Off topic:trouble with GRanges

Question

[Chironex]

I have this GRange list. I would to make some manipulation:

GRanges object with 1498791 ranges and 0 metadata columns:
                                                                                                                              seqnames
                                                                                                                                 <Rle>
        [1] KQ415657.1  isolate UCB-OBI-ISO-001 unplaced genomic scaffold Scaffold5, whole genome shotgun sequence
        [2] KQ415657.1 isolate UCB-OBI-ISO-001 unplaced genomic scaffold Scaffold5, whole genome shotgun sequence
        [3] KQ415657.1  isolate UCB-OBI-ISO-001 unplaced genomic scaffold Scaffold5, whole genome shotgun sequence


               ranges strand
            <IRanges>  <Rle>
        [1]   303-309      *
        [2] 1741-1747      *
        [3] 1972-1978      *

I would rename the strings, and also create columns with start and and, and also define the strand. I would have a result like this but I don't know how to change the names of seqnames

       GRanges object with 1498791 ranges and 0 metadata columns:
  seqnames                            ranges           strand
                                      start   end                                                                                                    
 [1] KQ415657.1                       303     309         +
 [2] KQ415657.1                       1741    1747        +
 [3] KQ415657.1                       1972    1978        +

could you help me?