5A2E

Extracellular SRCR domains of human CD6

Summary for 5A2E

• Entry DOI: 10.2210/pdb5a2e/pdb
• Related: 5A2F
• Descriptor: T-CELL DIFFERENTIATION ANTIGEN CD6, 2-acetamido-2-deoxy-beta-D-glucopyranose, 1,2-ETHANEDIOL, ... (4 entities in total)
• Functional Keywords: immune system, scavenger receptor cysteine rich, srcr
• Biological source: HOMO SAPIENS (HUMAN)
• Total number of polymer chains: 1
• Total formula weight: 40206.78

Authors

Chappell, P.E.,Johnson, S.,Lea, S.M.,Brown, M.H. (deposition date: 2015-05-18, release date: 2015-07-22, Last modification date: 2024-11-13)

Primary citation

Chappell, P.E.,Garner, L.I.,Yan, J.,Metcalfe, C.,Hatherley, D.,Johnson, S.,Robinson, C.V.,Lea, S.M.,Brown, M.H.
Structures of Cd6 and its Ligand Cd166 Give Insight Into Their Interaction.
Structure, 23:1426-, 2015

PubMed Abstract: CD6 is a transmembrane protein with an extracellular region containing three scavenger receptor cysteine rich (SRCR) domains. The membrane proximal domain of CD6 binds the N-terminal immunoglobulin superfamily (IgSF) domain of another cell surface receptor, CD166, which also engages in homophilic interactions. CD6 expression is mainly restricted to T cells, and the interaction between CD6 and CD166 regulates T-cell activation. We have solved the X-ray crystal structures of the three SRCR domains of CD6 and two N-terminal domains of CD166. This first structure of consecutive SRCR domains reveals a nonlinear organization. We characterized the binding sites on CD6 and CD166 and showed that a SNP in CD6 causes glycosylation that hinders the CD6/CD166 interaction. Native mass spectrometry analysis showed that there is competition between the heterophilic and homophilic interactions. These data give insight into how interactions of consecutive SRCR domains are perturbed by SNPs and potential therapeutic reagents.

PubMed: 26146185
DOI: 10.1016/J.STR.2015.05.019

Experimental method

X-RAY DIFFRACTION (3.15 Å)