Human Yip1A specifies the localization of Yif1 to the Golgi apparatus.
Yip1p and Yif1p are essential for transport from ER to Golgi stack during the early secretory pathway in budding yeast. Here, we report the identification and characterization of human Yif1. Sequence analysis revealed that human Yif1 (HsYif1), like most of the other YIP1 protein family members, contains multiple transmembrane segments. Double immunofluorescence study revealed co-distribution of HsYif1 with Golgi marker such as GS27. To delineate the function of HsYif1, we conducted a yeast two-hybrid assay and identified an interaction between human HsYif1 and HsYip1A, a homolog of yeast Yip1. In addition, our immunoprecipitation pull-down assay validates the interaction between HsYif1 and HsYip1A. Moreover, our immunofluorescence study demonstrates the co-distribution of HsYif1 and HsYip1A. Significantly, over-expression of mutant HsYip1A-lacked cytosolic region disrupts the localization of HsYif1 to the Golgi, suggesting that HsYip1A specifies the localization of HsYif1 to the Golgi. Therefore, we conclude that human Yip1A interacts with and determines the localization of HsYif1 to the Golgi apparatus.
Laboratory of Cell Dynamics, University of Science and Technology of China, Hefei 230027, China.
Changjiang
C
Jin
Yang
Y
Zhang
Hongling
H
Zhu
Kashif
K
Ahmed
Chuanhai
C
Fu
Xuebiao
X
Yao
D000595:Amino Acid Sequence; D002460:Cell Line; D004721:Endoplasmic Reticulum / Q000378:metabolism*; D006056:Golgi Apparatus / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D007668:Kidney / Q000378:metabolism*; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism*; D008969:Molecular Sequence Data; D021381:Protein Transport / Q000502:physiology*; D033921:Vesicular Transport Proteins
D008565:Membrane Proteins; D033921:Vesicular Transport Proteins; C503565:YIF1A protein, human; C502736:YIPF5 protein, human