1ewi
From Proteopedia
HUMAN REPLICATION PROTEIN A: GLOBAL FOLD OF THE N-TERMINAL RPA-70 DOMAIN REVEALS A BASIC CLEFT AND FLEXIBLE C-TERMINAL LINKER
Structural highlights
Function[RFA1_HUMAN] Plays an essential role in several cellular processes in DNA metabolism including replication, recombination and DNA repair. Binds and subsequently stabilizes single-stranded DNA intermediates and thus prevents complementary DNA from reannealing.[1] [2] Functions as component of the alternative replication protein A complex (aRPA). aRPA binds single-stranded DNA and probably plays a role in DNA repair; it does not support chromosomal DNA replication and cell cycle progression through S-phase. In vitro, aRPA cannot promote efficient priming by DNA polymerase alpha but supports DNA polymerase delta synthesis in the presence of PCNA and replication factor C (RFC), the dual incision/excision reaction of nucleotide excision repair and RAD51-dependent strand exchange.[3] [4] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedHuman Replication Protein A (hsRPA) is required for multiple cellular processes in DNA metabolism including DNA repair, replication and recombination. It binds single-stranded DNA with high affinity and interacts specifically with multiple proteins. hsRPA forms a heterotrimeric complex composed of 70-, 32- and 14-kDa subunits (henceforth RPA70, RPA32, and RPA14). The N-terminal 168 residues of RPA70 form a structurally distinct domain that stimulates DNA polymerase alpha activity, interacts with several transcriptional activators including tumor suppressor p53, and during the cell cycle it signals escape from the DNA damage induced G2/M checkpoint. We have solved the global fold of the fragment corresponding to this domain (RPA70 delta 169) and we find residues 8-108 of the N-terminal domain are structured. The remaining C-terminal residues are unstructured and may form a flexible linker to the DNA-binding domain of RPA70. The globular region forms a five-stranded anti-parallel beta-barrel. The ends of the barrel are capped by short helices. Two loops on one side of the barrel form a large basic cleft which is a likely site for binding the acidic motifs of transcriptional activators. Many lethal or conditional lethal yeast point mutants map to this cleft, whereas no mutations with severe phenotype have been found in the linker region. Human replication protein A: global fold of the N-terminal RPA-70 domain reveals a basic cleft and flexible C-terminal linker.,Jacobs DM, Lipton AS, Isern NG, Daughdrill GW, Lowry DF, Gomes X, Wold MS J Biomol NMR. 1999 Aug;14(4):321-31. PMID:10526407[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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