replace first string before first space

how to replace first string before first space.

NC_009925.1_13653 [754389 - 754574] Acaryochloris marina ATTCCTGATTCTCTTGATGAAAGTAACATTATGGATCAT... TATGATCCATTCAGGCATGATGCAAGGCGCTACCCCCAA... 110311 2992101 2992319 len=219 TTGGAGAAAACTTATTTTTTAAATACTACGAAAAAAAGG... TCTGATTTAATGCAAGAACTGAGGACTTTTTCGGGTGTA... orf_6409 (gi|158333233|ref|NC_009925.1| Acaryochloris marina GTGAAATCCTTCAGAAAGCGGCTAAATGAATCATTGTCA... GCGATTTATCAGGCAGCTAATGACCAGTCTGGTAAGCTA...

the expected outcome is

NC_009925 [754389 - 754574] Acaryochloris marina MBIC11017 ATTCCTGATTCTCTTGATGAAAGTAACATTATGGATCAT... TATGATCCATTCAGGCATGATGCAAGGCGCTACCCCCAA... NC_009925 2992101 2992319 len=219 TTGGAGAAAACTTATTTTTTAAATACTACGAAAAAAAGG... TCTGATTTAATGCAAGAACTGAGGACTTTTTCGGGTGTA... NC_009925 (gi|158333233|ref|NC_009925.1| Acaryochloris marina MBIC11017 chromosome GTGAAATCCTTCAGAAAGCGGCTAAATGAATCATTGTCA... GCGATTTATCAGGCAGCTAATGACCAGTCTGGTAAGCTA..