1) number of potential LEUCINE ZIPPERS: 1

1---------11--------21--------31--------41--------51--------
MVVVAAAPNPADGTPKVLLLSGQPASAAGAPAGQALPLMVPAQRGASPEAASGGLPQARK
                                                            
                                                            
                                                            

61--------71--------81--------91--------101-------111-------
RQRLTHLSPEEKALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENQKLLLENQLLR
             CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
                                     L------L------L------L-
                                     LZLZLZLZLZLZLZLZLZLZLZL

121-------131-------141-------151-------161-------171-------
EKTHGLVVENQELRQRLGMDALVAEEEAEAKGNEVRPVAGSAESAALRLRAPLQQVQAQL
CCCCCCCCCCCCCCCC                                            
-----L------L                                               
ZLZLZLZLZLZLZ                                               

181-------191-------201-------211-------221-------231-------
SPLQNISPWILAVLTLQIQSLISCWAFWTTWTQSCSSNALPQSLPAWRSSQRSTQKDPVP
                                                            
                                                            
                                                            

241-------251-------261
YQPPFLCQWGRHQPSWKPLMN
                     
                    
COILED COILS which do NOT correspond to a Leucine Zipper => none
LEUCINE REPEATS which do NOT correspond to a Leucine Zipper => none


2) >sp|P17861|XBP1_HUMAN X-box-binding protein 1 OS=Homo sapiens GN=XBP1 PE=2 SV=2
MVVVAAAPNPADGTPKVLLLSGQPASAAGAPAGQALPLMVPAQRGASPEAASGGLPQARK
RQRLTHLSPEEKALRRKLKNRVAAQTARDRKKARMSELEQQVVDLEEENQKLLLENQLLR
EKTHGLVVENQELRQRLGMDALVAEEEAEAKGNEVRPVAGSAESAALRLRAPLQQVQAQL
SPLQNISPWILAVLTLQIQSLISCWAFWTTWTQSCSSNALPQSLPAWRSSQRSTQKDPVP
YQPPFLCQWGRHQPSWKPLMN

3) 1FOS.pdb