This entry contains a number of protein families with apparently unrelated functions. These include the YAP binding proteins of yeasts. These are stress response and redox homeostasis proteins, induced by hydrogen peroxide or induced in response to alkylating agent methyl methanesulphonate (MMS) [1] [2]. The family includes Aberrant root formation protein 4 (Alf4) of Arabidopsis thaliana (Mouse-ear cress), which is required for the initiation of lateral roots independent from auxin signalling. It may also function in maintaining the pericycle in the mitotically competent state needed for lateral root formation [3]. The family includes glomulin (FAP68), which is essential for normal development of the vasculature and may represent a naturally occurring ligand of the immunophilins FKBP59 and FKBP12 [4] [5].

1: Ybp1 is required for the hydrogen peroxide-induced oxidation of the Yap1 transcription factor. Veal EA, Ross SJ, Malakasi P, Peacock E, Morgan BA; J Biol Chem. 2003;278:30896-30904. PMID:12743123

2: Global response of Saccharomyces cerevisiae to an alkylating agent. Jelinsky SA, Samson LD; Proc Natl Acad Sci U S A. 1999;96:1486-1491. PMID:9990050

3: Arabidopsis ALF4 encodes a nuclear-localized protein required for lateral root formation. DiDonato RJ, Arbuckle E, Buker S, Sheets J, Tobar J, Totong R, Grisafi P, Fink GR, Celenza JL; Plant J. 2004;37:340-353. PMID:14731255

4: Ligand-regulated binding of FAP68 to the hepatocyte growth factor receptor. Grisendi S, Chambraud B, Gout I, Comoglio PM, Crepaldi T; J Biol Chem. 2001;276:46632-46638. PMID:11571281

5: The FKBP-associated protein FAP48 is an antiproliferative molecule and a player in T cell activation that increases IL2 synthesis. Krummrei U, Baulieu EE, Chambraud B; Proc Natl Acad Sci U S A. 2003;100:2444-2449. PMID:12604780