1QA9

Structure of a Heterophilic Adhesion Complex Between the Human CD2 and CD58(LFA-3) Counter-Receptors

Summary for 1QA9

• Entry DOI: 10.2210/pdb1qa9/pdb
• Descriptor: HUMAN CD2 PROTEIN, HUMAN CD58 PROTEIN (2 entities in total)
• Functional Keywords: cell adhesion, ig-like domain, cd2, cd58, immune system
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 4
• Total formula weight: 46041.67

Authors

Wang, J.-H.,Smolyar, A.,Tan, K.,Liu, J.-H.,Kim, M.,Sun, Z.J.,Wagner, G.,Reinherz, E.L. (deposition date: 1999-04-13, release date: 1999-04-29, Last modification date: 2024-02-14)

Primary citation

Wang, J.H.,Smolyar, A.,Tan, K.,Liu, J.H.,Kim, M.,Sun, Z.Y.,Wagner, G.,Reinherz, E.L.
Structure of a heterophilic adhesion complex between the human CD2 and CD58 (LFA-3) counterreceptors.
Cell(Cambridge,Mass.), 97:791-803, 1999

PubMed Abstract: Interaction between CD2 and its counterreceptor, CD58 (LFA-3), on opposing cells optimizes immune recognition, facilitating contacts between helper T lymphocytes and antigen-presenting cells as well as between cytolytic effectors and target cells. Here, we report the crystal structure of the heterophilic adhesion complex between the amino-terminal domains of human CD2 and CD58. A strikingly asymmetric, orthogonal, face-to-face interaction involving the major beta sheets of the respective immunoglobulin-like domains with poor shape complementarity is revealed. In the virtual absence of hydrophobic forces, interdigitating charged amino acid side chains form hydrogen bonds and salt links at the interface (approximately 1200 A2), imparting a high degree of specificity albeit with low affinity (K(D) of approximately microM). These features explain CD2-CD58 dynamic binding, offering insights into interactions of related immunoglobulin superfamily receptors.

PubMed: 10380930
DOI: 10.1016/S0092-8674(00)80790-4

Experimental method

X-RAY DIFFRACTION (3.2 Å)