Heparan sulfate proteoglycans: structure, protein interactions and cell signaling.
Heparan sulfate proteoglycans are ubiquitously found at the cell surface and extracellular matrix in all the animal species. This review will focus on the structural characteristics of the heparan sulfate proteoglycans related to protein interactions leading to cell signaling. The heparan sulfate chains due to their vast structural diversity are able to bind and interact with a wide variety of proteins, such as growth factors, chemokines, morphogens, extracellular matrix components, enzymes, among others. There is a specificity directing the interactions of heparan sulfates and target proteins, regarding both the fine structure of the polysaccharide chain as well precise protein motifs. Heparan sulfates play a role in cellular signaling either as receptor or co-receptor for different ligands, and the activation of downstream pathways is related to phosphorylation of different cytosolic proteins either directly or involving cytoskeleton interactions leading to gene regulation. The role of the heparan sulfate proteoglycans in cellular signaling and endocytic uptake pathways is also discussed.
Dreyfuss
Juliana L
JL
Departamento de Bioquímica, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
Regatieri
Caio V
CV
Jarrouge
Thais R
TR
Cavalheiro
Renan P
RP
Sampaio
Lucia O
LO
Nader
Helena B
HB
D002448:Cell Adhesion / Q000502:physiology; D004705:Endocytosis / Q000502:physiology*; D016326:Extracellular Matrix Proteins / Q000502:physiology*; D019812:Heparan Sulfate Proteoglycans / Q000737:chemistry / Q000502:physiology*; D006801:Humans; D011485:Protein Binding / Q000502:physiology; D015398:Signal Transduction / Q000502:physiology*
D016326:Extracellular Matrix Proteins; D019812:Heparan Sulfate Proteoglycans