4ldq

Crystal Structure of the Mediator of Rho Dependent Invasion

spinqualitylabelsall models 4ldq, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ldq is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 4ldr Gene: MRI1, MRDI, UNQ6390/PRO21135 (Homo sapiens) Activity: S-methyl-5-thioribose-1-phosphate isomerase, with EC number 5.3.1.23 Resources: FirstGlance, OCA, RCSB, PDBsum Function [MTNA_HUMAN] Catalyzes the interconversion of methylthioribose-1-phosphate (MTR-1-P) into methylthioribulose-1-phosphate (MTRu-1-P). Independently from catalytic activity, promotes cell invasion in response to constitutive RhoA activation by promoting FAK tyrosine phosphorylation and stress fiber turnover. Publication Abstract from PubMed Metastatic melanoma is among the most intractable cancers to treat, where patients show resistance to therapy and limited survival time. A critical step in the development of metastatic melanoma is the acquisition of invasion and transition from thin to thick tumors on the skin, followed by invasion to lymph nodes. Prior studies have shown that metastatic melanoma is associated with dysregulation of RhoA and enhanced expression of a protein named "mediator of RhoA-dependent invasion (MRDI)". Importantly, MRDI is a "moonlighting" enzyme, with two distinct functions in melanoma cells. First, MRDI acts as a methylthioribose-1-phosphate (MTR-1-P) isomerase, catalyzing a critical step in methionine salvage. Second, MRDI promotes and is necessary for melanoma cell invasion, independent of its catalytic activity. Here, we demonstrate that MtnA, a bacterial MTR-1-P isomerase, rescues the methionine salvage function of MRDI, but is unable to rescue its role in invasion. We then solve the crystal structure of MRDI to a resolution of 2.5 A, in order to identify structural elements important for its invasion activity. We present this structure and its comparison with other MTR-1-P isomerases, and identify mutations within a region separate from the MTR-1-P binding site which interfere with invasion. Thus, structural elements in MRDI distal from the MTR-1-P catalytic site are responsible for the invasion phenotype. Structure of MRDI Explains its Dual Function as a Metabolic Enzyme and a Mediator of Cell Invasion.,Templeton PD, Litman ES, Metzner SI, Ahn NG, Sousa MC Biochemistry. 2013 Jul 16. PMID:23859498 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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