of P2 analogues was prepared, in which specific Pro positions were alternatively occupied by 4(S)- or 4(R)-4-fluoro-L-proline. The interactions of these peptides with the SH3 domain of the HPK1-binding partner HS1 were quantitatively analyzed by the NILIA-CD approach. A CD thermal analysis of the P2 analogues was performed to assess their propensity to adopt the PPII helix conformation. Contrary to our expectations, the Kd values of the analogues were lower than that of the parent peptide P2. These results clearly show that the induction of a stable PPII helix conformation in short Pro-rich peptides is not sufficient to increase their affinity toward the SH3 domain and that the effect of 4-fluoroproline strongly depends on the position of this residue in the sequence and the chirality of the substituent in the pyrrolidine ring.	Jul 2006

Publications Database

Search Results

You searched for all publications:

Search Again...

Subject Areas (check all that apply) select all

Instruments used to collect data (check all that apply) select all

Collaborations involved (check all that apply) select all

Diamond Offline Facilities used

Relevant Technical Areas (check all that apply) select all

Menu for Anonymous User