PTPRC

Protein tyrosine phosphatase, receptor type, C
PDB rendering based on 1ygr.
Available structures PDB Ortholog search: PDBe, RCSB List of PDB id codes 1YGR, 1YGU
Identifiers
Symbols	PTPRC ; B220; CD45; CD45R; GP180; L-CA; LCA; LY5; T200
External IDs	OMIM: 151460 MGI: 97810 HomoloGene: 2126 ChEMBL: 3243 GeneCards: PTPRC Gene
EC number	3.1.3.48
Gene ontology Molecular function • protein tyrosine phosphatase activity • transmembrane receptor protein tyrosine phosphatase activity • protein binding • protein kinase binding Cellular component • intracellular • plasma membrane • integral component of plasma membrane • focal adhesion • external side of plasma membrane • cell surface • membrane • membrane raft • extracellular exosome Biological process • negative regulation of T cell mediated cytotoxicity • negative regulation of cytokine-mediated signaling pathway • hematopoietic progenitor cell differentiation • immunoglobulin biosynthetic process • negative regulation of protein kinase activity • protein dephosphorylation • negative regulation of cell adhesion involved in substrate-bound cell migration • cell surface receptor signaling pathway • axon guidance • dephosphorylation • T cell differentiation • positive regulation of B cell proliferation • peptidyl-tyrosine dephosphorylation • B cell proliferation • positive regulation of T cell proliferation • cell cycle phase transition • positive regulation of protein kinase activity • bone marrow development • stem cell development • T cell receptor signaling pathway • B cell receptor signaling pathway • positive regulation of antigen receptor-mediated signaling pathway • release of sequestered calcium ion into cytosol • defense response to virus • regulation of cell cycle • positive regulation of hematopoietic stem cell migration • positive regulation of stem cell proliferation Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	5788	19264
Ensembl	ENSG00000081237	ENSMUSG00000026395
UniProt	P08575	P06800
RefSeq (mRNA)	NM_001267798	NM_001111316
RefSeq (protein)	NP_001254727	NP_001104786
Location (UCSC)	Chr 1: 198.64 – 198.76 Mb	Chr 1: 138.06 – 138.18 Mb
PubMed search	[1]	[2]

Protein tyrosine phosphatase, receptor type, C also known as PTPRC is an enzyme that, in humans, is encoded by the PTPRC gene. PTPRC is also known as CD45 antigen (CD stands for cluster of differentiation), which was originally called leukocyte common antigen (LCA).

Function

The protein encoded by this gene is a member of the protein tyrosine phosphatase (PTP) family. PTPs are known to be signaling molecules that regulate a variety of cellular processes including cell growth, differentiation, mitotic cycle, and oncogenic transformation. This PTP contains an extracellular domain, a single transmembrane segment and two tandem intracytoplasmic catalytic domains, and thus belongs to receptor type PTP. This gene is specifically expressed in hematopoietic cells. This PTP has been shown to be an essential regulator of T- and B-cell antigen receptor signaling. It functions through either direct interaction with components of the antigen receptor complexes or by activating various Src family kinases required for the antigen receptor signaling. This PTP also suppresses JAK kinases, and, thus, functions as a negative regulator of cytokine receptor signaling. Four alternatively spliced transcripts variants of this gene, which encode distinct isoforms, have been reported.

It is a type I transmembrane protein that is in various forms present on all differentiated hematopoietic cells, except erythrocytes and plasma cells, that assists in the activation of those cells (a form of co-stimulation). It is expressed in lymphomas, B-cell chronic lymphocytic leukemia, hairy cell leukemia, and acute nonlymphocytic leukemia. A monoclonal antibody to CD45 is used in routine immunohistochemistry to differentiate between histological sections from lymphomas and carcinomas.

Isoforms

The CD45 family consists of multiple members that are all products of a single complex gene. This gene contains 34 exons and three exons of the primary transcripts are alternatively spliced to generate up to eight different mature mRNAs and after translation eight different protein products. These three exons generate the RA, RB and RC isoforms.

Various isoforms of CD45 exist: CD45RA, CD45RB, CD45RC, CD45RAB, CD45RAC, CD45RBC, CD45RO, CD45R (ABC). CD45RA is located on naive T cells and CD45RO is located on memory T cells. CD45 is also highly glycosylated. CD45R is the longest protein and migrates at 200 kDa when isolated from T cells. B cells also express CD45R with heavier glycosylation, bringing the molecular weight to 220 kDa, hence the name B220; B cell isoform of 220 kDa. B220 expression is not restricted to B cells and can also be expressed on activated T cells, on a subset of dendritic cells and other antigen-presenting cells.

Naive T lymphocytes express large CD45 isoforms and are usually positive for CD45RA. Activated and memory T lymphocytes express the shortest CD45 isoform, CD45RO, which lacks RA, RB, and RC exons. This shortest isoform facilitates T cell activation.

The cytoplasmic domain of CD45 is one of the largest known and it has an intrinsic phosphatase activity that removes an inhibitory phosphate group on a tyrosine kinase called Lck (in T cells) or Lyn/Fyn/Lck (in B cells) and activates it.

Interactions

PTPRC has been shown to interact with:

• GANAB,
• LYN,
• Lck, and
• SKAP1.

CD45 has been recently shown to interact with the HCMV UL11 protein. This interaction results in functional paralysis of T cells.

Clinical importance

Stem cells of several varieties, including mesenchymal stem cells and hæmatopoietic stem cells are found in the bone marrow. If a clinician wishes to separate the two, the CD45 marker is used to distinguish the two stem cell types, as CD45 is found on all leukocytes.

Use as a congenic marker

There are two identifiable alleles of CD45 in mice: CD45.1 (Ly5.1 historically) and CD45.2 (Ly5.2 historically). These two types of CD45 are believed to be functionally identical. As such, they are routinely used in scientific research to allow identification of cells. For instance, leukocytes can be transferred from a CD45.1 donor mouse, into a CD45.2 host mouse, and can be subsequently identified due to their expression of CD45.1. This technique is also routinely used when generating chimeras. An alternative system is the use of CD90 (Thy1) alleles. The CD90.1/CD90.2 system is used in the same manner as the CD45.1/CD45.2 system.