P38 Delta/MAPK13 Protein Overview: Sequence, Structure, Function and Protein Interaction

P38 Delta/MAPK13 Protein Overview

Mitogen-activated protein kinase (MAPK) cascades represent one of the major signal systems used by eukaryotic cells to transduce extracellular signals into cellular responses. The stress-activated protein kinases (SAPKs; see 601335) are MAPKs that are activated by chemical and environmental stresses as well as by proinflammatory cytokines. By screening a pituitary gland library with a partial SAPK2b (p38-beta; 602898) cDNA, Goedert et al. (1997) isolated cDNAs encoding a protein that they designated SAPK4. The sequence of the predicted 365-amino acid protein is approximately 60% identical to those of SAPK3 (p38-gamma; 602399), SAPK2a (p38; 600289), and SAPK2b. Like those SAPKs, SAPK4 has a TGY dual phosphorylation motif and is activated in response to cellular stresses and proinflammatory cytokines. MKK6 (601254) was found to be the major upstream activator of SAPK4. Goedert et al. (1997) reported that the substrate specificity of SAPK4 in vitro was similar to that of SAPK3. Northern blot analysis revealed that SAPK4 is expressed as a 2.3-kb transcript in a variety of tissues. Kumar et al. (1997) and Wang et al. (1997) also isolated SAPK4 cDNAs. Using Northern blot analysis, Wang et al. (1997) compared the expression patterns of SAPK4 (designated p38-delta by them), SAPK2a, SAPK2b, and SAPK3 in 50 human tissues. They detected 2 SAPK4 transcripts: a predominant 1.8-kb mRNA and a lower abundance 6-kb mRNA. The highest levels of expression were observed in exocrine/endocrine tissues including salivary gland, pituitary gland, adrenal gland and placenta. Wang et al. (1997) determined that mutagenesis of the threonine and tyrosine residues in the TGY motif abolished the kinase activity of SAPK4 and blocked activation by UV light or MKK6. Thus, like other MAPKs, SAPK4 requires phosphorylation at either or both of these residues for activation.

P38 Delta/MAPK13 protein family

Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. MAP kinase subfamily.

P38 Delta/MAPK13 protein name

Recommended name
Mitogen-activated protein kinase 13
Short name
MAP kinase 13||MAPK 13||MAP kinase p38 delta
p38delta, SAPK4
Alternative name
Mitogen-activated protein kinase p38 delta Stress-activated protein kinase 4

P38 Delta/MAPK13 Gene family protein

P38 Delta/MAPK13 Protein Sequence

Species Human P38 Delta/MAPK13 protein
Length 365
Mass (Da) 42090
Sequence Human P38 Delta/MAPK13 protein sequence
Species Mouse P38 Delta/MAPK13 protein
Length 366
Mass (Da) 42072
Sequence Mouse P38 Delta/MAPK13 protein sequence
Species Rat P38 Delta/MAPK13 protein
Length 366
Mass (Da) 42051
Sequence Rat P38 Delta/MAPK13 protein sequence

P38 Delta/MAPK13 Protein Molecular Weight & PI

Mitogen-activated protein kinase 13 (EC (MAP kinase 13) (MAPK 13) (Mitogen-activated protein kinase p38 delta) (MAP kinase p38 delta) (Stress-activated protein kinase 4) Homo sapiens (Human).

The parameters have been computed for the following feature

FT CHAIN 1-365 Mitogen-activated protein kinase 13.

Molecular weight (Da)


Theoretical pI


P38 Delta/MAPK13 Protein Structure

MAPK13, active form
2013-09-27   Released:  2015-03-25
Deposition Author(s)
Yurtsever, Z., Brett, T.J., Scheaffer, S.M.
Homo sapiens
Expression System
Escherichia coli BL21(DE3)
Experimental Data Snapshot
2.5940 Å
R-Value Free
R-Value Work

Human P38 Delta/MAPK13 protein Secondary structure

P38 Delta/MAPK13 Protein Interaction

Recombinant P38 Delta/MAPK13 Protein Feature

P38 Delta/MAPK13 Protein, Human, Recombinant (GST Tag), Activated in vitro

High Purity
> 90 % as determined by SDS-PAGE
Low Endotoxin
< 1.0 EU per μg of the protein as determined by the LAL method
High Activity
The specific activity was determined to be >30 nmol/min/mg using MBP as substrate.

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