2JP1

Solution structure of the alternative conformation of XCL1/Lymphotactin

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Interconversion between two unrelated protein folds in the lymphotactin native state

Tuinstra, R.L., Peterson, F.C., Kutlesa, S., Elgin, E.S., Kron, M.A., Volkman, B.F.

(2008) Proc.Natl.Acad.Sci.Usa 105: 5057-5062

  • DOI: 10.1073/pnas.0709518105

  • PubMed Abstract: 

    • Proteins often have multiple functional states, which might not always be accommodated by a single fold. Lymphotactin (Ltn) adopts two distinct structures in equilibrium, one corresponding to the canonical chemokine fold consisting of a monomeric thr ...

    Proteins often have multiple functional states, which might not always be accommodated by a single fold. Lymphotactin (Ltn) adopts two distinct structures in equilibrium, one corresponding to the canonical chemokine fold consisting of a monomeric three-stranded beta-sheet and carboxyl-terminal helix. The second Ltn structure solved by NMR reveals a dimeric all-beta-sheet arrangement with no similarity to other known proteins. In physiological solution conditions, both structures are significantly populated and interconvert rapidly. Interconversion replaces long-range interactions that stabilize the chemokine fold with an entirely new set of tertiary and quaternary contacts. The chemokine-like Ltn conformation is a functional XCR1 agonist, but fails to bind heparin. In contrast, the alternative structure binds glycosaminoglycans with high affinity but fails to activate XCR1. Because each structural species displays only one of the two functional properties essential for activity in vivo, the conformational equilibrium is likely to be essential for the biological activity of lymphotactin. These results demonstrate that the functional repertoire and regulation of a single naturally occurring amino acid sequence can be expanded by access to a set of highly dissimilar native-state structures.

    Organizational Affiliation: 

    Departments of Biochemistry and Medicine and Biotechnology and Bioengineering Center, Medical College of Wisconsin, Milwaukee, WI 53226, USA




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Lymphotactin
A, B
93Homo sapiensMutation(s): 0 
Gene Names: XCL1 (LTN, SCYC1)
Find proteins for P47992 (Homo sapiens)
Go to Gene View: XCL1
Go to UniProtKB:  P47992
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 
  • Olderado: 2JP1 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-03-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance